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A forum community dedicated to Ford Mustang owners and enthusiasts. . I turned it because it was tired when I got it. 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. For 2018, the Coyote makes 460 hp. These are a great head but do need some machining mods to make they really work well. 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. The Fora platform includes forum software by XenForo. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. Some ideas never go out of style. We need a build on a 400+ hp 302/6 build. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. Manual trans. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. This will keep you from dropping your overall static compression ratio and losing power. However there are plenty of factory heads that with the help of an experienced machine shop can be great. 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. How much HP and torque do you think I. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. 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. Compare. Runs well. HiPo manifolds and Ill be good. (A starter is a motor, windshield wipers use a motor,electric windows use motors) Any one uses that terminology in my shop will be corrected once, only once. $700.98. 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. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. With. While the heads were off getting a massage, we turned our attention to the cam timing. You can use the stock roller lifters with any size cam you want. 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. For a better experience, please enable JavaScript in your browser before proceeding. Im now thinking of adding a cam to match the carb. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. 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. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. Very true about finding them at the local yards. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. I had a set of 69 302 heads I ran for a while . 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! Im a different animal. Joined . It turned out we were conservative on both counts. For a better experience, please enable JavaScript in your browser before proceeding. Compare. Assuming this will be a daily driver engine, a short duration camshaft, especially when combined with a four-barrel dual plane intake manifold and headers, will deliver extremely snappy throttle response and the whole combination will increase the torque and peak horsepower by somewhere in the neighborhood of 20 to perhaps 35 horsepower. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. 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. I got lucky and found a complete Explorer GT40P engine online. I recall having an absolute blast with my old K-code coupe back in the day. A forum community dedicated to Ford performance owners and enthusiasts. 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. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. They almost seem like flywheel numbers rather than RWHP numbers. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. At the dragstrip, we gained two-tenths and 2 mph. I view the GT40P heads similar to Granada brakes. ***Most important is theStupid question is the one that was never asked!*** Motor is going into a Ranger. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. How to Build a Budget 383 Stroker Chevy How do I Increase Horsepower on a 440 Cylinder Head Specifications for a 1969 How to Get More Power Out of a 92 4.3 dragster engine image by Robert Young from, Copyright 2023 Leaf Group Ltd. / Leaf Group Media. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. We know what you're thinking--only two-tenths from an extra 45 hp? Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! Cloudflare Ray ID: 7a2e2d95dedea1e4 Because its all been done time after time after. What would be the best cam and springs to use for these heads in a 302 Windsor? 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Scorpion 1.6 roller rockers. AFR 165cc 58cc Heads. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. This is what I recommend to everyone who is doing a budget 5.0 build. The only way to really make more power is to go with a stroker kit, blower and/or heads. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? check out the. Best of all, no machining is required to install these on your stock cast iron heads! You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. 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. Keywords 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. 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. 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. GT40s have 64cc chambers. (Image/Harrison Creamery). I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . 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. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. They fill that spot between power and budget. Do you guys have part numbers for the spring kits? So I've got the motor and heads already for my maverick project. Slover primarily focused on the exhaust side of the GT40P heads. For a better experience, please enable JavaScript in your browser before proceeding. Weiand 7515 xcellerator intake. 1 - 7 of 7 Posts. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. It runs smooth but seems lazy. 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. 68 XR7 & 68 M-100. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. 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. Sponsored. Sure, you could race-port the existing E7 castings, which many have done, but then you're putting quite a bit of change into stock heads. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. 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. JavaScript is disabled. PTP Engineering front suspension and 25540R17s all around. 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 GT40P heads flow a lot better than stock 351 heads. As a matter of fact, Central Coast has an '89 coupe with GT-40P heads that has run a best of 11.98 in the quarter-mile. Not bad for off the shelf parts and a stock shortblock. On slicks the car went some low 7.70s right at 90mph. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. $700.98. 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. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. Not to mention, they will run circles around GT40P's out of the box. 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. They work, but present their own challenges. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. That said there are some better aftermarket options for heads also. I had those on my car before I upgraded and they were nice heads. I'm an old school guy (289 in 65 mustang), and I'm just looking into the new 5.0 engine (roller cam) stuff recently. The asterisk HP differences are calculated using Test 1's 294-hp peak. I am working on a set of iron GT40s hoping it goes faster. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. We decided on a Powerstar kit from Nitrous Supply, owned by our good friend Mike Thermos, who was one of the original nitrous kit suppliers back in the early '80s. The Fora platform includes forum software by XenForo. These cast piston short-blocks are not quite as good as the forged piston 5.0L that came in Fox-body Mustangs, but the GT40P heads flow much better than earlier 5.0L heads. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. 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. Or, you could invest in a new set of heads that would also do the same job but you can expect to spend quite a bit more money. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. A COMP hydraulic roller cam we found works well with this combination. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. As usual, there is much more to this story. I'm also have the regular GT40 heads on my current build. are you twisted331 also? Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. 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. I was looking at putting on the GT40P heads on. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. Because of this, your tuneup will probably need to be modified. For a better experience, please enable JavaScript in your browser before proceeding. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. Keep in mind that swapping camshafts is a fairly extensive effort. Well that article just got me very ancy, I want these heads!! Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. well i finally did my first ever carb build, ive always been an EFI guy Black 1985 GT: 408w, in the 6's in the 1/8 mile. fuel injection system . And remember ENGINES have been being built/rebuilt/modified for years. Take the assembly to a machine shop to have it balanced and install it in the block. The reason this new generation of Ford engines make a ton more power is they also enjoy fantastic cylinder heads and four valves per cylinder. this is the price for one head. Its NA but makes use of AFR heads and some other aftermarket goodies. 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. Calculated compression to 9.8:1. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. You could run a thinner head gasket as well. Instructions on porting the GT-40p heads here. The best thing to do would be to use a specific break-in oil for the first 200 to 300 miles of use to reduce the change of a potential problem with undue wear. Long tube headers are a terrific idea, but you need to open up the exhaust side. As with all head installations, check piston-to-valve clearance before final startup. You didnt provide a lot of information about the engine itself, Im assuming its 85 or newer ( roller cam) May need a freshen up of the bottom end if compression is the issue. Well also assume that this engine is running stock exhaust manifolds. Those are really good numbers. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . Over $2050 for the 165/185 renegades. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. Free shipping. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. 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. The GT40P heads flow a lot better than stock 351 heads. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. how much HP and torque? 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. 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. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. 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. This is not a criticism but instead consider it to be more of a heads-up. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. . Cant wait to try um out. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads If you know him, ask him. 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 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. I have a 432 HP non Hi Po 289 I built. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. Sponsored. Definitely going to use my P heads. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Also, the spark plug angle makes it a pain. But don't think that adding a bigger camshaft will make more power. There are a lot of variables that must be addressed to give a better estimate, but a good basic estimate is 20-40 HP at the crank. Required fields are marked *. 1983 Mustang G.T. Like I said lots of options. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient.