302 with gt40p heads horsepower 302 with gt40p heads horsepower

how much HP and torque? Always the weak area in the 289 and 302 is the tiny 5/16 inch connecting rod bolts and the miniscule intake and exhaust ports. I've got gt40p heads for it I'll be running, and can't afford better . GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . With no other changes we gained 25 hp using factory iron heads. And remember ENGINES have been being built/rebuilt/modified for years. But the part about a cam replacement possibly being a labor intensive undertaking is correct. This is needed for the steel roller cam. Step 1. Im now thinking of adding a cam to match the carb. We compare the GT40s to modern cylinder heads as well as other heads from the era. Assorted screwdrivers, pliers and vise-grips. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. Holley 670 street avenger carb. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. It runs smooth but seems lazy. . Purchase a set of flat top pistons (from Ford Motorsport, TRW or Keith Black) with machined valve reliefs and designed to provide 10:1 compression with a 59 to 60 cc combustion chamber cylinder head. If there isnt room without disassembling half the front clip on the car, then it might be easier to remove the engine and do the conversion that way. For real performance, stock E7TE heads leave a lot to be desired. SBF engines are modified constantly. I spin it to 6500 and thats about it. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. For additional insurance, we also added a set of ARP head studs, which are stronger and offer better thread overlap than factory bolts, which helps prevent pulling threads out of a used block. For the most part 302 heads and 351W heads are the same. the engine is carburated of that makes a difference. 97% Positive Feedback . If you're running a stock cam, 1.7 rockers will work perfectly. Well offer one as an example. Just got through porting one of my gt40p heads today. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. #1:::Throw out all your Magazines that suggest what to do! I have managed to get 402 horse power from a 289 hipo natural aspirated. Compare. An aggressive cam will wake it up a bit. Rowe studied engineering, philosophy and American literature at Central Florida Community College. With nitrous, this is easily a mid-11-second ride. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. The best thing to do would be to use a specific break-in oil for the first 200 to 300 miles of use to reduce the change of a potential problem with undue wear. You could run a thinner head gasket as well. This will cost additional money but is still worth it, in our opinion. Some ideas never go out of style. HAD '82 GT monochromatic (red).black cloth HAVE $930.00 + $55.00 shipping. . It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. The Fora platform includes forum software by XenForo. Best of all, no machining is required to install these on your stock cast iron heads! Really hurt too. 1 - 7 of 7 Posts. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Car Craft mag. I added a link to it. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. Ford Factory 5.0 Performance Cylinder Heads. FULL DYNO RESULTS. Nudge us with emails, and we'll make it happen. You can have your current 28 oz rebalanced to 50. just curious. What would be the best cam and springs to use for these heads in a 302 Windsor? Part of this reason is due to its inherent strength and simplicity, but a lot of it has to do with how little Ford has changed it over the years. Finding Gt40p heads at the junkyard is getting more and more complicated and if you want to upgrade the heads you have to take into account the costs of the machine shop and compare everything to a set of cheap aluminum heads. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. 68stang351 Founding Member May 16, 2002 850 The 5.0L with the GT40 head had a 9.0:1 compression, and the 5.0L with the GT40P head had 9.1:1 compression. Along with the heads, we used MAC headers for GT-40P heads. We bolted the Ford to the dyno with a set of 158-inch long-tube headers and an 18-inch collector extension to help the low-speed torque, then we fired up the small-block. They almost seem like flywheel numbers rather than RWHP numbers. Runs well. For 2018, the Coyote makes 460 hp. These cast piston short-blocks are not quite as good as the forged piston 5.0L that came in Fox-body Mustangs, but the GT40P heads flow much better than earlier 5.0L heads. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) 1.7 shaft rockers and beehives. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. +1 I would go with the regular GT40 heads. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. Took me 7 hours to do one head.but they cleaned up real nice. I think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way. I am working on a set of iron GT40s hoping it goes faster. Even with a stock Mustang 5.0 cam makes good power. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. JavaScript is disabled. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. For this reason, we're not sure what kind of boost the GT-40P heads will give. made more power everytwhere and 40 hp is respectable. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? I am sure you have increased the bore size and possibly even the stroke a bit and spin it up pretty high in the RPM range. We gained 45 hp and 40 lb-ft of torque. Compare. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. These are a great head but do need some machining mods to make they really work well. $169.50. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. Where they differ is the combustion chamber size. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. I just read about this build on the corral.net. