With nitrous, this is easily a mid-11-second ride. The Fora platform includes forum software by XenForo. The later model distributors had a different diameter shaft than the earlier ones. 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. A forum community dedicated to Ford performance owners and enthusiasts. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. Not to mention, they will run circles around GT40P's out of the box. check out the. Most of them are aware of what changes need to be completed. #1:::Throw out all your Magazines that suggest what to do! We know what you're thinking--only two-tenths from an extra 45 hp? A forum community dedicated to Ford Mustang owners and enthusiasts. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. JavaScript is disabled. I have a 432 HP non Hi Po 289 I built. Maybe I'll think about a cam swap? 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. '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 Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . Im a different animal. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. i know a guy who used to build race engines so he has all the right tools, how much would it help to get the heads ported and polished or anything else he could do to them. made more power everytwhere and 40 hp is respectable. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. anyone have experience with GT40P heads on a 92 351W For a better experience, please enable JavaScript in your browser before proceeding. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? 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. Nice to see actual dyno results instead of "butt dyno" guesses. Sponsored. Step 2. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. Real world data seems to show that GT40 or GT40P cylinder heads, assuming no other mods on your Foxbody, are good to add anywhere between 20-40 HP (over stock heads). $700.98. 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. Stock Ford 351W 4bbl dyno numbers - Don Terrill's Speed-Talk You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. 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. 302, GT40P Heads, E cam, 4 into 4, Holley 600, Mallory Unilite, Levy SD T5, 3.73, 15" Team III, firewall mod, trunk mod, trailer hitch, drivers foot box mod, front tow rings. 351W with GT40P heads? | Mercury Cougar Owners What Are The GT40 & GT40P Heads? - LMR.com For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. 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. 02-11-2012, 07:16 PM #6 fiveoh 86lx That's a good combo in my book. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. 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. 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. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. The Fora platform includes forum software by XenForo. He'd be the best source. Mac and Ford Motorsport both make a GT40P spacific header. AFR 165cc 58cc Heads. Boy, were we surprised with the results. Your email address will not be published. However, stepping up in the performance head market will set you back more than $1,200 for a decent pair of aluminum castings--and that's straight out of the box, with no porting. Yea. This is an older thread, you may not receive a response, and could be reviving an old thread. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. You gave me the info I was looking for, and I really do appreciate it. Ask Away! with Jeff Smith: Camshaft and Cylinder Head Recommendations Well that article just got me very ancy, I want these heads!! These engines came with the GT40P head, which even with its small valves, offers really good performance. JavaScript is disabled. Really hurt too. 302HO with gt40p heads | Mustang Forums at StangNet 331/347 stroker w/gt40p's, waste?Hp?cost involved? - Maverick We decided to test both ideas, so we ordered two roller cams from Lunati: a shorter-duration cam that would deliver decent idle vacuum and maybe make around 320 to 335 hp, and a longer-duration version that might push the horsepower up to perhaps 350 hp. These are some of the pictures I have showing the Explorer manifolds. 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. Long tube headers are a terrific idea, but you need to open up the exhaust side. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. 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. 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. 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. I got rid of the carburetor and went with a F.A.S.T. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. 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. timing and compression ratio with gt40p heads - Modded Mustang Forums One benefit gt40P head will have over other 80's-90's model heads, including the gt40 head, is that it has a smaller combustion chamber much like the original 289 heads. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. 1979 Indy 500 Pace Car. I had those on my car before I upgraded and they were nice heads. The MPH was there to run a little better but the local track is about terrible. THANKS VERY MUCH! I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. If I get different urges later, Ill pursue those then. Building 400hp Into A 5.0L Small-Block Engine - MotorTrend Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). gt40p headers | Maverick/Comet Forums (Image/Harrison Creamery). Those are really good numbers. Where they differ is the combustion chamber size. However there are plenty of factory heads that with the help of an experienced machine shop can be great. There are too many variables to add to this regarding aftermarket stroker kits or components. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. 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 . Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. 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. 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. First, adding headers will improve power on the existing combination. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers.
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