302 with gt40p heads horsepower23 Apr 302 with gt40p heads horsepower
The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. the engine is carburated of that makes a difference. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. Take the assembly to a machine shop to have it balanced and install it in the block. 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. Well offer one as an example. Choose a cylinder head before you install the pistons. 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. The GT40P heads flow a lot better than stock 351 heads. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. 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. It runs smooth but seems lazy. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. 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! JavaScript is disabled. We bolted the Ford to the dyno with a set of 158-inch long-tube headers and an 18-inch collector extension to help the low-speed torque, then we fired up the small-block. This is needed for the steel roller cam. We compare the GT40s to modern cylinder heads as well as other heads from the era. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. I am working on a set of iron GT40s hoping it goes faster. I'll save the effort and lighten my front end by 50# with aluminum. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. Nice to see actual dyno results instead of "butt dyno" guesses. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. 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. Well that article just got me very ancy, I want these heads!! The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. Free shipping for many products! GT40P heads, 302 and Victor Jr. intake: - Factory Five Racing Forum The Fora platform includes forum software by XenForo. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. On slicks the car went some low 7.70s right at 90mph. $139.99. The kit offers adjustable power from 50 to 250 hp with a simple jet change. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. That's more than enough to feed a power-brake booster. 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. Your email address will not be published. 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. This will cost additional money but is still worth it, in our opinion. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. JavaScript is disabled. That said there are some better aftermarket options for heads also. We know what you're thinking--only two-tenths from an extra 45 hp? Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Holten's best time is a 12.63 at 105.9 mph, and if we gain the desired result he will be right in the thick of things in Trophy Stock competition. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Gt40 heads/intake from a jy explorer, leave the . You could run a thinner head gasket as well. The only one that's close, is #7. He'll have to get a gear for his distributor. 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 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. Without changing the stock pistons. Compare. Ha! I added a link to it. E303 Cam advanced 4 degrees. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Related Resources Mustang Generation Nicknames: What Do They Mean? I had a set of 69 302 heads I ran for a while . These are some of the pictures I have showing the Explorer manifolds. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. The car weighs #2835 with driver. There are too many variables to add to this regarding aftermarket stroker kits or components. But don't think that adding a bigger camshaft will make more power. 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. For a better experience, please enable JavaScript in your browser before proceeding. 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. I spin it to 6500 and thats about it. Performance & security by Cloudflare. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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. The only way to really make more power is to go with a stroker kit, blower and/or heads. check out the. The reply has so many assumptions that I cant even assume to know the answer. Instructions on porting the GT-40p heads here. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. Joined . Best of all, no machining is required to install these on your stock cast iron heads! I guess I had it backwards, sorry about that, didn't mean to spread misinformation. We heated the bottle to 950 psi and hit the button at 4,500 rpm. 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. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. With no other changes we gained 25 hp using factory iron heads. Calculated compression to 9.8:1. Because of this, your tuneup will probably need to be modified. Shop by category. Ported Hurricane Single Plane and custom 750 HP. (its not their engine) You just want to keep it out of detonation. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. 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. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. Real world data seems to show that GT40 or GT40P cylinder heads, assuming no other mods on your Foxbody, are good to add anywhere between 20-40 HP (over stock heads). Then why did you port the heads and how do you know if you made an improvement. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Boy, were we surprised with the results. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 We gained 45 hp and 40 lb-ft of torque. 99 Explorer engine (302) with GT40P heads - Ford Muscle Cars Tech Forum Worst AFR 165 dyno ever | Factory Five Racing Forum 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! how hard to put on? Motor is going into a Ranger. As with all head installations, check piston-to-valve clearance before final startup. They also have emissions legal heads as well. I got lucky and found a complete Explorer GT40P engine online. The only failures Ive had were timing chains and a couple broken rods in a mid 80s 302 with 200,000 miles on it that got about 35 lbs of boost stuffed into it when a pop off valve I bought on ebay failed. Required fields are marked *. Also, the spark plug angle makes it a pain. This is a function of the somewhat wider lobe-separation angle of 112 degrees. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. 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. 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. That's fantastic for the minimal investment we made. Obviously, tuneups will vary. 1986 Short block with notched pistons. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. Because its all been done time after time after. Depending on the Headers you have you might be okay. The later model distributors had a different diameter shaft than the earlier ones. You need to check. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. GT-40 heads HP increase | Mustang Forums at StangNet Tim's junkyard refugee survived the beating and we had a bitchin' story. I have a 66 mustang with its original untouched 289 with over 140 k on it that Ive been running a blow thru turbo making 14 lbs of boost on for the last 5 years and its never given me a problem. any input is apprecciated:smartass: Thank you for the info, if all I have to worry about is the plugs then I'm in good shape hahaha. The asterisk HP differences are calculated using Test 1's 294-hp peak. Now he serves as a regular contributor to OnAllCylinders. Both swaps made more sense when parts were readily available at the bone yard for cheap. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. They almost seem like flywheel numbers rather than RWHP numbers. For 2018, the Coyote makes 460 hp. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. by travis Sun May 03, 2020 8:33 am. Here is my setup. The valve seats have been cut on a . The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. Really hurt too. I wouldnt recommend reusing lifters though. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. 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. 331/347 stroker w/gt40p's, waste?Hp?cost involved? - Maverick The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. check out the. Add 40 to 70 HP to your 302 yourself - Factory Five Racing Forum At the dragstrip, we gained two-tenths and 2 mph. I was looking at putting on the GT40P heads on. This is what I recommend to everyone who is doing a budget 5.0 build. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN 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. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads built one using a 91' HO short block with a set of AFR 165 heads, Weiand . If they are cheap enough, take them anyway. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Runs well. There is a better way. 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. Do not ever, ever think about using the tube type manifolds. 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. 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. Maybe I'll think about a cam swap? AFR 165cc 58cc Heads. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. Assorted screwdrivers, pliers and vise-grips. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Step 2. I am very happy too. Not to mention, they will run circles around GT40P's out of the box. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. I've not seen a set of longtubes that have an issue with GT40P's, either. 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 Fora platform includes forum software by XenForo. However realistically, with the amount of money spent modifying the gt40p heads or even those older 289 & 351w heads, you could have even better performing aluminum heads. (Please note these are not GT40P Explorer heads). So . SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. Most of them are aware of what changes need to be completed. Thank You. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! 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. Buy the lifters for peace of mind now and hopefully for the duration. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. I have to agree, the GT40P heads flow better than the GT40 iron heads. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. (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. 1996-2001 Ford Explorer 5.0L V8 Specifications The "P" heads flow better. 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. 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. For the most part 302 heads and 351W heads are the same. Trick Flow Mustang Valve Spring Upgrade Kit - Cast Iron Head (79-95) 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. A forum community dedicated to Ford Mustang owners and enthusiasts. Install a set of 1.7:1 roller-tipped rocker arms on the heads. 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. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. These are Ford iron GT-40P heads. made more power everytwhere and 40 hp is respectable. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. A COMP hydraulic roller cam we found works well with this combination. 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. FORD, SMALL BLOCK 302 HO w/ E7, GT40P & GT40 - Alex's Parts HiPo manifolds and Ill be good. Save narve00 You keep stock drivability, and stock gas milage if you can stay out of boost. 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. 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. 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. ***Most important is theStupid question is the one that was never asked!*** Along with the heads, we used MAC headers for GT-40P heads. Scorpion 1.6 roller rockers. But the part about a cam replacement possibly being a labor intensive undertaking is correct. Sponsored. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. that is a healthy budget deal. Never not once have I ever seen a SBF rod bolt create a failure. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. 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. JavaScript is disabled. That's a good combo in my book. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. 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. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. 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. 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. 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. All costing in the end at least another $2k. Let us explain. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. 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. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. So I've got the motor and heads already for my maverick project. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Yep my **** is coming apart again Isnt life great! fuel injection system . For all of us interested in Gt40p heads. 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. #3::: Do your homework,get quality parts,dont skimp.
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