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. A trip to Orlando Speed World provided us with updated quarter-mile times. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. You didnt mention which cam you had in mind. You just want to keep it out of detonation. I must agree with Jeff Smith. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). When I purchased my "brand new" set of GT40P's, I bought them from an Mustang specific machine shop that used to exist called Central Coast Mustang. Thanks for the help, I was planning on puttingin roller rockers or at least new springs, and that engine looks great, hoppfully mine will look at least similar to that one of these days. I'm also have the regular GT40 heads on my current build. fordfan289, Aug 27, 2011 With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Now he serves as a regular contributor to OnAllCylinders. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. people can stop saying that adding aftermarket cam with stock heads is a waste of time. For a better experience, please enable JavaScript in your browser before proceeding. In an effort to preserve the history of the Early Fox Era, FEP covers the following vehicles: 79-86 Mustang and Capri, 84-86 Mustang SVO, 78-83 Fairmont & Zephyr, 83-86 LTD & Marquis, 80-88 Thunderbird & Cougar, 82-87 Continental, 84-92 Mark VII, 81-82 Granada. Because its all been done time after time after. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I love my setup and it is very strong engine. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. This time around, we chose a shining example of this junkyard art form. The reply has so many assumptions that I cant even assume to know the answer. THANKS VERY MUCH! I recall having an absolute blast with my old K-code coupe back in the day. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! We started with a 120,000-mile 5.0L out of a Ford Explorer, removed the EFI and DIS, and pocket ported the stock GT40P iron heads with stock valve sizes. A forum community dedicated to Ford performance owners and enthusiasts. Motor is going into a Ranger. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. $700.98. We've already been motivated to put this engine in a buddy's Mustang. It's a classic move we've pulled off many times. I had those on my car before I upgraded and they were nice heads. The reason for this is that we're actually replacing mildly worked E7TE heads. Do you guys have part numbers for the spring kits? The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. In a 3,250-pound car like a Mustang with 3.50 gears and an automatic with a 2,800-rpm converter, this 5.0L could pull 12.80s at 108 mph. Posted on May 07, 2014 by promarengine. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. I was looking at putting on the GT40P heads on. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. Build Thread 1965 Fastback Project "Racesteed". United Engine and Machine sells cheap but decent pistons that will do what you're wanting. I don't need tons of power to enjoy the car. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. Thank You. Step 2. If you dont feel comfortable doing this higher a pro. Nice to see actual dyno results instead of "butt dyno" guesses. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. $700.98. Not looking for crazy HP. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. A COMP hydraulic roller cam we found works well with this combination. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. The action you just performed triggered the security solution. The combination of this cam with your intake and headers will produce a very nice street engine. These are some of the pictures I have showing the Explorer manifolds. The only one that's close, is #7. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Save narve00 This is the main reason why these engines are not modified as much as the small block Chevy. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. All in all, the addition of GT-40P heads to any 5.0 Mustang is a worthwhile venture, especially if you're on a budget (aren't we all) or shooting for the Trophy Stock title. We decided to test both ideas, so we ordered two roller cams from Lunati: a shorter-duration cam that would deliver decent idle vacuum and maybe make around 320 to 335 hp, and a longer-duration version that might push the horsepower up to perhaps 350 hp. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. Through Central Coast you can have the heads fully prepped for your combination. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. So . Thanks. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? #3::: Do your homework,get quality parts,dont skimp. This is a common mistake with first-time cam buyers who dont necessarily appreciate that the cam is just one component of the overall engine package. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. JavaScript is disabled. If I get different urges later, Ill pursue those then. However, theres a distinct possibility that I might pull all of my hair out if I see another in-depth article explaining how I, along with just over a billion other desperate humans seeking answers, need special valve spring split locks for my next tired Chevy build. The "P" heads flow better. If the head bolt holes are 1/2" or slightly larger, ARP makes the washers and can be sourced from Ford Racing or ARP through a speed shop or Summit, Jegs and PAW among others. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 68 Mustang GT/CS Highland Green, PS, PB & Console, C Code w/C4 & 3.55 8 rear, If you aren't using the GT40P's stock, with maybe a spring upgrade and valve job, they aren't worth it anymore. All costing in the end at least another $2k. It took him and yours truly eight hours from start to finish, using air tools and a lift to gain access to the header flanges. