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. Or just play it safe and let the fans ask away about another daring 5.0 TB bolt on or for an exciting surprise, do a LS______ fill in the blanks. There are too many variables to add to this regarding aftermarket stroker kits or components. (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 reason for this is that we're actually replacing mildly worked E7TE heads. 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. As usual, there is much more to this story. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. For a better experience, please enable JavaScript in your browser before proceeding. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. . So . A COMP hydraulic roller cam we found works well with this combination. How much HP and torque do you think I. If you dont feel comfortable doing this higher a pro. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. Because of this, your tuneup will probably need to be modified. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. All costing in the end at least another $2k. If you have a early 351W ie pre 76 it probably . We decided on a Powerstar kit from Nitrous Supply, owned by our good friend Mike Thermos, who was one of the original nitrous kit suppliers back in the early '80s. It runs smooth but seems lazy. This time around, we chose a shining example of this junkyard art form. And have discovered something that I dont think anyone else knows. A mild porting with gasket matching will be very good. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? 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. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. We then dyno'd the car without the fan to get some consistency and were rewarded with a peak of 316 hp at 5,500 rpm, and 348 lb-ft of torque at 4,000 rpm. well i finally did my first ever carb build, ive always been an EFI guy Black 1985 GT: 408w, in the 6's in the 1/8 mile. Yea. 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'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. 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. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. Tim's junkyard refugee survived the beating and we had a bitchin' story. I had a set of 69 302 heads I ran for a while . 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. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. 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. Here a comparison of different heads on a 302: I'm very happy with my GT40P. how much HP and torque? Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . Everything fits, use the stock rockers and pushrods. So I've got the motor and heads already for my maverick project. Just make sure it is a roller cam. I must agree with Jeff Smith. 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. GT40s have 64cc chambers. 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. I ran the Speed Pro L2488 pistons and it had me around 9.9 compression with a .041 head gasket, Now I had GT40 heads milled .020 and so that's just a guess on the CC. Performance & security by Cloudflare. 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 I love my setup and it is very strong engine. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. That's more than enough to feed a power-brake booster. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. However there are plenty of factory heads that with the help of an experienced machine shop can be great. #3::: Do your homework,get quality parts,dont skimp. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. The Fora platform includes forum software by XenForo. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. JavaScript is disabled. PTP Engineering front suspension and 25540R17s all around. at the crank. Overview. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. I view the GT40P heads similar to Granada brakes. The "P" heads flow better. 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. The heads that were used were also old C8 casting with 58cc chambers. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. These are Ford iron GT-40P heads. Your IP: The Fora platform includes forum software by XenForo. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. 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. Compare. The Fora platform includes forum software by XenForo. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. Scorpion 1.6 roller rockers. Sponsored. Runs well. The GT40P heads flow a lot better than stock 351 heads. We've seen what happens from previous Ford experience when power levels above 500 hp tend to either pop head gaskets or saw blocks in half. I added a link to it. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. What did the heads flow? 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. Not sure how they would mate up to your existing exhuast, but otherwise they should work. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. You need to check. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. This is the main reason why these engines are not modified as much as the small block Chevy. Torque on the other hand isnt something to write home about. Ive been building ENGINES for 40+ years. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. (its not their engine) Nudge us with emails, and we'll make it happen. We compare the GT40s to modern cylinder heads as well as other heads from the era. You can have your current 28 oz rebalanced to 50. 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:?:!?!?!? VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. 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. 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. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . Learn how your comment data is processed. Over $2050 for the 165/185 renegades. 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. Ported Hurricane Single Plane and custom 750 HP. Your email address will not be published. Every thing he tells you on this site is true. Most of them are aware of what changes need to be completed. All this is worth it. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Both swaps made more sense when parts were readily available at the bone yard for cheap. He'll have to get a gear for his distributor. Their weak point is that the rotator used on the exhaust valve is very thick. 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. 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. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. Mac and Ford Motorsport both make a GT40P spacific header. 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. An aggressive cam will wake it up a bit. The Fora platform includes forum software by XenForo. Some ideas never go out of style. I had those on my car before I upgraded and they were nice heads. Step 2. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. I have a 5.0 from a 1992 Mustang in my 65. $930.00 + $55.00 shipping. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . Do you guys have part numbers for the spring kits? Im a different animal. This will cost additional money but is still worth it, in our opinion. Definitely going to use my P heads. ***Most important is theStupid question is the one that was never asked!*** 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. GT40P heads, what kind of performance do they give? AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. 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? The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. He'd be the best source. In less than an hour, we were ready to test. I've got gt40p heads for it I'll be running, and can't afford better . 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. Posted on May 07, 2014 by promarengine. 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. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. Anyways, I know the gt40ps will bump . You didnt mention which cam you had in mind. Ill do springs and a moderate cam and go for a good, dependable power plant. made more power everytwhere and 40 hp is respectable. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. But dont think that adding a bigger camshaft will make more power. The older pushrod engines just dont offer the same kind of power potential for their displacement and it all has to do with cylinder head flow. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . If you're running a stock cam, 1.7 rockers will work perfectly. Weiand 7515 xcellerator intake. 68 XR7 & 68 M-100. This is an older thread, you may not receive a response, and could be reviving an old thread. HAD '82 GT monochromatic (red).black cloth HAVE Smith began writing for Car Craft magazine in 1979 and became editor in 1984. That said there are some better aftermarket options for heads also. I got rid of the carburetor and went with a F.A.S.T. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Without changing the stock pistons. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. Thanks. 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.