1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. Limited header choice is certainly a challenge. Without changing the stock pistons. 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. Your IP: Just got through porting one of my gt40p heads today. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. This time around, we chose a shining example of this junkyard art form. Here is my setup. Speedmaster PCE281.2046 Small Block Ford Aluminum Cylinder Heads 62cc The GT40P heads flow a lot better than stock 351 heads. 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. The specs are a conservative 212/218 degrees of duration at 0.050-inch tappet lift but offer a really nice 0.512-inch valve lift for both the intake and exhaust. Trick Flow Mustang Valve Spring Upgrade Kit - Cast Iron Head (79-95) I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. For the most part 302 heads and 351W heads are the same. Good on ya Jeff Smith. A bit of info for those looking to build 300+hp 5.0L/302s Im a different animal. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? These are Ford iron GT-40P heads. GT40s have 64cc chambers. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. Purchase a set of flat top pistons (from Ford Motorsport, TRW or Keith Black) with machined valve reliefs and designed to provide 10:1 compression with a 59 to 60 cc combustion chamber cylinder head. 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. 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? Install a set of 1.7:1 roller-tipped rocker arms on the heads. The reply has so many assumptions that I cant even assume to know the answer. 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. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. #1:::Throw out all your Magazines that suggest what to do! I've got gt40p heads for it I'll be running, and can't afford better . Install a set of 1.7:1 roller-tipped rocker arms on the heads. So I've got the motor and heads already for my maverick project. AFR 165cc 58cc Heads. If they are cheap enough, take them anyway. In less than an hour, we were ready to test. I had a set of 69 302 heads I ran for a while . This is a function of the somewhat wider lobe-separation angle of 112 degrees. Budget 300HP 302 Build They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. These heads have been remanufactured using refaced reclaimed Factory Valves. 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. 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. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? 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. 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 action you just performed triggered the security solution. 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. GT 500; Posts: 8496; Location: Brisbane . 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. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. HiPo manifolds and Ill be good. 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. A LOT of them do it these days. Required fields are marked *. Maybe I'll think about a cam swap? 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. But dont think that adding a bigger camshaft will make more power. We also discovered some issues with the GT40P heads that required changes, so we added valves from Manley that eliminated the exhaust-valve rotators and allowed us to set the proper valvespring installed height. The hardest part of swapping the cam was just getting the timing cover off and back on again. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Long tube headers are a terrific idea, but you need to open up the exhaust side. Not to mention, they will run circles around GT40P's out of the box. 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. You can have your current 28 oz rebalanced to 50. Choosing pistons to complement GT40P heads - MustangWorks.com The best thing to do would be to use a specific break-in oil for the first 200 to 300 miles of use to reduce the change of a potential problem with undue wear. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. Where they differ is the combustion chamber size. This is not a criticism but instead consider it to be more of a heads-up. Performance & security by Cloudflare. This will keep you from dropping your overall static compression ratio and losing power. Yea. Because its all been done time after time after. But the part about a cam replacement possibly being a labor intensive undertaking is correct. 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. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. As with all head installations, check piston-to-valve clearance before final startup. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. 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. However, since Holten's car has an E303 cam, we didn't want the pistons and valves becoming too close, so we chose the 1.6 rockers. 289 or 351 heads on a 302 advantage? | The H.A.M.B. You'll have to plug the oil hole that is in the engine from the old oil dipstick. We've already been motivated to put this engine in a buddy's Mustang. A good port job can set you back another $500-$1,000. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. No-option stripper- I like strippers. GT-40 heads HP increase | Mustang Forums at StangNet Sponsored. Never not once have I ever seen a SBF rod bolt create a failure. They work, but present their own challenges. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. With nitrous, this is easily a mid-11-second ride. Sponsored. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. 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. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). 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. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Very true about finding them at the local yards. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. gt40p headers | Maverick/Comet Forums '85 GT vert two tone (white on charcoal)white leather, http://www.facebook.com/groups/233213650060739/, http://www.summitracing.com/parts/TFS-2500100/, ascMcLaren & Motorsport/Grand Prix IV Capris, RHD and Other International/Export Models, Mods, Maintenance & Mechanical FAQs/Archive, If this is your first visit, be sure to Be careful, I was once bitten by one of those reptile engine builders. Free shipping. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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. Thanks. The only one that's close, is #7. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. $169.50. Ported Hurricane Single Plane and custom 750 HP. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. 1 - 7 of 7 Posts. If you're running a stock cam, 1.7 rockers will work perfectly. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. You keep stock drivability, and stock gas milage if you can stay out of boost. 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. 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. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . Consider having the head's intake ports matched to the intake manifold gasket. . $700.98. