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:?:!?!?!? You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. But the part about a cam replacement possibly being a labor intensive undertaking is correct. 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. Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. Yea. We compare the GT40s to modern cylinder heads as well as other heads from the era. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Rowe studied engineering, philosophy and American literature at Central Florida Community College. 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. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Build Thread 1965 Fastback Project "Racesteed". These heads have been remanufactured using refaced reclaimed Factory Valves. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! I have a 5.0 from a 1992 Mustang in my 65. It turned out we were conservative on both counts. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. $700.98. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. 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. I got a set of AFR heads , night and day. FULL DYNO RESULTS. I got a GT40P off the assembly line years ago. 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. 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. 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. Took me 7 hours to do one head.but they cleaned up real nice. Here is my setup. I spin it to 6500 and thats about it. check out the. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Its NA but makes use of AFR heads and some other aftermarket goodies. Not looking for crazy HP. (Image/Harrison Creamery). 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. I'll save the effort and lighten my front end by 50# with aluminum. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. 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. 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. 69.90.139.244 Consider having the head's intake ports matched to the intake manifold gasket. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. You can have your current 28 oz rebalanced to 50. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. This is a function of the somewhat wider lobe-separation angle of 112 degrees. They also have emissions legal heads as well. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. This will keep you from dropping your overall static compression ratio and losing power. 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. #1:::Throw out all your Magazines that suggest what to do! T5z and 3.89 9" TL rear. The specs are a conservative 212/218 degrees of duration at 0.050-inch tappet lift but offer a really nice 0.512-inch valve lift for both the intake and exhaust. I just read about this build on the corral.net. $930.00 + $55.00 shipping. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Thanks. 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. This is just a quick overview of the changes that need to be done. I got lucky and found a complete Explorer GT40P engine online. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. JavaScript is disabled. Manual trans. 68 XR7 & 68 M-100. Stock valve sizes? So . Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. 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. 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. Click to reveal 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. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. Theres many options available for a little more power. '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 Mac and Ford Motorsport both make a GT40P spacific header. Your IP: There are caveats to this plan, however. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. Location: Re: Stock Ford 351W 4bbl dyno numbers. 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. There are a couple of reasons for this suggestion. the springs are new stock oem ford. For a better experience, please enable JavaScript in your browser before proceeding. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. 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. Take the assembly to a machine shop to have it balanced and install it in the block. The MPH was there to run a little better but the local track is about terrible. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. For this reason, we're not sure what kind of boost the GT-40P heads will give. The Fora platform includes forum software by XenForo. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. K.S. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Have fun, be safe, enjoy. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. Eldelbrocks Air Gap intake manifold should work well with the combination. I love my setup and it is very strong engine. We know what you're thinking--only two-tenths from an extra 45 hp? Common sense would suggest that with the heavy lifting complete and the old cam removed, by not installing the new roller lifters along with the camshaft could be asking for the possibility of trouble just a few thousand miles down the road. 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. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. They fill that spot between power and budget. We gained 45 hp and 40 lb-ft of torque. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. Those heads were unported and had stock valve sizes! I'd get the gt40 setup, and put an s trim on it. 1979 Indy 500 Pace Car. . 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. Your email address will not be published. The gt40p head is considered the best OEM 302 head made. 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 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. For a better experience, please enable JavaScript in your browser before proceeding. Stock 1989 5.0L HO pistons will work if you can find them. 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. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. I have managed to get 402 horse power from a 289 hipo natural aspirated. . Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. 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. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Holten runs the factory fan, but he had removed it when he ran the 12.63. I got lucky and found a complete Explorer GT40P engine online. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. Their weak point is that the rotator used on the exhaust valve is very thick. Anyways, I know the gt40ps will bump . If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. 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. 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 heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. Assorted screwdrivers, pliers and vise-grips. ***Most important is theStupid question is the one that was never asked!*** Scorpion 1.6 roller rockers. 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. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads 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. If you're going to use the stock 289 heads, install 1.84-inch intake valves, then port the intake and exhaust; these mods will net you about 185 cfm of intake port flow at 0.50 lift. The GT40P heads flow a lot better than stock 351 heads. 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. The heads that were used were also old C8 casting with 58cc chambers. You need to check. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Thanks for the help, I was planning on puttingin roller rockers or at least new springs, and that engine looks great, hoppfully mine will look at least similar to that one of these days. With nitrous, this is easily a mid-11-second ride. The tube headers showed a gain of almost 100 hp! These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. Keep in mind that swapping camshafts is a fairly extensive effort. Related Resources Mustang Generation Nicknames: What Do They Mean? Motor is going into a Ranger. GT40, GT40P, would be great factory heads. It took him and yours truly eight hours from start to finish, using air tools and a lift to gain access to the header flanges. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. 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. He'd be the best source. JEGS High Performance. A COMP hydraulic roller cam we found works well with this combination. 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. 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. Buy the lifters for peace of mind now and hopefully for the duration. An aggressive cam will wake it up a bit. Performance & security by Cloudflare. I am sure you have increased the bore size and possibly even the stroke a bit and spin it up pretty high in the RPM range. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. This is an older thread, you may not receive a response, and could be reviving an old thread. You should be able to get away with a 150 to 200 horsepower shot later, but it's best to start out small and work up. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. HiPo manifolds and Ill be good. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The later model distributors had a different diameter shaft than the earlier ones. In less than an hour, we were ready to test. Required fields are marked *. Not to mention, they will run circles around GT40P's out of the box.