I'll save the effort and lighten my front end by 50# with aluminum. He'd be the best source. I got a set of AFR heads , night and day. Ha! Stock 1989 5.0L HO pistons will work if you can find them. 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. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. While the heads were off getting a massage, we turned our attention to the cam timing. Step 1. 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. 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. JEGS High Performance. Gt40 heads/intake from a jy explorer, leave the . I must agree with Jeff Smith. 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. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. It runs smooth but seems lazy. Have fun, be safe, enjoy. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. But dont think that adding a bigger camshaft will make more power. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. Check my post above. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. 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. Win or lose, if you buy the ticket you must take the ride. 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. Choosing pistons to complement GT40P heads - MustangWorks.com Max hp out of gt 40 heads | Mustang Evolution Forum I have been working on Fords for 40 years and I have experimented with a few tricks of my own. 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. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. 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. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. 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. 69.90.139.244 Assorted screwdrivers, pliers and vise-grips. $930.00 + $55.00 shipping. Mac and Ford Motorsport both make a GT40P spacific header. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. A good port job can set you back another $500-$1,000. GT40P heads, what kind of performance do they give? That's an improvement of 22 hp over Test 2. Choose a cylinder head before you install the pistons. A trip to Orlando Speed World provided us with updated quarter-mile times. Yea. 1983 Mustang G.T. Best of all, no machining is required to install these on your stock cast iron heads! Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. 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. It turned out we were conservative on both counts. $700.98. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. You can use the stock roller lifters with any size cam you want. 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. Fastest e303 5.0l's? - FourEyedPride.com Free shipping for many products! For a better experience, please enable JavaScript in your browser before proceeding. 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. Very true about finding them at the local yards. just curious. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. The Fora platform includes forum software by XenForo. So I've got the motor and heads already for my maverick project. Your IP: 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. 99 Explorer engine (302) with GT40P heads - Ford Muscle Cars Tech Forum 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. 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. 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. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. These are a great head but do need some machining mods to make they really work well. Also, the spark plug angle makes it a pain. 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. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) FORD, SMALL BLOCK 302 HO w/ E7, GT40P & GT40 - Alex's Parts Torque on the other hand isnt something to write home about. 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. Your email address will not be published. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. T5 with 3.73s. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. 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. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts We probably could have coaxed an even 300 hp out of this stock configuration, but with such good numbers, we decided to jump right into the first Lunati cam. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Using the manufacturer recommended springs for your camshaft are a safe bet. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! hole size 302 is 7/16 and 351 is 1/2 Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. No-option stripper- I like strippers. Because of this, your tuneup will probably need to be modified. Nudge us with emails, and we'll make it happen. What Cam and Springs to Use for GT40 Heads Buy the lifters for peace of mind now and hopefully for the duration. Sponsored. Finding Gt40p heads at the junkyard is getting more and more complicated and if you want to upgrade the heads you have to take into account the costs of the machine shop and compare everything to a set of cheap aluminum heads. 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. Yes- thank you. check out the. 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. Maybe I'll think about a cam swap? 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. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? You need to check. Thanks. Tim's junkyard refugee survived the beating and we had a bitchin' story. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. Install a set of 1.7:1 roller-tipped rocker arms on the heads. I was looking at putting on the GT40P heads on. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. this head fits years 95-01 explorer mountaineer mercury mountaineer . Ford Factory 5.0 Performance Cylinder Heads. 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. That's fantastic for the minimal investment we made. Again, assuming this is a nearly stock 5.0L with stock heads, the Weiand Street Warrior dual plane intake and 600 cfm carburetor, its important to not become overly aggressive and choose a big camshaft. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. 02-11-2012, 07:16 PM #6 fiveoh 86lx The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. This is a function of the somewhat wider lobe-separation angle of 112 degrees. They also have emissions legal heads as well. How much HP and torque do you think I. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. You could run a thinner head gasket as well. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. Those heads were unported and had stock valve sizes! These timeslips are from 1280' above sea level. Really hurt too. With. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. Because its all been done time after time after. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. Without changing the stock pistons. GT40 vs GT40P: Who has Smaller Chamber Volume ! More compression 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. 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. Always the weak area in the 289 and 302 is the tiny 5/16 inch connecting rod bolts and the miniscule intake and exhaust ports. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . 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. FULL DYNO RESULTS. I've got gt40p heads for it I'll be running, and can't afford better . I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. So . At the time, I was still running smog equipment in a 1994 Mustang GT, so I had them drill the back of the heads for the thermactor connection. Here a comparison of different heads on a 302: I'm very happy with my GT40P. 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. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. We need a build on a 400+ hp 302/6 build. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . 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. The combination of this cam with your intake and headers will produce a very nice street engine. 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. Stock Ford 351W 4bbl dyno numbers - Don Terrill's Speed-Talk Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. First, adding headers will improve power on the existing combination. Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend Not sure how they would mate up to your existing exhuast, but otherwise they should work. Holley 670 street avenger carb. Yea. 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. JavaScript is disabled. Sponsored. Enter your search keyword. This is not a criticism but instead consider it to be more of a heads-up. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. But don't think that adding a bigger camshaft will make more power. For a better experience, please enable JavaScript in your browser before proceeding. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. Test 3: Installed the larger Lunati camagain, no other changes. I got lucky and found a complete Explorer GT40P engine online. The asterisk HP differences are calculated using Test 1's 294-hp peak. We compare the GT40s to modern cylinder heads as well as other heads from the era. K.S. Its NA but makes use of AFR heads and some other aftermarket goodies. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. 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. The GT40P heads flow a lot better than stock 351 heads. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. We gained 45 hp and 40 lb-ft of torque. Never not once have I ever seen a SBF rod bolt create a failure. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. I recall having an absolute blast with my old K-code coupe back in the day. Keep in mind that swapping camshafts is a fairly extensive effort. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Im 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. What Are The GT40 & GT40P Heads? - LMR.com Not to mention, they will run circles around GT40P's out of the box. I had a set of 69 302 heads I ran for a while . . Through Central Coast you can have the heads fully prepped for your combination. Cant wait to try um out. 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. made more power everytwhere and 40 hp is respectable. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. The "P" heads flow better. Holten runs the factory fan, but he had removed it when he ran the 12.63. 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. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. Ford Explorer Mountaineer 5.0 Ohv Iron 302 Sbf Nice to see actual dyno results instead of "butt dyno" guesses. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. 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. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. GT40P heads? how hard to put on? how much HP and torque? The car weighs #2835 with driver. The MPH was there to run a little better but the local track is about terrible. 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. 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.