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend ***Most important is theStupid question is the one that was never asked!*** Anyways, I know the gt40ps will bump . Those are really good numbers. Save narve00 Their weak point is that the rotator used on the exhaust valve is very thick. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. With. 331/347 stroker w/gt40p's, waste?Hp?cost involved? - Maverick - I have a 1989 f150 with a 302 5 spd. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. GT40P Heads how much hp from them. - StangNet He'd be the best source. That's an improvement of 22 hp over Test 2. Ill do springs and a moderate cam and go for a good, dependable power plant. Good Luck. GT40 vs GT40P: Who has Smaller Chamber Volume ! More compression Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. These timeslips are from 1280' above sea level. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The gt40p head is considered the best OEM 302 head made. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. 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. Calculating pushrod length REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS | What's New Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. 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. JavaScript is disabled. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. This test went so well that we were eager to see what the slightly bigger cam would do. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! That's fantastic for the minimal investment we made. They fill that spot between power and budget. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. Step 1. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. I got a GT40P off the assembly line years ago. 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. $700.98. No-option stripper- I like strippers. I view the GT40P heads similar to Granada brakes. 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). Not looking for crazy HP. Nice to see actual dyno results instead of "butt dyno" guesses. 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. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Boy, were we surprised with the results. 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. the springs are new stock oem ford. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. (Please note these are not GT40P Explorer heads). $139.99. Yes- thank you. will gt40p heads fit on a 302 | Ford Mustang Forum 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. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Like I said lots of options. 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. 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 costing in the end at least another $2k. You can have your current 28 oz rebalanced to 50. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. The "P" heads flow better. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Ive been building ENGINES for 40+ years. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Do you guys have part numbers for the spring kits? E303 Cam advanced 4 degrees. 68 XR7 & 68 M-100. What Are The GT40 & GT40P Heads? - LMR.com Then why did you port the heads and how do you know if you made an improvement. We know what you're thinking--only two-tenths from an extra 45 hp? +1 I would go with the regular GT40 heads. Now he serves as a regular contributor to OnAllCylinders. If you have a early 351W ie pre 76 it probably . could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? 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. 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. Take the assembly to a machine shop to have it balanced and install it in the block. 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. 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! It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. I spin it to 6500 and thats about it. 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. You just want to keep it out of detonation. JavaScript is disabled. by travis Sun May 03, 2020 8:33 am. Location: Re: Stock Ford 351W 4bbl dyno numbers. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. Overview. Best of all, no machining is required to install these on your stock cast iron heads! Shop by category. This is the main reason why these engines are not modified as much as the small block Chevy. this is the price for one head. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. That's a good combo in my book. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. 99 Explorer engine (302) with GT40P heads - Ford Muscle Cars Tech Forum Anythoughts? There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. 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. This is just a quick overview of the changes that need to be done. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. Supercharging GT40p heads | Modded Mustang Forums . The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. gt40p heads on a 289 in a 66 | Vintage Mustang Forums I added a link to it. For a better experience, please enable JavaScript in your browser before proceeding. http://vb.foureyedpride.com/showthread.php?t=89153, http://www.facebook.com/groups/233213650060739/, ascMcLaren & Motorsport/Grand Prix IV Capris, RHD and Other International/Export Models, Mods, Maintenance & Mechanical FAQs/Archive, If this is your first visit, be sure to Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. Holley 670 street avenger carb. Theres many options available for a little more power. Worst AFR 165 dyno ever | Factory Five Racing Forum The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. Motor is going into a Ranger. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. (Image/Harrison Creamery). i'd love to use these heads,. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. 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. Choose a cylinder head before you install the pistons. 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. GT40P heads? how hard to put on? how much HP and torque? GT40 Heads On A 289? | Ford Muscle Cars Tech Forum 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. All this is worth it. The Fora platform includes forum software by XenForo. I am very happy too. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. The only way to really make more power is to go with a stroker kit, blower and/or heads. Those heads were unported and had stock valve sizes! 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. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. For a better experience, please enable JavaScript in your browser before proceeding. Ask Away! with Jeff Smith: Camshaft and Cylinder Head Recommendations The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Free shipping for many products! Dyno results GT40P heads | Vintage Mustang Forums Assorted screwdrivers, pliers and vise-grips. at the crank. 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. 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.
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