With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. The later model distributors had a different diameter shaft than the earlier ones. You can use the stock roller lifters with any size cam you want. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. Enter your search keyword. You keep stock drivability, and stock gas milage if you can stay out of boost. No-option stripper- I like strippers. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. If you're running a stock cam, 1.7 rockers will work perfectly. The tube headers showed a gain of almost 100 hp! Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. 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. Hey all, I'm working on building a 302 with my gt40p heads. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. You can have your current 28 oz rebalanced to 50. 68 XR7 & 68 M-100. The car weighs #2835 with driver. Through Central Coast you can have the heads fully prepped for your combination. check out the. The Fora platform includes forum software by XenForo. I have managed to get 402 horse power from a 289 hipo natural aspirated. These engines came with the GT40P head, which even with its small valves, offers really good performance. The only way to really make more power is to go with a stroker kit, blower and/or heads. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. '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 Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. I have to agree, the GT40P heads flow better than the GT40 iron heads. Learn how your comment data is processed. check out the. I've not seen a set of longtubes that have an issue with GT40P's, either. Anyways, I know the gt40ps will bump . never messed with the timing, its at 35* total . A forum community dedicated to Ford Mustang owners and enthusiasts. We know what you're thinking--only two-tenths from an extra 45 hp? I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! 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. I added a link to it. We compare the GT40s to modern cylinder heads as well as other heads from the era. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. 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? A forum community dedicated to Ford performance owners and enthusiasts. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Let us explain. On slicks the car went some low 7.70s right at 90mph. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. Holten runs the factory fan, but he had removed it when he ran the 12.63. Joined: Sun Mar 15, 2009 9:31 am. 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. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). An aggressive cam will wake it up a bit. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. 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. 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. $930.00 + $55.00 shipping. So . Torque on the other hand isnt something to write home about. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. 1979 Indy 500 Pace Car. Long tube headers are a terrific idea, but you need to open up the exhaust side. 1983 Mustang G.T. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Not to mention, they will run circles around GT40P's out of the box. Every thing he tells you on this site is true. Ive been building ENGINES for 40+ years. Its always refreshing to see a FORD getting a little face time in your column, even if its a tired 302 with no great expectations of setting the world on fire when the dust settles. Hey Motorheadty,Like your comments,question for ya,I have a 92 convertible,just bought a 5.0 out of a 94 gt that was just freshened up top end,gt40p heads w/new springs etc for the new E303 cam,new FRP roller lifters,Crane 1.7 rockers,hardened push rods,double roller timing set,all put on a bottom end w/104000 miles,needless to say previous owner pulled said engine after 800 miles and now building a 351,I pulled engine down my machinest,putting forged internals in and bolting everything back together,I want to run about a 150 shot N2o,and iam going carb,wondering which intake would be best w/the 150 shot,heard that dual planes might not be the way to go? - I have a 1989 f150 with a 302 5 spd. 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. 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. This is what I recommend to everyone who is doing a budget 5.0 build. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. Definitely going to use my P 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. I had a set of 69 302 heads I ran for a while . The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. 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. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. 97% Positive Feedback . We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. 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. Just make sure it is a roller cam. Pretty sure that was name, but I could be wrong. With no other changes we gained 25 hp using factory iron heads. 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. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. It runs smooth but seems lazy. Shop by category. That said there are some better aftermarket options for heads also. 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 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. 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. 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. The valve seats have been cut on a . Im now thinking of adding a cam to match the carb. I am very happy too. at the crank. There are caveats to this plan, however. Save narve00 A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . 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 hardest part of swapping the cam was just getting the timing cover off and back on again. 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! As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? T5 with 3.73s. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. 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. The spark plug issue is almost a non-issue. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. 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. 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. 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. No-option stripper- I like strippers. These are a great head but do need some machining mods to make they really work well. That's fantastic for the minimal investment we made. The heads that were used were also old C8 casting with 58cc chambers. The asterisk HP differences are calculated using Test 1's 294-hp peak. how much HP and torque? Everything fits, use the stock rockers and pushrods. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. AFR 165cc 58cc Heads. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. That's a good combo in my book. Skip to main content. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. For a better experience, please enable JavaScript in your browser before proceeding. Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. 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 . For all of us interested in Gt40p heads. 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. Now he serves as a regular contributor to OnAllCylinders. I have a 432 HP non Hi Po 289 I built. You just want to keep it out of detonation. I must agree with Jeff Smith. Ill do springs and a moderate cam and go for a good, dependable power plant. Yea. Free shipping. Well offer one as an example. 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. +1 I would go with the regular GT40 heads. Well also assume that this engine is running stock exhaust manifolds. Because of this, your tuneup will probably need to be modified. I wouldnt recommend reusing lifters though. GT40Ps have 58cc. Calculating pushrod length 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. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. The GT40P heads flow a lot better than stock 351 heads. 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. 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. I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. He'll have to get a gear for his distributor. Mac and Ford Motorsport both make a GT40P spacific header. I love my setup and it is very strong engine. 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. This test went so well that we were eager to see what the slightly bigger cam would do. 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. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. Using the manufacturer recommended springs for your camshaft are a safe bet. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? Smith began writing for Car Craft magazine in 1979 and became editor in 1984. 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. 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. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Scorpion 1.6 roller rockers. 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. $139.99. 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.

Stephen Nolan Guests Tonight, Countries Least Affected By Climate Change, Barry Alvarez Daughters, Articles OTHER