I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Pretty sure that was name, but I could be wrong. 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. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. 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. Long tube headers are a terrific idea, but you need to open up the exhaust side. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Because of this, your tuneup will probably need to be modified. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . The valve seats have been cut on a . Not looking for crazy HP. Very true about finding them at the local yards. What did the heads flow? Yep my **** is coming apart again Isnt life great! Compare. With no other changes we gained 25 hp using factory iron heads. Cloudflare Ray ID: 7a2e2d95dedea1e4 Richard Rowe has been writing professionally since 2007, specializing in automotive topics. Eldelbrocks Air Gap intake manifold should work well with the combination. If they are cheap enough, take them anyway. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. A forum community dedicated to Ford performance owners and enthusiasts. Because its all been done time after time after. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. 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. JavaScript is disabled. are you twisted331 also? Take the assembly to a machine shop to have it balanced and install it in the block. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. The combination of this cam with your intake and headers will produce a very nice street engine. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. I got a set of AFR heads , night and day. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Keywords I got lucky and found a complete Explorer GT40P engine online. Well assume it is a 5.0L with stock heads. 1979 Indy 500 Pace Car. Stock 1989 5.0L HO pistons will work if you can find them. Do not ever, ever think about using the tube type manifolds. The later model distributors had a different diameter shaft than the earlier ones. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. 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. 1983 Mustang G.T. The asterisk HP differences are calculated using Test 1's 294-hp peak. 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. 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. This is an older thread, you may not receive a response, and could be reviving an old thread. 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. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Free shipping. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Anyways, I know the gt40ps will bump . In less than an hour, we were ready to test. But don't think that adding a bigger camshaft will make more power. This test went so well that we were eager to see what the slightly bigger cam would do. Compare. Limited header choice is certainly a challenge. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. FULL DYNO RESULTS. #1:::Throw out all your Magazines that suggest what to do! T5z and 3.89 9" TL rear. It's a classic move we've pulled off many times. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. Im now thinking of adding a cam to match the carb. Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. Thanks. 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 had a set of 69 302 heads I ran for a while . The hardest part of swapping the cam was just getting the timing cover off and back on again. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. Consider having the head's intake ports matched to the intake manifold gasket. The car weighs #2835 with driver. Where they differ is the combustion chamber size. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. Maybe I'll think about a cam swap? Depending on the Headers you have you might be okay. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. this head is complete with new 1.837 int valves and 1.536 exhaust valves. But the part about a cam replacement possibly being a labor intensive undertaking is correct. 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. That's more than enough to feed a power-brake booster. If you're running a stock cam, 1.7 rockers will work perfectly. If you know him, ask him. 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. 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. Also, the spark plug angle makes it a pain. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. We gained 45 hp and 40 lb-ft of torque. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! That said there are some better aftermarket options for heads also. I have heard this rod bolt weakness myth for years but have yet to have a single problem with them in any of the SBF engines I have pounded on for the last 30 years and there have been lots of them. A good port job can set you back another $500-$1,000. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. . 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. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. 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. It turned out we were conservative on both counts. Nudge us with emails, and we'll make it happen. Posted on May 07, 2014 by promarengine. Those heads were unported and had stock valve sizes! After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Overview. K.S. Even with a stock Mustang 5.0 cam makes good power. What would be the best cam and springs to use for these heads in a 302 Windsor? I'm new and I'm currently building a 302 on a budget and want to raise compression without milling heads but by pistons and I want to get close to 10:1. If you have a early 351W ie pre 76 it probably . 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. 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. 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. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. These engines came with the GT40P head, which even with its small valves, offers really good performance. 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? 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. An aggressive cam will wake it up a bit. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Just got through porting one of my gt40p heads today. 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. These are a great head but do need some machining mods to make they really work well. 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. 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. Free shipping for many products! 68 XR7 & 68 M-100. Slover primarily focused on the exhaust side of the GT40P heads. 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. 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. how much HP and torque? ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. Do you guys have part numbers for the spring kits? Ported Hurricane Single Plane and custom 750 HP. A trip to Orlando Speed World provided us with updated quarter-mile times. However there are plenty of factory heads that with the help of an experienced machine shop can be great. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). This is not a criticism but instead consider it to be more of a heads-up. Thank You. 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. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. I had those on my car before I upgraded and they were nice heads. I got rid of the carburetor and went with a F.A.S.T. Car Craft mag. 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. Boy, were we surprised with the results. Ford Factory 5.0 Performance Cylinder Heads. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. This will keep you from dropping your overall static compression ratio and losing power. These timeslips are from 1280' above sea level. Well that article just got me very ancy, I want these heads!! 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. 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. Well offer one as an example. You can have your current 28 oz rebalanced to 50. All this is worth it. HAD '82 GT monochromatic (red).black cloth HAVE 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 . There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. And remember ENGINES have been being built/rebuilt/modified for years. 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. 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. 02-11-2012, 07:16 PM #6 fiveoh 86lx I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! The 5.0L with the GT40 head had a 9.0:1 compression, and the 5.0L with the GT40P head had 9.1:1 compression. 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. hole size 302 is 7/16 and 351 is 1/2 JavaScript is disabled. 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? $700.98. Gt40 heads/intake from a jy explorer, leave the . Buy the lifters for peace of mind now and hopefully for the duration. that is a healthy budget deal. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. Torque on the other hand isnt something to write home about. 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. I'd get the gt40 setup, and put an s trim on it. $169.50. Because of this, your tuneup will probably need to be modified. The kit offers adjustable power from 50 to 250 hp with a simple jet change. This is what I recommend to everyone who is doing a budget 5.0 build. With nitrous, this is easily a mid-11-second ride. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. 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. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. GT40P heads, what kind of performance do they give? Related Resources Mustang Generation Nicknames: What Do They Mean? We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. 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. This will cost additional money but is still worth it, in our opinion. I just read about this build on the corral.net. Im a different animal. Calculating pushrod length . The GT40P heads flow a lot better than stock 351 heads. These are some of the pictures I have showing the Explorer manifolds. They fill that spot between power and budget. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . 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. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. people can stop saying that adding aftermarket cam with stock heads is a waste of time. 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 turned it because it was tired when I got it. GT40, GT40P, would be great factory heads. You can use the stock roller lifters with any size cam you want. 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. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Along with the heads, we used MAC headers for GT-40P heads. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. You gave me the info I was looking for, and I really do appreciate it. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. AFR 165cc 58cc 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. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. E303 Cam advanced 4 degrees. THANKS VERY MUCH! 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. Now he serves as a regular contributor to OnAllCylinders. But dont think that adding a bigger camshaft will make more power. 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. You could run a thinner head gasket as well.

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