You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. Ha! We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. 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. Install a set of 1.7:1 roller-tipped rocker arms on the heads. I got lucky and found a complete Explorer GT40P engine online. Keep in mind that swapping camshafts is a fairly extensive effort. Well that article just got me very ancy, I want these heads!! PTP Engineering front suspension and 25540R17s all around. 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. this head is complete with new 1.837 int valves and 1.536 exhaust valves. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! 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. You didnt mention which cam you had in mind. Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. Stock valve sizes? 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. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. 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. 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. 02-11-2012, 07:16 PM #6 fiveoh 86lx Like I said lots of options. How much HP and torque do you think I. 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. 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. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! 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. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. However there are plenty of factory heads that with the help of an experienced machine shop can be great. 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. Theres many options available for a little more power. 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. Its increase while significant is still only about that of a decent 351 w, hi im building a nastalgic car so im not going to drag race it but it must go ok ive got a 302 windsor basicly recoed stock but i want to run tunnel rams to go with the the3am would like to put choppy cam and replace the heads any ideas would be much apprecited thankyou, What is the stock head cc of a 1992 f150 302 windsor. That's fantastic for the minimal investment we made. 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. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. (Image/Harrison Creamery). Very true about finding them at the local yards. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. This is the main reason why these engines are not modified as much as the small block Chevy. 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. GT40Ps have 58cc. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. $139.99. $930.00 + $55.00 shipping. The longer duration created a slight loss of torque below 3,300 rpm compared to both previous cams, but beyond that mild loss of power, the bigger Voodo out-powered its smaller cousin, cranking out a peak torque of 355 lb-ft at 4,300 (a gain of 7 lb-ft over Test 2) and charging to a peak horsepower of 376 at 6,000 rpm. Yea. 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. 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. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? Assorted screwdrivers, pliers and vise-grips. I got rid of the carburetor and went with a F.A.S.T. Sponsored. 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. 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. That's more than enough to feed a power-brake booster. 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. No-option stripper- I like strippers. These engines came with the GT40P head, which even with its small valves, offers really good performance. Related Resources Mustang Generation Nicknames: What Do They Mean? If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. how much HP and torque? The GT40 heads are a bit more versatile, working with the 5.4 and 6.8, while the GT40P (Explorer/Mountaineer) heads will only work on the 6.8 due to an interference issue. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. For all of us interested in Gt40p heads. There are too many variables to add to this regarding aftermarket stroker kits or components. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. You keep stock drivability, and stock gas milage if you can stay out of boost. So I've got the motor and heads already for my maverick project. There are caveats to this plan, however. This will cost additional money but is still worth it, in our opinion. But don't think that adding a bigger camshaft will make more power. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. this head fits years 95-01 explorer mountaineer mercury mountaineer . We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. 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. JavaScript is disabled. You need to check. Learn how your comment data is processed. Take the assembly to a machine shop to have it balanced and install it in the block. Using the manufacturer recommended springs for your camshaft are a safe bet. These timeslips are from 1280' above sea level. Not bad for off the shelf parts and a stock shortblock. The GT40P 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! (its not their engine) Not sure how they would mate up to your existing exhuast, but otherwise they should work. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. The gt40p head is considered the best OEM 302 head made. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. (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. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. We need a build on a 400+ hp 302/6 build. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. 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 will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. 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. 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. 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 that is a healthy budget deal. Be careful, I was once bitten by one of those reptile engine builders. You just want to keep it out of detonation. 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. For a better experience, please enable JavaScript in your browser before proceeding. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. SBF engines are modified constantly. That said there are some better aftermarket options for heads also. Rowe studied engineering, philosophy and American literature at Central Florida Community College. JEGS High Performance. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! I have a 5.0 from a 1992 Mustang in my 65. Along with the heads, we used MAC headers for GT-40P heads. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. never messed with the timing, its at 35* total . Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. Buy the lifters for peace of mind now and hopefully for the duration. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. 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. Holten runs the factory fan, but he had removed it when he ran the 12.63. 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? Save narve00 These heads have been remanufactured using refaced reclaimed Factory Valves. I have a very good running stock 1981 302 in a F100 short box. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. Maybe I'll think about a cam swap? Then why did you port the heads and how do you know if you made an improvement. An aggressive cam will wake it up a bit. Click to reveal We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. 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. Those heads were unported and had stock valve sizes! 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. This time around, we chose a shining example of this junkyard art form. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. Holten's best time is a 12.63 at 105.9 mph, and if we gain the desired result he will be right in the thick of things in Trophy Stock competition. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. Consider having the head's intake ports matched to the intake manifold gasket. by travis Sun May 03, 2020 8:33 am. I am working on a set of iron GT40s hoping it goes faster. A mild porting with gasket matching will be very good. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . . This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) Im 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. Runs well. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. We heated the bottle to 950 psi and hit the button at 4,500 rpm. This is just a quick overview of the changes that need to be done. They almost seem like flywheel numbers rather than RWHP numbers. . 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. Manual trans. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. When building an engine there is a lot to take into consideration. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. Car Craft mag. Not looking for crazy HP. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. Instructions on porting the GT-40p heads here. people can stop saying that adding aftermarket cam with stock heads is a waste of time. The Fora platform includes forum software by XenForo. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. 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. Most of them are aware of what changes need to be completed. Im now thinking of adding a cam to match the carb. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. You can email the site owner to let them know you were blocked. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. Pretty sure that was name, but I could be wrong. He'll have to get a gear for his distributor. 97% Positive Feedback . Cloudflare Ray ID: 7a2e2d95dedea1e4 The later model distributors had a different diameter shaft than the earlier ones. Just make sure it is a roller cam. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. Definitely going to use my P heads. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. 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'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. 68stang351 Founding Member May 16, 2002 850 I had a set of 69 302 heads I ran for a while . Performance & security by Cloudflare. Cant wait to try um out. Free shipping for many products! 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. JavaScript is disabled. Everything fits, use the stock rockers and pushrods. 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. Let us explain. A trip to Orlando Speed World provided us with updated quarter-mile times. This will keep you from dropping your overall static compression ratio and losing power. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. A good port job can set you back another $500-$1,000.
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