VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Yea. A forum community dedicated to Ford Mustang owners and enthusiasts. +1 I would go with the regular GT40 heads. What did the heads flow? We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. Nice to see actual dyno results instead of "butt dyno" guesses. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! If you know him, ask him. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. The GT40 heads are a bit more versatile, working with the 5.4 and 6.8, while the GT40P (Explorer/Mountaineer) heads will only work on the 6.8 due to an interference issue. #1:::Throw out all your Magazines that suggest what to do! Free shipping. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads 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. We also discovered some issues with the GT40P heads that required changes, so we added valves from Manley that eliminated the exhaust-valve rotators and allowed us to set the proper valvespring installed height. T5z and 3.89 9" TL rear. 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! Without changing the stock pistons. This is an older thread, you may not receive a response, and could be reviving an old thread. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . 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. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. 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. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. The tube headers showed a gain of almost 100 hp! GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . An aggressive cam will wake it up a bit. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. The "P" heads flow better. The 5.0L with the GT40 head had a 9.0:1 compression, and the 5.0L with the GT40P head had 9.1:1 compression. Theres many options available for a little more power. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Ford offered a performance head that was a stock part on 1993-1995 Mustang Cobra models and pre- 1997-1/2 Ford Explorers and Mercury Mountaineers equipped with the 5.0 L engine called the GT-40 head (casting ID F3ZE-AA). 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. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. We compare the GT40s to modern cylinder heads as well as other heads from the era. Like I said lots of options. 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. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. Not *as* good as the GT40p heads, but I'd prefer to not have to worry about exhaust fitment issues, or have a narrow range of what I can work with. (Please note these are not GT40P Explorer heads). 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. They also have emissions legal heads as well. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. 97% Positive Feedback . Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. Never not once have I ever seen a SBF rod bolt create a failure. Step 1. Torque on the other hand isnt something to write home about. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . Cloudflare Ray ID: 7a2e2d95dedea1e4 Yep my **** is coming apart again Isnt life great! If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. We took the heads to Mike Slover of Slover's Porting Service in Sun Valley, California, to do this work, plus some basic pocket-porting to improve flowespecially on the exhaust side. I had a set of 69 302 heads I ran for a while . Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. There are caveats to this plan, however. 1983 Mustang G.T. 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. This test went so well that we were eager to see what the slightly bigger cam would do. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Consider having the head's intake ports matched to the intake manifold gasket. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. Shop by category. how much HP and torque? Anythoughts? Maybe I'll think about a cam swap? Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Build Thread 1965 Fastback Project "Racesteed". You can have your current 28 oz rebalanced to 50. 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. He'd be the best source. HiPo manifolds and Ill be good. Not sure how they would mate up to your existing exhuast, but otherwise they should work. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Now he serves as a regular contributor to OnAllCylinders. If the head bolt holes are 1/2" or slightly larger, ARP makes the washers and can be sourced from Ford Racing or ARP through a speed shop or Summit, Jegs and PAW among others. Enter your search keyword. Take the assembly to a machine shop to have it balanced and install it in the block. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! I need that part number too! (Image/Harrison Creamery). Pride is built, in your garage, with your two hands. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. that is a healthy budget deal. When building an engine there is a lot to take into consideration. Car Craft mag. However there are plenty of factory heads that with the help of an experienced machine shop can be great. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! GT40Ps have 58cc. 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. If you dont feel comfortable doing this higher a pro. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. Not to mention, they will run circles around GT40P's out of the box. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. 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. Hey Motorheadty,Like your comments,question for ya,I have a 92 convertible,just bought a 5.0 out of a 94 gt that was just freshened up top end,gt40p heads w/new springs etc for the new E303 cam,new FRP roller lifters,Crane 1.7 rockers,hardened push rods,double roller timing set,all put on a bottom end w/104000 miles,needless to say previous owner pulled said engine after 800 miles and now building a 351,I pulled engine down my machinest,putting forged internals in and bolting everything back together,I want to run about a 150 shot N2o,and iam going carb,wondering which intake would be best w/the 150 shot,heard that dual planes might not be the way to go? The only one that's close, is #7. 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. Learn how your comment data is processed. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. These are a great head but do need some machining mods to make they really work well. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. Do you guys have part numbers for the spring kits? He'll have to get a gear for his distributor. Again, assuming this is a nearly stock 5.0L with stock heads, the Weiand Street Warrior dual plane intake and 600 cfm carburetor, its important to not become overly aggressive and choose a big camshaft. Everything fits, use the stock rockers and pushrods. A LOT of them do it these days. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! 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. These heads have been remanufactured using refaced reclaimed Factory Valves. Yes Mr.Smith, your column here at OAC adorned with extreme performance without power adders, or all Engine as its known, from a superior pushrod Small Block featuring almost all USA sourced modern components with the familiar smell of Ford Blue. 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. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. We gained 45 hp and 40 lb-ft of torque. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. As with all head installations, check piston-to-valve clearance before final startup. The valve seats have been cut on a . It turned out we were conservative on both counts. 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. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. Be careful, I was once bitten by one of those reptile engine builders. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. Well assume it is a 5.0L with stock heads. For a better experience, please enable JavaScript in your browser before proceeding. Overview. The kit offers adjustable power from 50 to 250 hp with a simple jet change. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. But don't think that adding a bigger camshaft will make more power. Eldelbrocks Air Gap intake manifold should work well with the combination. 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. I'm new and I'm 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. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. Location: Re: Stock Ford 351W 4bbl dyno numbers. ***Most important is theStupid question is the one that was never asked!*** We heated the bottle to 950 psi and hit the button at 4,500 rpm. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. GT 500; Posts: 8496; Location: Brisbane . For the most part 302 heads and 351W heads are the same. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. If they are cheap enough, take them anyway. 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. GT40, GT40P, would be great factory heads. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. K.S. Took me 7 hours to do one head.but they cleaned up real nice. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. In less than an hour, we were ready to test. JavaScript is disabled. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. how hard to put on? They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. Cant wait to try um out. Just make sure it is a roller cam. For this reason, we're not sure what kind of boost the GT-40P heads will give. people can stop saying that adding aftermarket cam with stock heads is a waste of time. Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. Ford Factory 5.0 Performance Cylinder Heads. 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. We need a build on a 400+ hp 302/6 build. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. I added a link to it. So . I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Runs well. Ive bought wrecking yard SBFs and put 20 lbs of boost to them and spin them to 7000 and made 500 HP with several of them. 68 Mustang GT/CS Highland Green, PS, PB & Console, C Code w/C4 & 3.55 8 rear, If you aren't using the GT40P's stock, with maybe a spring upgrade and valve job, they aren't worth it anymore. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. Click to reveal Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. As usual, there is much more to this story. just curious. For all of us interested in Gt40p heads. Compare. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Im now thinking of adding a cam to match the carb. 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. And remember ENGINES have been being built/rebuilt/modified for years. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. Through Central Coast you can have the heads fully prepped for your combination. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. Ill do springs and a moderate cam and go for a good, dependable power plant. made more power everytwhere and 40 hp is respectable. Weiand 7515 xcellerator intake. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. The gt40p head is considered the best OEM 302 head made. 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. All manufactured using advanced CNC technology for the extreme durability and precision required of the modern canted valve Ford Small Block at power levels around the 1000 mark reached during recent competitions at the EMC and at the strip. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. You keep stock drivability, and stock gas milage if you can stay out of boost. 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 cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. I have a 5.0 from a 1992 Mustang in my 65. Gt40 heads/intake from a jy explorer, leave the . 69.90.139.244 Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. I am working on a set of iron GT40s hoping it goes faster. Even with a stock Mustang 5.0 cam makes good power. JEGS High Performance. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. All costing in the end at least another $2k. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. However, theres a distinct possibility that I might pull all of my hair out if I see another in-depth article explaining how I, along with just over a billion other desperate humans seeking answers, need special valve spring split locks for my next tired Chevy build. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. Those are really good numbers. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Then why did you port the heads and how do you know if you made an improvement. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. I love my setup and it is very strong engine. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. That's a good combo in my book. No-option stripper- I like strippers. Mar 23, 2004. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. Holten runs the factory fan, but he had removed it when he ran the 12.63. This is a function of the somewhat wider lobe-separation angle of 112 degrees. 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. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Manual trans. 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 newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. Here a comparison of different heads on a 302: I'm very happy with my GT40P. A COMP hydraulic roller cam we found works well with this combination. GT40s have 64cc chambers. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. Test 3: Installed the larger Lunati camagain, no other changes. Slover primarily focused on the exhaust side of the GT40P heads. JavaScript is disabled. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. PTP Engineering front suspension and 25540R17s all around. However I think the opportunity window is slowly closing. . Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings.