Well that article just got me very ancy, I want these heads!! We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. GT40, GT40P, would be great factory heads. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. A good port job can set you back another $500-$1,000. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. 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. fuel injection system . Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. I have a 5.0 from a 1992 Mustang in my 65. at the crank. 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. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. FULL DYNO RESULTS. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. 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. The MPH was there to run a little better but the local track is about terrible. So I've got the motor and heads already for my maverick project. I'm also have the regular GT40 heads on my current build. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. 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. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! Most of them are aware of what changes need to be completed. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. Do you guys have part numbers for the spring kits? Go for it if you get them super cheap and can get headers/manifolds super cheap as well but otherwise I'd say it's a waste of time and money. 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. Its always refreshing to see a FORD getting a little face time in your column, even if its a tired 302 with no great expectations of setting the world on fire when the dust settles. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. Just put some 1.7 pedistal rocker arm on along with a mild camshaft (make sure to use the correct valve springs), you will make over 300 flywheel hp. Mar 23, 2004. Because of this, your tuneup will probably need to be modified. Ha! 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. 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. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Ill do springs and a moderate cam and go for a good, dependable power plant. The later model distributors had a different diameter shaft than the earlier ones. The GT40P heads flow a lot better than stock 351 heads. Calculated compression to 9.8:1. Even with a stock Mustang 5.0 cam makes good power. 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. (its not their engine) Free shipping for many products! Without changing the stock pistons. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Let us explain. While we've seen engine dyno tests performed with GT-40P heads replacing factory E7TE castings and resulting in a boost of more than 25 hp, we have reluctantly set our horsepower gain goal at 25 ponies, as well. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. For a better experience, please enable JavaScript in your browser before proceeding. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. 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. Calculating pushrod length As usual, there is much more to this story. At the dragstrip, we gained two-tenths and 2 mph. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. Nudge us with emails, and we'll make it happen. Step 1. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. Joined: Sun Mar 15, 2009 9:31 am. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. Win or lose, if you buy the ticket you must take the ride. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! thats after 3 hours of idling/midrange hits to tune the idle and part throttle . While the heads were off getting a massage, we turned our attention to the cam timing. fordfan289, Aug 27, 2011 #3::: Do your homework,get quality parts,dont skimp. i'd love to use these heads,. 1983 Mustang G.T. Assorted screwdrivers, pliers and vise-grips. These are Ford iron GT-40P heads. Install a set of 1.7:1 roller-tipped rocker arms on the heads. never messed with the timing, its at 35* total . I guess I had it backwards, sorry about that, didn't mean to spread misinformation. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. this head is complete with new 1.837 int valves and 1.536 exhaust valves. Choose a cylinder head before you install the pistons. All this is worth it. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. how much HP and torque? 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. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. Holten runs the factory fan, but he had removed it when he ran the 12.63. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. Click to reveal I view the GT40P heads similar to Granada brakes. Not sure how they would mate up to your existing exhuast, but otherwise they should work. The asterisk HP differences are calculated using Test 1's 294-hp peak. Weiand 7515 xcellerator intake. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. Find many great new & used options and get the best deals for FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN at the best online prices at eBay! this head fits years 95-01 explorer mountaineer mercury mountaineer . You could run a thinner head gasket as well. With. These engines came with the GT40P head, which even with its small valves, offers really good performance. JavaScript is disabled. This website is using a security service to protect itself from online attacks. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Slover primarily focused on the exhaust side of the GT40P heads. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. 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 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. Jeff Smith: It would have been better to know a little bit more about your combination, but the short answer is yeswith a hydraulic roller camshaft, assuming the lifters are in good shape and the roller wheels show no unusual wear, they can be re-used on a new cam with no danger of adverse effects. 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. Long tube headers are a terrific idea, but you need to open up the exhaust side. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Good Luck. I have heard this rod bolt weakness myth for years but have yet to have a single problem with them in any of the SBF engines I have pounded on for the last 30 years and there have been lots of them.