The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. 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. For the most part 302 heads and 351W heads are the same. First, adding headers will improve power on the existing combination. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. The later model distributors had a different diameter shaft than the earlier ones. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. are you twisted331 also? how much HP and torque? This is what I recommend to everyone who is doing a budget 5.0 build. Hey all, I'm working on building a 302 with my gt40p heads. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. FULL DYNO RESULTS. And have discovered something that I dont think anyone else knows. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . Yeah, except those. a) ain't early and b) aren't 289 heads. 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. For a better experience, please enable JavaScript in your browser before proceeding. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. 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. This is the main reason why these engines are not modified as much as the small block Chevy. $169.50. http://vb.foureyedpride.com/showthread.php?t=89153, http://www.facebook.com/groups/233213650060739/, 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 Well that article just got me very ancy, I want these heads!! This kind of improvement may not seem like much, but the owner of our test car, Jamie Holten, runs in FFW Trophy Stock where three-tenths is a lifetime. The combination of this cam with your intake and headers will produce a very nice street engine. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! For all of us interested in Gt40p heads. Hey Motorheadty,Like your comments,question for ya,I have a 92 convertible,just bought a 5.0 out of a 94 gt that was just freshened up top end,gt40p heads w/new springs etc for the new E303 cam,new FRP roller lifters,Crane 1.7 rockers,hardened push rods,double roller timing set,all put on a bottom end w/104000 miles,needless to say previous owner pulled said engine after 800 miles and now building a 351,I pulled engine down my machinest,putting forged internals in and bolting everything back together,I want to run about a 150 shot N2o,and iam going carb,wondering which intake would be best w/the 150 shot,heard that dual planes might not be the way to go? Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. How to Build a Budget 383 Stroker Chevy How do I Increase Horsepower on a 440 Cylinder Head Specifications for a 1969 How to Get More Power Out of a 92 4.3 dragster engine image by Robert Young from, Copyright 2023 Leaf Group Ltd. / Leaf Group Media. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. Thank You. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. Mar 23, 2004. Many years ago, a friend bought a used 2001 Mercury Mountaineer 5.0L that was equipped with a set of really decent GT40P style iron heads. This will cost additional money but is still worth it, in our opinion. 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. Scorpion 1.6 roller rockers. 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. Well assume it is a 5.0L with stock 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. 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. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Limited header choice is certainly a challenge. If you know him, ask him. The hardest part of swapping the cam was just getting the timing cover off and back on again. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. 1 - 7 of 7 Posts. And remember ENGINES have been being built/rebuilt/modified for years. With nitrous, this is easily a mid-11-second ride. Eldelbrocks Air Gap intake manifold should work well with the combination. The Fora platform includes forum software by XenForo. 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. Joined: Sun Mar 15, 2009 9:31 am. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. 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. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. $139.99. He'll have to get a gear for his distributor. Not to mention, they will run circles around GT40P's out of the box. Anythoughts? Depends on the budget. Install a set of 1.7:1 roller-tipped rocker arms on the heads. 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. I had a set of 69 302 heads I ran for a while . 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. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. Nice to see actual dyno results instead of "butt dyno" guesses. 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. 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. Similar to regular GT-40 heads, the biggest difference between the two is that the P-heads feature a revised spark plug angle which extends the plug into the combustion chamber, putting the flame front close to the absolute center of the chamber, resulting in a smoother combustion process. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Maybe I'll think about a cam swap? Never not once have I ever seen a SBF rod bolt create a failure. 1983 Mustang G.T. What did the heads flow? There are a lot of variables that must be addressed to give a better estimate, but a good basic estimate is 20-40 HP at the crank. I recall having an absolute blast with my old K-code coupe back in the day. T5 with 3.73s. +1 I would go with the regular GT40 heads. Calculated compression to 9.8:1. JavaScript is disabled. GT40s have 64cc chambers. 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:?:!?!?!? The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . There are caveats to this plan, however. Would have liked to see a comparison done on the same short block using a set of decently-ported early non-Thermactor iron heads Tracy Blackford, 65 Mustang FB, 331 built with 289 H beam rods and 383W piston, 282S cam, self ported '70 351w heads, Dougs Tri-Y headers. That's more than enough to feed a power-brake booster. Then why did you port the heads and how do you know if you made an improvement. Related Resources Mustang Generation Nicknames: What Do They Mean? A mild porting with gasket matching will be very good. at the crank. Free shipping for many products! 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. You can use the stock roller lifters with any size cam you want. 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. 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. 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. If you dont feel comfortable doing this higher a pro. There's not a lot of reson to use 351 heads later than '75 since they essentially identical to 302 heads except for head bolt holes. Torque on the other hand isnt something to write home about. Ive bought wrecking yard SBFs and put 20 lbs of boost to them and spin them to 7000 and made 500 HP with several of them. 