I have managed to get 402 horse power from a 289 hipo natural aspirated. 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. 289 or 351 heads on a 302 advantage? | The H.A.M.B. (Please note these are not GT40P Explorer heads). Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! 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. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. 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. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. This will keep you from dropping your overall static compression ratio and losing power. 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. Mar 23, 2004. check out the. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. The GT40P heads flow a lot better than stock 351 heads. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. Its NA but makes use of AFR heads and some other aftermarket goodies. I am very happy too. Nudge us with emails, and we'll make it happen. Ford Factory 5.0 Performance Cylinder Heads. There are too many variables to add to this regarding aftermarket stroker kits or components. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. This will cost additional money but is still worth it, in our opinion. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. HAD '82 GT monochromatic (red).black cloth HAVE 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. You gave me the info I was looking for, and I really do appreciate it. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. GT40, GT40P, would be great factory heads. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. Buy the lifters for peace of mind now and hopefully for the duration. Those heads were unported and had stock valve sizes! 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. I got a set of AFR heads , night and day. I have a 432 HP non Hi Po 289 I built. 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. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. Pretty sure that was name, but I could be wrong. 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. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. When I purchased my "brand new" set of GT40P's, I bought them from an Mustang specific machine shop that used to exist called Central Coast Mustang. The combination of this cam with your intake and headers will produce a very nice street engine. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. 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. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Ha! These are Ford iron GT-40P heads. Step 2. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. This is the main reason why these engines are not modified as much as the small block Chevy. 68stang351 Founding Member May 16, 2002 850 If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. You need to check. T5z and 3.89 9" TL rear. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. Rowe studied engineering, philosophy and American literature at Central Florida Community College. - I have a 1989 f150 with a 302 5 spd. the springs are new stock oem ford. I had those on my car before I upgraded and they were nice heads. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads Mac and Ford Motorsport both make a GT40P spacific header. The kit offers adjustable power from 50 to 250 hp with a simple jet change. Speedmaster PCE281.2046 Small Block Ford Aluminum Cylinder Heads 62cc You didnt provide a lot of information about the engine itself, Im assuming its 85 or newer ( roller cam) May need a freshen up of the bottom end if compression is the issue. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. If there isnt room without disassembling half the front clip on the car, then it might be easier to remove the engine and do the conversion that way. Motor is going into a Ranger. just curious. Never not once have I ever seen a SBF rod bolt create a failure. JavaScript is disabled. Dec 8, 2011. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. GT40P heads? how hard to put on? how much HP and torque? You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. That said there are some better aftermarket options for heads also. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. Assorted screwdrivers, pliers and vise-grips. Install a "wet" nitrous plate system (which carries both nitrous and fuel) onto the intake manifold and jet it conservatively for a 100 horsepower shot. 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. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. 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. Thanks. 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. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. The only one that's close, is #7. Over $2050 for the 165/185 renegades. 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. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Just make sure it is a roller cam. 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 . I need that part number too! The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Mild Build Gt40p I'd much rather be able to drive it at 8 or 9/10s of what it can handle. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. 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. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. The Fora platform includes forum software by XenForo. 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. The hardest part of swapping the cam was just getting the timing cover off and back on again. Definitely going to use my P heads. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. Ford 302W / 5.0L History & Specifications - The Ranger Station hole size 302 is 7/16 and 351 is 1/2 I got lucky and found a complete Explorer GT40P engine online. are you twisted331 also? When building an engine there is a lot to take into consideration. All costing in the end at least another $2k. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Gt40/gt40p Heads On A 351w Questions - StangNet 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. 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. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Yes- thank you. Yep my **** is coming apart again Isnt life great! Tim's junkyard refugee survived the beating and we had a bitchin' story. That's fantastic for the minimal investment we made. #1:::Throw out all your Magazines that suggest what to do! Slover primarily focused on the exhaust side of the GT40P heads. For a better experience, please enable JavaScript in your browser before proceeding. 1986 Short block with notched pistons. FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. First, adding headers will improve power on the existing combination. Everything fits, use the stock rockers and pushrods. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. This test went so well that we were eager to see what the slightly bigger cam would do. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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 MPH was there to run a little better but the local track is about terrible. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. 302 GT40 Dyno Results - FourEyedPride.com 02-11-2012, 07:16 PM #6 fiveoh 86lx Sure, you could race-port the existing E7 castings, which many have done, but then you're putting quite a bit of change into stock heads. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Instructions on porting the GT-40p heads here. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Free shipping. This website is using a security service to protect itself from online attacks. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. 302 with GT40 heads | Ford Mustang Forums Step 1. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. So . 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. But the part about a cam replacement possibly being a labor intensive undertaking is correct. How to Get More Horsepower Out of a Ford 289 | It Still Runs GT40P heads, what kind of performance do they give? 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. 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. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . The only way to really make more power is to go with a stroker kit, blower and/or heads. Well also assume that this engine is running stock exhaust manifolds. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Not sure how they would mate up to your existing exhuast, but otherwise they should work. this head is complete with new 1.837 int valves and 1.536 exhaust valves. 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. Keep in mind that swapping camshafts is a fairly extensive effort. Have fun, be safe, enjoy. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. And remember ENGINES have been being built/rebuilt/modified for years. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Good Luck. . 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. 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. Free shipping for many products! JEGS High Performance. You didnt mention which cam you had in mind. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. 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. SBF engines are modified constantly. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . GT-40 heads HP increase | Mustang Forums at StangNet Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. It's a classic move we've pulled off many times. We gained 45 hp and 40 lb-ft of torque. Calculated compression to 9.8:1. Most of them are aware of what changes need to be completed. JavaScript is disabled. E303 Cam advanced 4 degrees. 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? 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. Compare. GT40P Heads how much hp from them. - StangNet Well assume it is a 5.0L with stock heads. So I've got the motor and heads already for my maverick project. Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. Depending on the Headers you have you might be okay. This is what I recommend to everyone who is doing a budget 5.0 build. Like I said lots of options. gt40p headers | Maverick/Comet Forums Well that article just got me very ancy, I want these heads!! Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend Let us explain. A trip to Orlando Speed World provided us with updated quarter-mile times. A forum community dedicated to Ford Mustang owners and enthusiasts. Obviously, tuneups will vary. GT40 Heads On A 289? | Ford Muscle Cars Tech Forum BONUS TEST-FOUR DIFFERENT 302 INTAKES.. 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. the engine is carburated of that makes a difference. The "P" heads flow better. The Fora platform includes forum software by XenForo. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Scorpion 1.6 roller rockers. 68 XR7 & 68 M-100. Test 3: Installed the larger Lunati camagain, no other changes. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. 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. The action you just performed triggered the security solution. 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.