Building 400hp Into A 5.0L Small-Block Engine - MotorTrend Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. $700.98. 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. Depending on the Headers you have you might be okay. 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. A forum community dedicated to Ford Mustang owners and enthusiasts. (A starter is a motor, windshield wipers use a motor,electric windows use motors) Any one uses that terminology in my shop will be corrected once, only once. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. You keep stock drivability, and stock gas milage if you can stay out of boost. 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. 1.7 shaft rockers and beehives. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. LOW-BUCK 302 FORD HEAD UPGRADE - YouTube Pride is built, in your garage, with your two hands. 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. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. GT 500; Posts: 8496; Location: Brisbane . 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . This is just a quick overview of the changes that need to be done. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. '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 If I get different urges later, Ill pursue those then. 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. Posted on May 07, 2014 by promarengine. On slicks the car went some low 7.70s right at 90mph. timing and compression ratio with gt40p heads - Modded Mustang Forums 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. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? Holley 670 street avenger carb. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. 302HO with gt40p heads | Mustang Forums at StangNet hole size 302 is 7/16 and 351 is 1/2 . Shop by category. You can have your current 28 oz rebalanced to 50. I've not seen a set of longtubes that have an issue with GT40P's, either. We know what you're thinking--only two-tenths from an extra 45 hp? Location: Re: Stock Ford 351W 4bbl dyno numbers. GT40, GT40P, would be great factory heads. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. Gt40p heads - FourEyedPride.com Gt40/gt40p Heads On A 351w Questions - StangNet Never not once have I ever seen a SBF rod bolt create a failure. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! 99 Explorer engine (302) with GT40P heads - Ford Muscle Cars Tech Forum Where they differ is the combustion chamber size. Some ideas never go out of style. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Nudge us with emails, and we'll make it happen. GT-40 heads HP increase | Mustang Forums at StangNet Budget 300HP 302 Build Holten runs the factory fan, but he had removed it when he ran the 12.63. Just got through porting one of my gt40p heads today. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . These are a great head but do need some machining mods to make they really work well. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. There are a couple of reasons for this suggestion. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. If you know him, ask him. Real world data seems to show that GT40 or GT40P cylinder heads, assuming no other mods on your Foxbody, are good to add anywhere between 20-40 HP (over stock heads). The heads that were used were also old C8 casting with 58cc chambers. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Learn how your comment data is processed. No-option stripper- I like strippers. 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. GT40P heads? how hard to put on? how much HP and torque? 351W with GT40P heads? | Mercury Cougar Owners JavaScript is disabled. All this is worth it. Holten's best time is a 12.63 at 105.9 mph, and if we gain the desired result he will be right in the thick of things in Trophy Stock competition. HiPo manifolds and Ill be good. #1:::Throw out all your Magazines that suggest what to do! Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. It turned out we were conservative on both counts. AFR 165cc 58cc Heads. I got lucky and found a complete Explorer GT40P engine online. 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. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Max hp out of gt 40 heads | Mustang Evolution Forum I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. If the head bolt holes are 1/2" or slightly larger, ARP makes the washers and can be sourced from Ford Racing or ARP through a speed shop or Summit, Jegs and PAW among others. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. The reason for this is that we're actually replacing mildly worked E7TE heads. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. I spin it to 6500 and thats about it. The older pushrod engines just dont offer the same kind of power potential for their displacement and it all has to do with cylinder head flow. 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. Its increase while significant is still only about that of a decent 351 w, hi im building a nastalgic car so im not going to drag race it but it must go ok ive got a 302 windsor basicly recoed stock but i want to run tunnel rams to go with the the3am would like to put choppy cam and replace the heads any ideas would be much apprecited thankyou, What is the stock head cc of a 1992 f150 302 windsor. I got a GT40P off the assembly line years ago. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . 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 headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. 950.00 us a set and will ship . Find many great new & used options and get the best deals for FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN at the best online prices at eBay! Ill do springs and a moderate cam and go for a good, dependable power plant. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. I got lucky and found a complete Explorer GT40P engine online. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. In less than an hour, we were ready to test. 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. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. $139.99. 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. Because its all been done time after time after. All costing in the end at least another $2k. Ask Away! with Jeff Smith: Camshaft and Cylinder Head Recommendations We took the heads to Mike Slover of Slover's Porting Service in Sun Valley, California, to do this work, plus some basic pocket-porting to improve flowespecially on the exhaust side. Then why did you port the heads and how do you know if you made an improvement. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. Ford 302W / 5.0L History & Specifications - The Ranger Station Ford Factory 5.0 Performance Cylinder Heads. I'm also have the regular GT40 heads on my current build. 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. The asterisk HP differences are calculated using Test 1's 294-hp peak. Many years ago, a friend bought a used 2001 Mercury Mountaineer 5.0L that was equipped with a set of really decent GT40P style iron heads. 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. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. That said there are some better aftermarket options for heads also. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. But dont think that adding a bigger camshaft will make more power. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. This is an older thread, you may not receive a response, and could be reviving an old thread. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! I'd get the gt40 setup, and put an s trim on it. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. The longer duration created a slight loss of torque below 3,300 rpm compared to both previous cams, but beyond that mild loss of power, the bigger Voodo out-powered its smaller cousin, cranking out a peak torque of 355 lb-ft at 4,300 (a gain of 7 lb-ft over Test 2) and charging to a peak horsepower of 376 at 6,000 rpm. 302 heads on 351w | ClassicBroncos.com Forum Stock Ford 351W 4bbl dyno numbers - Don Terrill's Speed-Talk That's fantastic for the minimal investment we made. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. Mac and Ford Motorsport both make a GT40P spacific header. Using the manufacturer recommended springs for your camshaft are a safe bet. 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. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? Eldelbrocks Air Gap intake manifold should work well with the combination. These heads have been remanufactured using refaced reclaimed Factory Valves. Calculated compression to 9.8:1. Install a set of 1.7:1 roller-tipped rocker arms on the heads. You just want to keep it out of detonation. $700.98. This is the main reason why these engines are not modified as much as the small block Chevy. 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. Weiand 7515 xcellerator intake. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. HAD '82 GT monochromatic (red).black cloth HAVE However I think the opportunity window is slowly closing. 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. 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. 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. Calculating pushrod length You can have your current 28 oz rebalanced to 50. The GT40P heads flow a lot better than stock 351 heads. Once the headers are in place, then you can consider if you still want more power. This engine will be good for your 65 Mustang. 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. Yea. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. Both swaps made more sense when parts were readily available at the bone yard for cheap. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. I had those on my car before I upgraded and they were nice heads. An aggressive cam will wake it up a bit. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. 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. Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts If you dont feel comfortable doing this higher a pro. GT40 Heads On A 289? | Ford Muscle Cars Tech Forum 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.