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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. This will keep you from dropping your overall static compression ratio and losing power. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. 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. fuel injection system . Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. Have fun, be safe, enjoy. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. With gt40p heads and 289 hipo exhaust manifolds changing sparkplugs is the same as the original 302 heads and manifolds, I use the spark plugs that are recomended for the explorer with gt40p heads and you can use straight or angled boots. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. 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. 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. A forum community dedicated to Ford performance owners and enthusiasts. The kit offers adjustable power from 50 to 250 hp with a simple jet change. You can have your current 28 oz rebalanced to 50. This is a common mistake with first-time cam buyers who dont necessarily appreciate that the cam is just one component of the overall engine package. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. 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. Long tube headers are a terrific idea, but you need to open up the exhaust side. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. 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. GT40Ps have 58cc. At the dragstrip, we gained two-tenths and 2 mph. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. Assorted screwdrivers, pliers and vise-grips. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. Cant wait to try um out. 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. Im new and Im 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. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. When building an engine there is a lot to take into consideration. (its not their engine) Without changing the stock pistons. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. 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. Just make sure it is a roller cam. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. 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'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. However there are plenty of factory heads that with the help of an experienced machine shop can be great. Shop by category. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? 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. check out the. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. Where they differ is the combustion chamber size. Everything fits, use the stock rockers and pushrods. The reply has so many assumptions that I cant even assume to know the answer. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. Good on ya Jeff Smith. 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. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. Compare. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. PTP Engineering front suspension and 25540R17s all around. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. All costing in the end at least another $2k. Depending on the Headers you have you might be okay. 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. The car weighs #2835 with driver. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? Runs well. The valve seats have been cut on a . I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. 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:?:!?!?!? Let us explain. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. In an effort to preserve the history of the Early Fox Era, FEP covers the following vehicles: 79-86 Mustang and Capri, 84-86 Mustang SVO, 78-83 Fairmont & Zephyr, 83-86 LTD & Marquis, 80-88 Thunderbird & Cougar, 82-87 Continental, 84-92 Mark VII, 81-82 Granada. Enter your search keyword. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. Anyways, I know the gt40ps will bump . 1983 Mustang G.T. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. But the part about a cam replacement possibly being a labor intensive undertaking is correct. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. You could run a thinner head gasket as well. 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. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . If you're running a stock cam, 1.7 rockers will work perfectly. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. Your email address will not be published. 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. GT 500; Posts: 8496; Location: Brisbane . Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. Take the assembly to a machine shop to have it balanced and install it in the block. Joined . 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. I had those on my car before I upgraded and they were nice heads. And remember ENGINES have been being built/rebuilt/modified for years. 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. For a better experience, please enable JavaScript in your browser before proceeding. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. Win or lose, if you buy the ticket you must take the ride. Ive been building ENGINES for 40+ years. Those heads were unported and had stock valve sizes! If I get different urges later, Ill pursue those then. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) Every thing he tells you on this site is true. The gt40p head is considered the best OEM 302 head made. 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. 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. Tim's junkyard refugee survived the beating and we had a bitchin' story. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. There are too many variables to add to this regarding aftermarket stroker kits or components. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. A good port job can set you back another $500-$1,000. The GT40P heads flow a lot better than stock 351 heads. . A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . Sponsored. 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. I spin it to 6500 and thats about it. With nitrous, this is easily a mid-11-second ride. +1 I would go with the regular GT40 heads. A forum community dedicated to Ford Mustang owners and enthusiasts. 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. Ha! 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.