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. This website is using a security service to protect itself from online attacks. Assorted screwdrivers, pliers and vise-grips. These are Ford iron GT-40P 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. by travis Sun May 03, 2020 8:33 am. That said there are some better aftermarket options for heads also. The MPH was there to run a little better but the local track is about terrible. 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. 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. Its NA but makes use of AFR heads and some other aftermarket goodies. A trip to Orlando Speed World provided us with updated quarter-mile times. (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. JavaScript is disabled. But dont think that adding a bigger camshaft will make more power. We heated the bottle to 950 psi and hit the button at 4,500 rpm. I added a link to it. The car weighs #2835 with driver. According to his data and verified dyno tests with an EFI 302, you can go above this level if you port the stock, lower intake manifold, or upgrade it altogether. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Consider having the head's intake ports matched to the intake manifold gasket. 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. THANKS VERY MUCH! I have a 5.0 from a 1992 Mustang in my 65. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. You could run a thinner head gasket as well. Shop by category. 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. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. You just want to keep it out of detonation. Sponsored. This is just a quick overview of the changes that need to be done. It runs smooth but seems lazy. 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. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. The heads that were used were also old C8 casting with 58cc chambers. 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. 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. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. HiPo manifolds and Ill be good. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. The asterisk HP differences are calculated using Test 1's 294-hp peak. 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. 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. Like I said lots of options. 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. Weiand 7515 xcellerator intake. Theres many options available for a little more power. Now he serves as a regular contributor to OnAllCylinders. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. For a better experience, please enable JavaScript in your browser before proceeding. I had those on my car before I upgraded and they were nice heads. 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 GT40P heads flow a lot better than stock 351 heads. Im now thinking of adding a cam to match the carb. fordfan289, Aug 27, 2011 I have heard this rod bolt weakness myth for years but have yet to have a single problem with them in any of the SBF engines I have pounded on for the last 30 years and there have been lots of them. For real performance, stock E7TE heads leave a lot to be desired. Choose a cylinder head before you install the pistons. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. A forum community dedicated to Ford Mustang owners and enthusiasts. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. Most all long tubes come out far enough to clear and other short tube headers will work but there is clearance issues on two of the cylinders. Definitely going to use my P heads. Nudge us with emails, and we'll make it happen. Through Central Coast you can have the heads fully prepped for your combination. 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. The Fora platform includes forum software by XenForo. 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. We need a build on a 400+ hp 302/6 build. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. The dyno recorded a peak horsepower reading of 489 hp, but the air/fuel ratio was slightly on the rich side at 11.5:1, so we increased the nitrous jet to a 61 and hit the button again. You can have your current 28 oz rebalanced to 50. $700.98. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? I got rid of the carburetor and went with a F.A.S.T. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . 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. 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. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. Here a comparison of different heads on a 302: I'm very happy with my GT40P. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. The tube headers showed a gain of almost 100 hp! I'm also have the regular GT40 heads on my current build. SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. Once the headers are in place, then you can consider if you still want more power. 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. Yes Mr.Smith, your column here at OAC adorned with extreme performance without power adders, or all Engine as its known, from a superior pushrod Small Block featuring almost all USA sourced modern components with the familiar smell of Ford Blue. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. Over $2050 for the 165/185 renegades. 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. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. Because its all been done time after time after. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. I don't need tons of power to enjoy the car. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Really hurt too. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Location: Re: Stock Ford 351W 4bbl dyno numbers. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. Your email address will not be published. However, since Holten's car has an E303 cam, we didn't want the pistons and valves becoming too close, so we chose the 1.6 rockers. Mac and Ford Motorsport both make a GT40P spacific header. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! Well also assume that this engine is running stock exhaust manifolds. Yes- thank you. 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. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. Adding the headers may also require a slight increase in secondary (and possibly primary) jetting to ensure the proper air-fuel ratio, but thats also an easy tuning change. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. Stock valve sizes? 02-11-2012, 07:16 PM #6 fiveoh 86lx MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. 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. made more power everytwhere and 40 hp is respectable. 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.

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