Where they differ is the combustion chamber size. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. 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. 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. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Depends on the budget. 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. 68 XR7 & 68 M-100. For the most part 302 heads and 351W heads are the same. Tim's junkyard refugee survived the beating and we had a bitchin' story. - I have a 1989 f150 with a 302 5 spd. Limited header choice is certainly a challenge. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. HAD '82 GT monochromatic (red).black cloth HAVE You can have your current 28 oz rebalanced to 50. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. 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. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. I must agree with Jeff Smith. Your IP: They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. 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. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! The spark plug issue is almost a non-issue. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads use an external EGR connective system. Took me 7 hours to do one head.but they cleaned up real nice. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. 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. 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. For this reason, we're not sure what kind of boost the GT-40P heads will give. 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. Here is my setup. 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. 1 - 7 of 7 Posts. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 69.90.139.244 Its increase while significant is still only about that of a decent 351 w, hi im building a nastalgic car so im not going to drag race it but it must go ok ive got a 302 windsor basicly recoed stock but i want to run tunnel rams to go with the the3am would like to put choppy cam and replace the heads any ideas would be much apprecited thankyou, What is the stock head cc of a 1992 f150 302 windsor. Anythoughts? 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. 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. AFR 165cc 58cc Heads. Because of this, your tuneup will probably need to be modified. I got a set of AFR heads , night and day. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Assorted screwdrivers, pliers and vise-grips. 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. I have a very good running stock 1981 302 in a F100 short box. The only way to really make more power is to go with a stroker kit, blower and/or heads. With no other changes we gained 25 hp using factory iron heads. Do not ever, ever think about using the tube type manifolds. Yea. For all of us interested in Gt40p heads. Most of them are aware of what changes need to be completed. First, adding headers will improve power on the existing combination. Stock 1989 5.0L HO pistons will work if you can find them. 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. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. I am working on a set of iron GT40s hoping it goes faster. This is the main reason why these engines are not modified as much as the small block Chevy. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. 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. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. Once the headers are in place, then you can consider if you still want more power. You can use the stock roller lifters with any size cam you want. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. A LOT of them do it these days. 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. What Are The GT40 & GT40P Heads? - LMR.com Save narve00 Enter your search keyword. Mac and Ford Motorsport both make a GT40P spacific header. 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 may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. 1979 Indy 500 Pace Car. (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'd much rather be able to drive it at 8 or 9/10s of what it can handle. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. T5z and 3.89 9" TL rear. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. This is needed for the steel roller cam. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. Speedmaster PCE281.2046 Small Block Ford Aluminum Cylinder Heads 62cc Yeah, except those. a) ain't early and b) aren't 289 heads. What would be the best cam and springs to use for these heads in a 302 Windsor? For 2018, the Coyote makes 460 hp. A bit of info for those looking to build 300+hp 5.0L/302s $139.99. Obviously, tuneups will vary. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. 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. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. A forum community dedicated to Ford performance owners and enthusiasts. fordfan289, Aug 27, 2011 Required fields are marked *. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. 1996-2001 Ford Explorer 5.0L V8 Specifications 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. 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. This is not a criticism but instead consider it to be more of a heads-up. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. This website is using a security service to protect itself from online attacks. For a better experience, please enable JavaScript in your browser before proceeding. +1 I would go with the regular GT40 heads. 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. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . check out the. 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. 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. 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 . GT40 Heads On A 289? | Ford Muscle Cars Tech Forum i have a question once i get the gt40p heads from the explorer truck can i also take the exhaust manifolds or headers and fit them in my 66 mustang:?:!?!?!? Maybe I'll think about a cam swap? Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. If they are cheap enough, take them anyway. T5 with 3.73s. 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. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. 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. Choosing pistons to complement GT40P heads - MustangWorks.com Nice to see actual dyno results instead of "butt dyno" guesses. I have to agree, the GT40P heads flow better than the GT40 iron heads. You didnt mention which cam you had in mind. With nitrous, this is easily a mid-11-second ride. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Well offer one as an example. Upgrading Fox Body Cylinder Heads - AmericanMuscle.com You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. GT40P Heads how much hp from them. - StangNet Pretty sure that was name, but I could be wrong. Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts 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. . Seriously though if you're not planning on an all-out attack for HP, I'd consider a forged piston out of Probe's SRS line-up. Keep in mind that swapping camshafts is a fairly extensive effort. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. 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. Now he serves as a regular contributor to OnAllCylinders. Without changing the stock pistons. 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. Max hp out of gt 40 heads | Mustang Evolution Forum 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 5.0 from a 1992 Mustang in my 65. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 GT40Ps have 58cc. Our recommendation would be, rather than change the camshaft, you might want to look into adding a set of long-tube headers and a dual exhaust if the engine is not already so equipped. #3::: Do your homework,get quality parts,dont skimp. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. Ported Hurricane Single Plane and custom 750 HP. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Joined . This test went so well that we were eager to see what the slightly bigger cam would do. I need that part number too! 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. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. (Image/Harrison Creamery). 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's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. Sponsored. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. What Cam and Springs to Use for GT40 Heads GT40 vs GT40P: Who has Smaller Chamber Volume ! More compression 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. Gt40 heads/intake from a jy explorer, leave the . Scorpion 1.6 roller rockers. The MPH was there to run a little better but the local track is about terrible. But the part about a cam replacement possibly being a labor intensive undertaking is correct. That's fantastic for the minimal investment we made. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. They fill that spot between power and budget. 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. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. Mustang Cylinder Head & Camshaft Guide (79-95) - LMR The "P" heads flow better. Step 2. 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. Im a different animal. K.S. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. 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. Check my post above. how much HP and torque? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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 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. 302HO with gt40p heads | Mustang Forums at StangNet There are caveats to this plan, however. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. You can email the site owner to let them know you were blocked. GT40P heads, 302 and Victor Jr. intake: - Factory Five Racing Forum 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. 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. That's a good combo in my book. 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. These are a great head but do need some machining mods to make they really work well. There is a better way. GT40P heads, what kind of performance do they give? 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. 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 results were a major increase in power throughout the entire rev range, with an increase of 60hp at 4500rpm through to a peak of 279hp at 5800rpm. Install a set of 1.7:1 roller-tipped rocker arms on the heads. 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. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. anyone have experience with GT40P heads on a 92 351W But dont think that adding a bigger camshaft will make more power. 950.00 us a set and will ship . Worst AFR 165 dyno ever | Factory Five Racing Forum Motor is going into a Ranger. However there are plenty of factory heads that with the help of an experienced machine shop can be great. 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. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . Consider having the head's intake ports matched to the intake manifold gasket. 302 GT40 Dyno Results - FourEyedPride.com Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. Trick Flow Mustang Valve Spring Upgrade Kit - Cast Iron Head (79-95) I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. 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. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. Through Central Coast you can have the heads fully prepped for your combination. On slicks the car went some low 7.70s right at 90mph. The Fora platform includes forum software by XenForo. Definitely going to use my P heads. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. It turned out we were conservative on both counts. 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. Supercharging GT40p heads | Modded Mustang Forums A mild porting with gasket matching will be very good. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. Anyways, I know the gt40ps will bump . For a better experience, please enable JavaScript in your browser before proceeding. 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. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. 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. Well assume it is a 5.0L with stock heads. Joined: Sun Mar 15, 2009 9:31 am. Not to mention, they will run circles around GT40P's out of the box. Have fun, be safe, enjoy. The later model distributors had a different diameter shaft than the earlier ones. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 1986 Short block with notched pistons. That's an improvement of 22 hp over Test 2. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. For the cherry on top of this Blue Oval desert, we bolted Mike Thermos' simple Powerstar plate nitrous system under the carburetor, installed the 140-hp jets (55 fuel and 55 nitrous), and used the trigger to retard the timing on the MSD ignition by 8 degrees. Compare. Junkyard Gt40p Heads-add 30+ Hp to Your 5.0l (For Free?) Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. $169.50. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. . 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. 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. These are some of the pictures I have showing the Explorer manifolds. This engine will be good for your 65 Mustang. The action you just performed triggered the security solution. Yes- thank you. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN I added a link to it. If I get different urges later, Ill pursue those then. I've got gt40p heads for it I'll be running, and can't afford better . There are a couple of reasons for this suggestion. He'll have to get a gear for his distributor. 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. 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. Buy the lifters for peace of mind now and hopefully for the duration. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Calculated compression to 9.8:1. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. The car weighs #2835 with driver. 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. $700.98. 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. timing and compression ratio with gt40p heads - Modded Mustang Forums All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. Shop by category. Be careful, I was once bitten by one of those reptile engine builders. 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. I was looking at putting on the GT40P heads on. how hard to put on? 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. All this is worth it. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. LOW-BUCK 302 FORD HEAD UPGRADE - YouTube If you know him, ask him. Nudge us with emails, and we'll make it happen. Win or lose, if you buy the ticket you must take the ride. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. 68stang351 Founding Member May 16, 2002 850 Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads?
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