This time around, we chose a shining example of this junkyard art form. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. 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. 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. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. people can stop saying that adding aftermarket cam with stock heads is a waste of time. K.S. Most of the time, GT-40 heads are worth a good 20-40hp over stock 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. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. 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. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. Good on ya Jeff Smith. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. 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. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. They almost seem like flywheel numbers rather than RWHP numbers. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. i know a guy who used to build race engines so he has all the right tools, how much would it help to get the heads ported and polished or anything else he could do to them. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. The reply has so many assumptions that I cant even assume to know the answer. (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. The hardest part of swapping the cam was just getting the timing cover off and back on again. Where they differ is the combustion chamber size. 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. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. 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. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. A forum community dedicated to Ford Mustang owners and enthusiasts. This will cost additional money but is still worth it, in our opinion. Step 2. For the most part 302 heads and 351W heads are the same. JavaScript is disabled. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. The later model distributors had a different diameter shaft than the earlier ones. 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. 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. I turned it because it was tired when I got it. Well assume it is a 5.0L with stock heads. #3::: Do your homework,get quality parts,dont skimp. Not *as* good as the GT40p heads, but I'd prefer to not have to worry about exhaust fitment issues, or have a narrow range of what I can work with. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Ported Hurricane Single Plane and custom 750 HP. We also discovered some issues with the GT40P heads that required changes, so we added valves from Manley that eliminated the exhaust-valve rotators and allowed us to set the proper valvespring installed height. However there are plenty of factory heads that with the help of an experienced machine shop can be great. Compare. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. I just read about this build on the corral.net. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. We took the heads to Mike Slover of Slover's Porting Service in Sun Valley, California, to do this work, plus some basic pocket-porting to improve flowespecially on the exhaust side. 02-11-2012, 07:16 PM #6 fiveoh 86lx Calculated compression to 9.8:1. If you know him, ask him. that is a healthy budget deal. As a matter of fact, Central Coast has an '89 coupe with GT-40P heads that has run a best of 11.98 in the quarter-mile. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. This is a function of the somewhat wider lobe-separation angle of 112 degrees. I've got gt40p heads for it I'll be running, and can't afford better . The Fora platform includes forum software by XenForo. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. In review, we rescued a used 5.0L Ford from the boneyard, ported the heads, added a cam, carburetor, intake manifold, and headers, and pulled an amazing 376 hp out of the mix. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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! Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. Mac and Ford Motorsport both make a GT40P spacific header. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads 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. This is not a criticism but instead consider it to be more of a heads-up. I have a 5.0 from a 1992 Mustang in my 65. Required fields are marked *. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Very true about finding them at the local yards. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. The "P" heads flow better. Just put some 1.7 pedistal rocker arm on along with a mild camshaft (make sure to use the correct valve springs), you will make over 300 flywheel hp. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. These are Ford iron GT-40P heads. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. We heated the bottle to 950 psi and hit the button at 4,500 rpm. Build Thread 1965 Fastback Project "Racesteed". For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. The only one that's close, is #7. I spin it to 6500 and thats about it. made more power everytwhere and 40 hp is respectable. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Those heads were unported and had stock valve sizes! We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. No-option stripper- I like strippers. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. And have discovered something that I dont think anyone else knows. HiPo manifolds and Ill be good. I added a link to it. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? Click to reveal I don't need tons of power to enjoy the car. AFR 165cc 58cc Heads. Generally expect with a good cam, intake, roller rockers and a good ignition system to see around 300-350 max rear wheel horsepower, depending on what type of dyno you use. 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. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. 69.90.139.244 A forum community dedicated to vintage Ford Mustang owners and enthusiasts. Instructions on porting the GT-40p heads here. never messed with the timing, its at 35* total . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. T5 with 3.73s. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. Those are really good numbers. 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. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. The valve seats have been cut on a . Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. GT 500; Posts: 8496; Location: Brisbane . I recall having an absolute blast with my old K-code coupe back in the day. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. 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. 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. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Motor is going into a Ranger. The Fora platform includes forum software by XenForo. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Weiand 7515 xcellerator intake. Now he serves as a regular contributor to OnAllCylinders. Definitely going to use my P heads. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. That's fantastic for the minimal investment we made. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. They also have emissions legal heads as well. How much HP and torque do you think I. 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. 1983 Mustang G.T. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - anyone have experience with GT40P heads on a 92 351W - ive got a 92 F250 with a 351W that needs a pretty serious rebuild. When compared to the new generation of performance engines on the market today like the 5.0L DOHC Coyote engine, your engine will not come close. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. A good port job can set you back another $500-$1,000. We've already been motivated to put this engine in a buddy's Mustang. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. Aftermarket headers, such as those made by Hooker, BBK and Competition Engineering, are better and are just as easy, if somewhat more expensive, to procure used. Eldelbrocks Air Gap intake manifold should work well with the combination. 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. The tube headers showed a gain of almost 100 hp! Well offer one as an example. For real performance, stock E7TE heads leave a lot to be desired. . Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. - I have a 1989 f150 with a 302 5 spd. This engine will be good for your 65 Mustang. Once the headers are in place, then you can consider if you still want more power. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. Sponsored. '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 Even with a stock Mustang 5.0 cam makes good power. You could run a thinner head gasket as well. Its NA but makes use of AFR heads and some other aftermarket goodies. this head is complete with new 1.837 int valves and 1.536 exhaust valves. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Anythoughts? Not bad for off the shelf parts and a stock shortblock. 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. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. I must agree with Jeff Smith. I'm new and I'm currently building a 302 on a budget and want to raise compression without milling heads but by pistons and I want to get close to 10:1. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. i have a question once i get the gt40p heads from the explorer truck can i also take the exhaust manifolds or headers and fit them in my 66 mustang:?:!?!?!? Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. Manual trans. Performance & security by Cloudflare. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Long tube headers are a terrific idea, but you need to open up the exhaust side. JavaScript is disabled. That's a good combo in my book. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. This website is using a security service to protect itself from online attacks. For a better experience, please enable JavaScript in your browser before proceeding. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I am very happy too. And remember ENGINES have been being built/rebuilt/modified for years. any input is apprecciated:smartass: Thank you for the info, if all I have to worry about is the plugs then I'm in good shape hahaha. For 2018, the Coyote makes 460 hp. The heads got a 3 angle valve job, new valves from speed-pro and all the valve train was from crane that matched the current hydraulic cam. All this is worth it. FULL DYNO RESULTS. 302 explorer short block with roughly 80k miles GT40's from a local u pull n pay ($97) weiand x-celerator trick flow stage 1 cam 650 holley double pumper car made 322/329 SAE . You keep stock drivability, and stock gas milage if you can stay out of boost. (Please note these are not GT40P Explorer heads). Sure, you could race-port the existing E7 castings, which many have done, but then you're putting quite a bit of change into stock heads. Scorpion 1.6 roller rockers. 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. Just make sure it is a roller cam. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . Ha! These engines came with the GT40P head, which even with its small valves, offers really good performance. 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. I have managed to get 402 horse power from a 289 hipo natural aspirated. I got rid of the carburetor and went with a F.A.S.T. Torque on the other hand isnt something to write home about. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! BONUS TEST-FOUR DIFFERENT 302 INTAKES.. +1 I would go with the regular GT40 heads. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! Here a comparison of different heads on a 302: I'm very happy with my GT40P. 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. Be careful, I was once bitten by one of those reptile engine builders. JavaScript is disabled. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. Learn how your comment data is processed. GT40Ps have 58cc. I need that part number too! Win or lose, if you buy the ticket you must take the ride. Holley 670 street avenger carb. While we've seen engine dyno tests performed with GT-40P heads replacing factory E7TE castings and resulting in a boost of more than 25 hp, we have reluctantly set our horsepower gain goal at 25 ponies, as well. Maybe I'll think about a cam swap? this head fits years 95-01 explorer mountaineer mercury mountaineer . I would like to know what heads, cam and intake manifold combination to use for the most HP I can squeeze out of that motor. 1983 Mustang G.T. As you might expect with more duration, the idle quality dropped significantly but was still able to make 11.5 inches of vacuum at 980 rpm. 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. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads use an external EGR connective system. We compare the GT40s to modern cylinder heads as well as other heads from the era. You'll have to plug the oil hole that is in the engine from the old oil dipstick. 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 4 BAR HEADS IN GOOD CONDITION . T5z and 3.89 9" TL rear. Related Resources Mustang Generation Nicknames: What Do They Mean? At the dragstrip, we gained two-tenths and 2 mph. Joined . Your IP: You can have your current 28 oz rebalanced to 50. Do you guys have part numbers for the spring kits? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) I'd get the gt40 setup, and put an s trim on it. These heads have been remanufactured using refaced reclaimed Factory Valves. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. Install a "wet" nitrous plate system (which carries both nitrous and fuel) onto the intake manifold and jet it conservatively for a 100 horsepower shot. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. If you're not a header kind of guy, the repro 289 HIPO manifolds bolt up to the GT40P heads with plenty of spark plug room. What did the heads flow? i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). It turned out we were conservative on both counts. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. When combined with modern power-makers, such as nitrous, the 302 is more than capable of producing 400+ horsepower for little more than the cost of a stock engine rebuild. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Not to mention, they will run circles around GT40P's out of the box. OR you could put your automotive journalistic skills in motion by reporting on the many new modern components available for the latest generation 351 Cleveland. I have to agree, the GT40P heads flow better than the GT40 iron heads. That said there are some better aftermarket options for heads also. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Their weak point is that the rotator used on the exhaust valve is very thick. 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. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. So I've got the motor and heads already for my maverick project. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. Paying a premium for a set of GT40P heads or dumping money into some to get their performance to rival aftermarket is not for me. Some ideas never go out of style. Save narve00 Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. Im a different animal. For this reason, we're not sure what kind of boost the GT-40P heads will give. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. Not sure how they would mate up to your existing exhuast, but otherwise they should work. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. fuel injection system . 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. Free shipping for many products! Compare. I got a GT40P off the assembly line years ago. this is the price for one head. Because of this, your tuneup will probably need to be modified. I'm also have the regular GT40 heads on my current build. Gt40 heads/intake from a jy explorer, leave the . The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. 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. 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.