Everything fits, use the stock rockers and pushrods. Dyno results GT40P heads | Vintage Mustang Forums . 302 heads on 351w | ClassicBroncos.com Forum With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. Along with the heads, we used MAC headers for GT-40P heads. $169.50. 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. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. However, stepping up in the performance head market will set you back more than $1,200 for a decent pair of aluminum castings--and that's straight out of the box, with no porting. 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. Most of them are aware of what changes need to be completed. 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. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) are you twisted331 also? GT-40 heads HP increase | Mustang Forums at StangNet Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. As with all head installations, check piston-to-valve clearance before final startup. E303 Cam advanced 4 degrees. So . *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. this head fits years 95-01 explorer mountaineer mercury mountaineer . However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. The later model distributors had a different diameter shaft than the earlier ones. The Fora platform includes forum software by XenForo. 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. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. What did the heads flow? Supercharging GT40p heads | Modded Mustang Forums GT40P heads, what kind of performance do they give? - FourEyedPride.com P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. They also have emissions legal heads as well. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. That's an improvement of 22 hp over Test 2. 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. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Do not ever, ever think about using the tube type manifolds. 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. The "P" heads flow better. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. GT40Ps have 58cc. What Are The GT40 & GT40P Heads? - LMR.com When building an engine there is a lot to take into consideration. this is the price for one head. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. I don't need tons of power to enjoy the car. made more power everytwhere and 40 hp is respectable. fuel injection system . After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Your email address will not be published. The MPH was there to run a little better but the local track is about terrible. 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. I'm also have the regular GT40 heads on my current build. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. FULL DYNO RESULTS. I am working on a set of iron GT40s hoping it goes faster. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. 950.00 us a set and will ship . Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? Took me 7 hours to do one head.but they cleaned up real nice. There are a couple of reasons for this suggestion. 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. Mac and Ford Motorsport both make a GT40P spacific header. All this is worth it. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. 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. At the dragstrip, we gained two-tenths and 2 mph. Well also assume that this engine is running stock exhaust manifolds. Mar 23, 2004. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. I have a very good running stock 1981 302 in a F100 short box. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. It's a classic move we've pulled off many times. Thank You. 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. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. HAD '82 GT monochromatic (red).black cloth HAVE 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. K.S. GT40, GT40P, would be great factory heads. The tube headers showed a gain of almost 100 hp! Best of all, no machining is required to install these on your stock cast iron heads! 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. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. Holten runs the factory fan, but he had removed it when he ran the 12.63. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. I got a GT40P off the assembly line years ago. GT40 Heads On A 289? | Ford Muscle Cars Tech Forum how much HP and torque? 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. The Fora platform includes forum software by XenForo. You just want to keep it out of detonation. Slover primarily focused on the exhaust side of the GT40P heads. Stock 1989 5.0L HO pistons will work if you can find them. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Obviously, tuneups will vary. Limited header choice is certainly a challenge. There's not a lot of reson to use 351 heads later than '75 since they essentially identical to 302 heads except for head bolt holes. The GT40 and GT40P cylinder heads are highly sought after, but how do they stack up against other cylinder heads, and is it worth it to upgrade the Fox Body's stock heads? Common sense would suggest that with the heavy lifting complete and the old cam removed, by not installing the new roller lifters along with the camshaft could be asking for the possibility of trouble just a few thousand miles down the road. 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. Anythoughts? I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. But dont think that adding a bigger camshaft will make more power. 02-11-2012, 07:16 PM #6 fiveoh 86lx They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. Every thing he tells you on this site is true. Here is my setup. 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. 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. GT40P heads, what kind of performance do they give? Trick Flow Mustang Valve Spring Upgrade Kit - Cast Iron Head (79-95) You can have your current 28 oz rebalanced to 50. just curious. As a final goal, we decided to bolt on a simple nitrous system and see if we could push this little small-block Ford to make some real power. Depends on the budget. 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. Thanks. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. 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. Ford 302W / 5.0L History & Specifications - The Ranger Station Well offer one as an example. We heated the bottle to 950 psi and hit the button at 4,500 rpm. 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. 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. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Never not once have I ever seen a SBF rod bolt create a failure. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. 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. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 Ask Away! with Jeff Smith: Camshaft and Cylinder Head Recommendations 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. A forum community dedicated to Ford performance owners and enthusiasts. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. LOW-BUCK 302 FORD HEAD UPGRADE - YouTube The Fora platform includes forum software by XenForo. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. 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. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Long tube headers are a terrific idea, but you need to open up the exhaust side. They work, but present their own challenges. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. Max hp out of gt 40 heads | Mustang Evolution Forum Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. i'd love to use these heads,. Not bad for off the shelf parts and a stock shortblock. 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. Holley 670 street avenger carb. Ill do springs and a moderate cam and go for a good, dependable power plant. Well assume it is a 5.0L with stock heads. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. A trip to Orlando Speed World provided us with updated quarter-mile times. Over $2050 for the 165/185 renegades. gt40p heads on a 289 in a 66 | Vintage Mustang Forums The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Motor is going into a Ranger. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. 1 - 7 of 7 Posts. If you have a early 351W ie pre 76 it probably . - I have a 1989 f150 with a 302 5 spd. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Theres many options available for a little more power. people can stop saying that adding aftermarket cam with stock heads is a waste of time. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. For 2018, the Coyote makes 460 hp. 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. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. With. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. I got lucky and found a complete Explorer GT40P engine online. Gt40p heads - FourEyedPride.com FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN I must agree with Jeff Smith. Learn how your comment data is processed. Sponsored. These are a great head but do need some machining mods to make they really work well. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. If I get different urges later, Ill pursue those then. Be careful, I was once bitten by one of those reptile engine builders. Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend They almost seem like flywheel numbers rather than RWHP numbers. The reply has so many assumptions that I cant even assume to know the answer. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. You keep stock drivability, and stock gas milage if you can stay out of boost. 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. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford 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. 302HO with gt40p heads | Mustang Forums at StangNet Because of this, your tuneup will probably need to be modified. at the crank. 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. Building 400hp Into A 5.0L Small-Block Engine - MotorTrend But the part about a cam replacement possibly being a labor intensive undertaking is correct. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. never messed with the timing, its at 35* total . 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. Junkyard Gt40p Heads-add 30+ Hp to Your 5.0l (For Free?) Click to reveal LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? I was looking at putting on the GT40P heads on. JavaScript is disabled. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! The only one that's close, is #7. 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. The car weighs #2835 with driver. 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. Ported Hurricane Single Plane and custom 750 HP. This will cost additional money but is still worth it, in our opinion. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Through Central Coast you can have the heads fully prepped for your combination. There are too many variables to add to this regarding aftermarket stroker kits or components. JavaScript is disabled. If you know him, ask him. A LOT of them do it these days. Take the assembly to a machine shop to have it balanced and install it in the block. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. #3::: Do your homework,get quality parts,dont skimp.
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