After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. Calculating pushrod length Hey all, I'm working on building a 302 with my gt40p heads. I have to agree, the GT40P heads flow better than the GT40 iron heads. Upgrading Fox Body Cylinder Heads - AmericanMuscle.com Long tube headers are a terrific idea, but you need to open up the exhaust side. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. at the crank. +1 I would go with the regular GT40 heads. 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. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. And have discovered something that I dont think anyone else knows. FULL DYNO RESULTS. 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. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. GT40, GT40P, would be great factory heads. Pride is built, in your garage, with your two hands. These heads have been remanufactured using refaced reclaimed Factory Valves. Mustang Cylinder Head & Camshaft Guide (79-95) - LMR 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. He'd be the best source. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. 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). It's a classic move we've pulled off many times. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. The Fora platform includes forum software by XenForo. Since the engine is nearly stock, we would want to choose a relatively mild camshaft with somewhat more lift and duration than stock, but again not going too aggressive. made more power everytwhere and 40 hp is respectable. 302 explorer short block with roughly 80k miles GT40's from a local u pull n pay ($97) weiand x-celerator trick flow stage 1 cam 650 holley double pumper car made 322/329 SAE . Install a set of 1.7:1 roller-tipped rocker arms on the heads. check out the. timing and compression ratio with gt40p heads - Modded Mustang Forums BONUS TEST-FOUR DIFFERENT 302 INTAKES.. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) This is an older thread, you may not receive a response, and could be reviving an old thread. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. 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. gt40p heads on a 289 in a 66 | Vintage Mustang Forums I love my setup and it is very strong engine. Stock heads with a fresh 3-angle valve job, shorty headers, T5, 4.10s, stock Explorer intake and stock '88 GT short block with 140,000 miles on it and an E cam in it. A good port job can set you back another $500-$1,000. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. 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 reason this new generation of Ford engines make a ton more power is they also enjoy fantastic cylinder heads and four valves per cylinder. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. Worst AFR 165 dyno ever | Factory Five Racing Forum Do not ever, ever think about using the tube type manifolds. If you're running a stock cam, 1.7 rockers will work perfectly. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. HAD '82 GT monochromatic (red).black cloth HAVE 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. 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. 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. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. Performance & security by Cloudflare. Sponsored. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. This is what I recommend to everyone who is doing a budget 5.0 build. anyone have experience with GT40P heads on a 92 351W The Fora platform includes forum software by XenForo. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. We compare the GT40s to modern cylinder heads as well as other heads from the era. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. The Fora platform includes forum software by XenForo. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . What Cam and Springs to Use for GT40 Heads Required fields are marked *. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . 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. JEGS High Performance. Gt40p heads - FourEyedPride.com I view the GT40P heads similar to Granada brakes. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. HiPo manifolds and Ill be good. 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. 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. 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. 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. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. 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. Have fun, be safe, enjoy. 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. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. Nice to see actual dyno results instead of "butt dyno" guesses. In review, we rescued a used 5.0L Ford from the boneyard, ported the heads, added a cam, carburetor, intake manifold, and headers, and pulled an amazing 376 hp out of the mix. GT-40 heads HP increase | Mustang Forums at StangNet All this is worth it. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. Always the weak area in the 289 and 302 is the tiny 5/16 inch connecting rod bolts and the miniscule intake and exhaust ports. For a better experience, please enable JavaScript in your browser before proceeding. No-option stripper- I like strippers. ***Most important is theStupid question is the one that was never asked!*** Ported Hurricane Single Plane and custom 750 HP. He'll have to get a gear for his distributor. 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. 331/347 stroker w/gt40p's, waste?Hp?cost involved? - Maverick You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Posted on May 07, 2014 by promarengine. However I think the opportunity window is slowly closing. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. A bit of info for those looking to build 300+hp 5.0L/302s This is a function of the somewhat wider lobe-separation angle of 112 degrees. Budget 300HP 302 Build That said there are some better aftermarket options for heads also. 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. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? that is a healthy budget deal. Using the manufacturer recommended springs for your camshaft are a safe bet. I'd get the gt40 setup, and put an s trim on it. GT40P heads, what kind of performance do they give? - FourEyedPride.com If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. They work, but present their own challenges. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. I am working on a set of iron GT40s hoping it goes faster. 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. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. Dec 8, 2011. How to Build a Cheap Drag Racing 302 Ford Motor | It Still Runs Runs well. Mar 23, 2004. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. 02-11-2012, 07:16 PM #6 fiveoh 86lx This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. But dont think that adding a bigger camshaft will make more power. Scorpion 1.6 roller rockers. What did the heads flow? FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN Those heads were unported and had stock valve sizes! 289 or 351 heads on a 302 advantage? | The H.A.M.B. Im a different animal. Let us explain. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. 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. Check my post above. Ill do springs and a moderate cam and go for a good, dependable power plant. 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. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. $139.99. how much HP and torque? Their weak point is that the rotator used on the exhaust valve is very thick. I think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way. 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. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. 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. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend 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. How much HP and torque do you think I. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. This is just a quick overview of the changes that need to be done. 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. You gave me the info I was looking for, and I really do appreciate it. Once the headers are in place, then you can consider if you still want more power. Compare. We heated the bottle to 950 psi and hit the button at 4,500 rpm. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Save narve00 Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. 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. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. #3::: Do your homework,get quality parts,dont skimp. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. 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. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. GT-40P Heads - 5.0 Mustang & Super Fords Magazine - MotorTrend 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. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). Gt40 heads/intake from a jy explorer, leave the . United Engine and Machine sells cheap but decent pistons that will do what you're wanting. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Never not once have I ever seen a SBF rod bolt create a failure. 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 I purchased my "brand new" set of GT40P's, I bought them from an Mustang specific machine shop that used to exist called Central Coast Mustang. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. You can use the stock roller lifters with any size cam you want. Actually the regular gt40's in either aluminum or iron are the good ones but the gt40p's are only a slight improvement over regular 302 heads. 68 XR7 & 68 M-100. Speedmaster PCE281.2046 Small Block Ford Aluminum Cylinder Heads 62cc This time around, we chose a shining example of this junkyard art form. Well that article just got me very ancy, I want these heads!! Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! When building an engine there is a lot to take into consideration. 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. Those are really good numbers. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. There are caveats to this plan, however. Mac and Ford Motorsport both make a GT40P spacific header. This is needed for the steel roller cam. We then dyno'd the car without the fan to get some consistency and were rewarded with a peak of 316 hp at 5,500 rpm, and 348 lb-ft of torque at 4,000 rpm. Keep in mind that swapping camshafts is a fairly extensive effort. At 4,300 rpm, the torque peaked at 348 lb-ft, a solid 20-lb-ft improvement, and the Lunati continued to outperform the stock cam all the way through with a peak horsepower increase of 60 hp at 354 hp at 5,700 rpm! Stock 1989 5.0L HO pistons will work if you can find them. Stock valve sizes? 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. 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. That's an improvement of 22 hp over Test 2. (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. I spin it to 6500 and thats about it. You just want to keep it out of detonation. Depending on the Headers you have you might be okay. Weiand 7515 xcellerator intake. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. 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. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? PTP Engineering front suspension and 25540R17s all around. This will cost additional money but is still worth it, in our opinion. Well also assume that this engine is running stock exhaust manifolds. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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? I've got gt40p heads for it I'll be running, and can't afford better . Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. #1:::Throw out all your Magazines that suggest what to do! 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. Also, the spark plug angle makes it a pain. Yea. 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. The car weighs #2835 with driver. I'm also have the regular GT40 heads on my current build. But don't think that adding a bigger camshaft will make more power. Install a "wet" nitrous plate system (which carries both nitrous and fuel) onto the intake manifold and jet it conservatively for a 100 horsepower shot. The gt40p head is considered the best OEM 302 head made. GT 500; Posts: 8496; Location: Brisbane . 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. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. Thank You. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 We started with a 120,000-mile 5.0L out of a Ford Explorer, removed the EFI and DIS, and pocket ported the stock GT40P iron heads with stock valve sizes. The only way to really make more power is to go with a stroker kit, blower and/or heads. people can stop saying that adding aftermarket cam with stock heads is a waste of time. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. T5 with 3.73s. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. 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. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. Not to mention, they will run circles around GT40P's out of the box. Yea. Nudge us with emails, and we'll make it happen. 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. For all of us interested in Gt40p heads. The only one that's close, is #7. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder 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. GT40P heads, what kind of performance do they give? Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! As with all head installations, check piston-to-valve clearance before final startup. 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. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . Some ideas never go out of style. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. 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. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. Skip to main content. The action you just performed triggered the security solution. Eldelbrocks Air Gap intake manifold should work well with the combination.
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