Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . What you are trying to do is to increase the amount of airflow through the engine in order to make more power. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. 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. (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. A good port job can set you back another $500-$1,000. Motor is going into a Ranger. However I think the opportunity window is slowly closing. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. 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. The gt40p head is considered the best OEM 302 head made. SBF engines are modified constantly. fuel injection 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. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. I view the GT40P heads similar to Granada brakes. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. Mac and Ford Motorsport both make a GT40P spacific header. Win or lose, if you buy the ticket you must take the ride. The kit offers adjustable power from 50 to 250 hp with a simple jet change. The later model distributors had a different diameter shaft than the earlier ones. That said there are some better aftermarket options for heads also. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Not bad for off the shelf parts and a stock shortblock. Be careful, I was once bitten by one of those reptile engine builders. A COMP hydraulic roller cam we found works well with this combination. Most of them are aware of what changes need to be completed. 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. Good on ya Jeff Smith. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. You should be able to get away with a 150 to 200 horsepower shot later, but it's best to start out small and work up. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Keep in mind that swapping camshafts is a fairly extensive effort. - I have a 1989 f150 with a 302 5 spd. 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. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 1983 Mustang G.T. Where they differ is the combustion chamber size. Learn how your comment data is processed. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Shop by category. He'd be the best source. Ford Factory 5.0 Performance Cylinder Heads. 68stang351 Founding Member May 16, 2002 850 Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. I added a link to it. 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. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. A mild porting with gasket matching will be very good. Most all long tubes come out far enough to clear and other short tube headers will work but there is clearance issues on two of the cylinders. 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. This engine will be good for your 65 Mustang. Have fun, be safe, enjoy. this head fits years 95-01 explorer mountaineer mercury mountaineer . JavaScript is disabled. Buy the lifters for peace of mind now and hopefully for the duration. This time around, we chose a shining example of this junkyard art form. For a better experience, please enable JavaScript in your browser before proceeding. What did the heads flow? Rowe studied engineering, philosophy and American literature at Central Florida Community College. Once the headers are in place, then you can consider if you still want more power. Torque on the other hand isnt something to write home about. These are Ford iron GT-40P heads. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) 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. 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! Weiand 7515 xcellerator intake. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. people can stop saying that adding aftermarket cam with stock heads is a waste of time. Keywords The tube headers showed a gain of almost 100 hp! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. how hard to put on? 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. 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. 68 XR7 & 68 M-100. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? First, adding headers will improve power on the existing combination. Both swaps made more sense when parts were readily available at the bone yard for cheap. No-option stripper- I like strippers. 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. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. That's more than enough to feed a power-brake booster. 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. 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. 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. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. The MPH was there to run a little better but the local track is about terrible. Then why did you port the heads and how do you know if you made an improvement. Stock valve sizes? Manual trans. 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. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. Mar 23, 2004. Joined . The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. We know what you're thinking--only two-tenths from an extra 45 hp? Maybe I'll think about a cam swap? I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. Just got through porting one of my gt40p heads today. Take the assembly to a machine shop to have it balanced and install it in the block. All manufactured using advanced CNC technology for the extreme durability and precision required of the modern canted valve Ford Small Block at power levels around the 1000 mark reached during recent competitions at the EMC and at the strip. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. 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. Without changing the stock pistons. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. 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. 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 heads have been remanufactured using refaced reclaimed Factory Valves. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. Depending on the Headers you have you might be okay. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! JavaScript is disabled. 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 will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! The hardest part of swapping the cam was just getting the timing cover off and back on again. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts.
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