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. Here is my setup. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. You didnt provide a lot of information about the engine itself, Im assuming its 85 or newer ( roller cam) May need a freshen up of the bottom end if compression is the issue. I have to agree, the GT40P heads flow better than the GT40 iron heads. A forum community dedicated to Ford Mustang owners and enthusiasts. Take the assembly to a machine shop to have it balanced and install it in the block. Maybe I'll think about a cam swap? Yank a motor out of the junkyard, clean it up, add a camshaft, intake, and a carburetor, and see how much power we can squeeze out of it. Or, you could invest in a new set of heads that would also do the same job but you can expect to spend quite a bit more money. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . But dont think that adding a bigger camshaft will make more power. Since the engine is nearly stock, we would want to choose a relatively mild camshaft with somewhat more lift and duration than stock, but again not going too aggressive. Also, the spark plug angle makes it a pain. Again, assuming this is a nearly stock 5.0L with stock heads, the Weiand Street Warrior dual plane intake and 600 cfm carburetor, its important to not become overly aggressive and choose a big camshaft. I'll save the effort and lighten my front end by 50# with aluminum. There are caveats to this plan, however. Buy the lifters for peace of mind now and hopefully for the duration. However realistically, with the amount of money spent modifying the gt40p heads or even those older 289 & 351w heads, you could have even better performing aluminum heads. Small-block Fords and Mopars only use four head bolts per cylinder, so retaining proper head-gasket sealespecially with nitrousis a point that demands attention, so we ordered a set of Fel-Pro MLS head gaskets rather than a standard, composition gasket. '85 GT vert two tone (white on charcoal)white leather, http://www.facebook.com/groups/233213650060739/, http://www.summitracing.com/parts/TFS-2500100/, ascMcLaren & Motorsport/Grand Prix IV Capris, RHD and Other International/Export Models, Mods, Maintenance & Mechanical FAQs/Archive, If this is your first visit, be sure to Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. The heads that were used were also old C8 casting with 58cc chambers. So I've got the motor and heads already for my maverick project. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. It turned out we were conservative on both counts. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The MPH was there to run a little better but the local track is about terrible. The gt40p head is considered the best OEM 302 head made. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Well also assume that this engine is running stock exhaust manifolds. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Stock heads with a fresh 3-angle valve job, shorty headers, T5, 4.10s, stock Explorer intake and stock '88 GT short block with 140,000 miles on it and an E cam in it. No-option stripper- I like strippers. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Using the manufacturer recommended springs for your camshaft are a safe bet. T5z and 3.89 9" TL rear. I have a 66 mustang with its original untouched 289 with over 140 k on it that Ive been running a blow thru turbo making 14 lbs of boost on for the last 5 years and its never given me a problem. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Here a comparison of different heads on a 302: I'm very happy with my GT40P. 68 XR7 & 68 M-100. I need that part number too! We heated the bottle to 950 psi and hit the button at 4,500 rpm. I'd get the gt40 setup, and put an s trim on it. They work, but present their own challenges. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. This is what I recommend to everyone who is doing a budget 5.0 build. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. Win or lose, if you buy the ticket you must take the ride. Ported Hurricane Single Plane and custom 750 HP. Theres many options available for a little more power. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. Like I said lots of options. Have fun, be safe, enjoy. Their weak point is that the rotator used on the exhaust valve is very thick. No-option stripper- I like strippers. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. HiPo manifolds and Ill be good. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. (A starter is a motor, windshield wipers use a motor,electric windows use motors) Any one uses that terminology in my shop will be corrected once, only once. I'm running stock GT40 heads with stock 4.000 bore on cylinders and a Lunati cam with 256/262; Duration @ .050 (Int/Exh): 213/219; Gross Valve Lift (Int/Exh): .483/.499; LSA/ICL: 112/108. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. A forum community dedicated to Ford Mustang owners and enthusiasts. 69-70 302 heads (the ones with the heart-shaped combustion chamber) Any early 289 heads for the chamber size (but you'll have small ports & valves w/all that CR) Flat Ernie, Aug 27, 2011 SHARE POST #8 fordfan289 Member from indiana correct me if Im wrong but cant you use 351c heads and get the same thing as a 302 boss. Calculated compression to 9.8:1. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. These heads have been remanufactured using refaced reclaimed Factory Valves. Jeff Smith: It would have been better to know a little bit more about your combination, but the short answer is yeswith a hydraulic roller camshaft, assuming the lifters are in good shape and the roller wheels show no unusual wear, they can be re-used on a new cam with no danger of adverse effects. You didnt mention the car this engine is in, but lets assume there is enough room to remove the radiator and any other coolers and perhaps some or all of the front grille and/or brackets before the cam has sufficient room to exit the front of the engine. However, stepping up in the performance head market will set you back more than $1,200 for a decent pair of aluminum castings--and that's straight out of the box, with no porting. Its always refreshing to see a FORD getting a little face time in your column, even if its a tired 302 with no great expectations of setting the world on fire when the dust settles. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. Our recommendation would be, rather than change the camshaft, you might want to look into adding a set of long-tube headers and a dual exhaust if the engine is not already so equipped. at the crank. These are Ford iron GT-40P heads. Good on ya Jeff Smith. 1983 Mustang G.T. Keep in mind that swapping camshafts is a fairly extensive effort. I'm an old school guy (289 in 65 mustang), and I'm just looking into the new 5.0 engine (roller cam) stuff recently. ***Most important is theStupid question is the one that was never asked!*** Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. The spark plug issue is almost a non-issue. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. That's a good combo in my book. For those of you running a carb, or aftermarket intake, you already have a leg up in this area and should see even greater gains in power. This engine will be good for your 65 Mustang. AFR 165cc 58cc Heads. The only failures Ive had were timing chains and a couple broken rods in a mid 80s 302 with 200,000 miles on it that got about 35 lbs of boost stuffed into it when a pop off valve I bought on ebay failed. I wouldnt recommend reusing lifters though. There are too many variables to add to this regarding aftermarket stroker kits or components. You need to check. Slover primarily focused on the exhaust side of the GT40P heads. PTP Engineering front suspension and 25540R17s all around. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. All manufactured using advanced CNC technology for the extreme durability and precision required of the modern canted valve Ford Small Block at power levels around the 1000 mark reached during recent competitions at the EMC and at the strip. He'll have to get a gear for his distributor. In an effort to preserve the history of the Early Fox Era, FEP covers the following vehicles: 79-86 Mustang and Capri, 84-86 Mustang SVO, 78-83 Fairmont & Zephyr, 83-86 LTD & Marquis, 80-88 Thunderbird & Cougar, 82-87 Continental, 84-92 Mark VII, 81-82 Granada. . Actually the regular gt40's in either aluminum or iron are the good ones but the gt40p's are only a slight improvement over regular 302 heads. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. In order to make Coyote-type power you will need some expensive, high-flow cylinder heads with a short block that can withstand spinning in excess of 6,500 rpm. . We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. If you have a early 351W ie pre 76 it probably . I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. that is a healthy budget deal. Over $2050 for the 165/185 renegades. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! K.S. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. This website is using a security service to protect itself from online attacks. 302, GT40P Heads, E cam, 4 into 4, Holley 600, Mallory Unilite, Levy SD T5, 3.73, 15" Team III, firewall mod, trunk mod, trailer hitch, drivers foot box mod, front tow rings. Location: Re: Stock Ford 351W 4bbl dyno numbers. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. The valve seats have been cut on a . But don't think that adding a bigger camshaft will make more power. I got a set of AFR heads , night and day. Shop by category. If they are cheap enough, take them anyway. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. Anythoughts? Finally, we exchanged the Explorer's EFI manifold (which is a pretty good manifold in its own right) for an Edelbrock Performer RPM Air Gap intake and a Holley 750-cfm HP-style carburetor. The results were a major increase in power throughout the entire rev range, with an increase of 60hp at 4500rpm through to a peak of 279hp at 5800rpm. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. i'd love to use these heads,. Free shipping. GT40s have 64cc chambers. While the heads were off getting a massage, we turned our attention to the cam timing. Depends on the budget. They fill that spot between power and budget. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. The reason this new generation of Ford engines make a ton more power is they also enjoy fantastic cylinder heads and four valves per cylinder. With the tuning finalized, the little cam made far more power than we expected, cranking out 328 lb-ft of torque at 4,200 and 294 hp at 5,400 rpm. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. GT40, GT40P, would be great factory heads. Joined . Holten runs the factory fan, but he had removed it when he ran the 12.63. Cloudflare Ray ID: 7a2e2d95dedea1e4 I have a 5.0 from a 1992 Mustang in my 65. In less than an hour, we were ready to test. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. The SUV indicated barely 120,000 on the clock, and after yanking the valve covers to judge the engine's condition, Tim Moore instantly made the decision to do the boneyard version of a smash-and-grab. At the dragstrip, we gained two-tenths and 2 mph. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. (its not their engine) At 4,300 rpm, the torque peaked at 348 lb-ft, a solid 20-lb-ft improvement, and the Lunati continued to outperform the stock cam all the way through with a peak horsepower increase of 60 hp at 354 hp at 5,700 rpm! Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers.