I turned it because it was tired when I got it. Ford offered a performance head that was a stock part on 1993-1995 Mustang Cobra models and pre- 1997-1/2 Ford Explorers and Mercury Mountaineers equipped with the 5.0 L engine called the GT-40 head (casting ID F3ZE-AA). Here is my setup. On slicks the car went some low 7.70s right at 90mph. I'll save the effort and lighten my front end by 50# with aluminum. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. 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. There is a better way. So I've got the motor and heads already for my maverick project. just curious. are you twisted331 also? 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. Posted on May 07, 2014 by promarengine. For the cherry on top of this Blue Oval desert, we bolted Mike Thermos' simple Powerstar plate nitrous system under the carburetor, installed the 140-hp jets (55 fuel and 55 nitrous), and used the trigger to retard the timing on the MSD ignition by 8 degrees. 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. As with Chevrolet's small-block engine, the aftermarket has had dozens of years to expand the range and reduce the cost of the parts they offer for this engine. Well that article just got me very ancy, I want these 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. +1 I would go with the regular GT40 heads. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! 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. 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. This will cost additional money but is still worth it, in our opinion. I have a 5.0 from a 1992 Mustang in my 65. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. . Nice to see actual dyno results instead of "butt dyno" guesses. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. 1 - 7 of 7 Posts. You'll have to plug the oil hole that is in the engine from the old oil dipstick. 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. Boy, were we surprised with the results. I got lucky and found a complete Explorer GT40P engine online. Along with the heads, we used MAC headers for GT-40P heads. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . 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. Free shipping. Not looking for crazy HP. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. . Win or lose, if you buy the ticket you must take the ride. 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. You need to check. The hardest part of swapping the cam was just getting the timing cover off and back on again. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . Compare. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. #3::: Do your homework,get quality parts,dont skimp. 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. Now he serves as a regular contributor to OnAllCylinders. Pride is built, in your garage, with your two hands. 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 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. 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. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. FULL DYNO RESULTS. (Please note these are not GT40P Explorer heads). The Fora platform includes forum software by XenForo. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. 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. 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. 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. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. I just read about this build on the corral.net. Good on ya Jeff Smith. check out the. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. Compare. Skip to main content. Depending on the Headers you have you might be okay. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. this is the price for one head. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . It's a classic move we've pulled off many times. Never not once have I ever seen a SBF rod bolt create a failure. 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. by travis Sun May 03, 2020 8:33 am. If you dont feel comfortable doing this higher a pro. You could run a thinner head gasket as well. 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. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. Using the manufacturer recommended springs for your camshaft are a safe bet. The GT40P heads flow a lot better than stock 351 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. Runs well. 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. the engine is carburated of that makes a difference. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. 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. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. 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. I have a very good running stock 1981 302 in a F100 short box. 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? Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. Install a set of 1.7:1 roller-tipped rocker arms on the heads. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. Joined: Sun Mar 15, 2009 9:31 am. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. This test went so well that we were eager to see what the slightly bigger cam would do. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . JavaScript is disabled. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. 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. For a better experience, please enable JavaScript in your browser before proceeding. Not sure how they would mate up to your existing exhuast, but otherwise they should work. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). Rowe studied engineering, philosophy and American literature at Central Florida Community College. While the heads were off getting a massage, we turned our attention to the cam timing. This is an older thread, you may not receive a response, and could be reviving an old thread. $700.98. 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. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped.
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