GT40P Heads on my stock short block Reply #15 – October 27, 2008, 07:52:31 AM OK, got your pics. Here they are. It's a rebuild with .040" overbore. They APPEAR to be forged...The block is a roller block -- clean as well I might addI have no idea why the old school heads....That's a BIG combustion chamber....69cc, maybe more. You're losing about a half point or more of compression from that alone.Is the timing chain a double or a single? Quote Selected
GT40P Heads on my stock short block Reply #16 – October 27, 2008, 11:09:15 AM I haven't gotten to the timing chain, I do however have to change the gasket, it seaps coolant.The motor was a reman that I have receipts for but no specs, it should have about 20-30k miles on it. Thanks for all the help. Quote Selected
GT40P Heads on my stock short block Reply #17 – October 27, 2008, 11:10:40 AM I bet that HUGE combustion chamber is slowing you down as well..... Quote Selected
GT40P Heads on my stock short block Reply #18 – October 27, 2008, 01:23:14 PM Quote from: V8Demon;240455He has valve reliefs. And to add, plenty of guys here are running non stock cams on non-valve relief pistons......I'm one of them....they had to order different pistons for my engine,what cam are you running?mine look like his with the 4 reliefs Quote Selected
GT40P Heads on my stock short block Reply #19 – October 27, 2008, 01:32:53 PM TFS stage1 with Twisted Wedge heads......for now.Vinnie's runnin flat-tops too IIRC. Quote Selected
GT40P Heads on my stock short block Reply #20 – October 27, 2008, 02:21:21 PM mine are flat tops, with reliefs, mustve been because of the rebuild Quote Selected
GT40P Heads on my stock short block Reply #21 – October 27, 2008, 03:00:55 PM You definetly got a mixed up engine,If your not pullin the cam at least put a dial indicator on the lifters to see what the lift is.They might have milled them heads to drop the cc's. Quote Selected
GT40P Heads on my stock short block Reply #22 – October 27, 2008, 05:37:25 PM Another ? is this still SD.Or is this carbed? Quote Selected
GT40P Heads on my stock short block Reply #24 – October 28, 2008, 08:54:02 AM If this is like a Jasper motor, there is a good possibility it has an SO cam...They seem to cobble stuff together once in a while. Check lift the way Kitz described...FWIW those pistons might be hypereutectic. They don't look like a regular sand cast, they seem tight. Hyers will look similar to forged. QuoteThey might have milled them heads to drop the cc's.They're STILL huge... Quote Selected
GT40P Heads on my stock short block Reply #25 – October 29, 2008, 10:59:54 PM Well, I already put the new heads and lower intake on so I can't dial the lifters unless I tear it apart again, I was gonna verify the firing order to see if its an HO, Right now I'm held up til payday, I gotta do the timing cover gasket, drop in the new rad, tranny lines, and I gotta get around this spark plug issue on the drivers side. Plus I wanted to clean up the belt routing a bit and axe the clutch fan for an electric one. It might be a bit til I can start the thing yet.With the old setup, D8 heads, UD pulleys, cobra lower/upper and a 70mm TB, EGR/Smog/AC deleted 3.73 gears and a AOD with a B&M shift kit, the best I got out of it in the 1/8 mile was a 9.50. Its pretty consistant in the mid 9s if I don't spin too bad. I would imagine if it were indeed an SO, I wouldn't pull that but perhaps you guys know better than me.Now I still have the rest of the 99 Mountaineer motor that I pulled the heads from, Anyone know what the lower block has in it? As far as pistons and cam? I'm sure the cam is probably garbage but I'm curious what pistons ford used in those. Again, thanks for all the help and info fellas. Quote Selected
GT40P Heads on my stock short block Reply #26 – October 30, 2008, 12:54:42 PM now think with a bigger chamber you possibly could runa blower:evilgrin: since you would need to drop a bit of compression with forced induction. since you already have that going on why not add more power! Quote Selected
GT40P Heads on my stock short block Reply #27 – October 30, 2008, 02:55:34 PM QuoteNow I still have the rest of the 99 Mountaineer motor that I pulled the heads from, Anyone know what the lower block has in it? As far as pistons and cam?Hypereutectic pistons from the factory. The cam is a roller with the HO firing order with a profile designed for more low and mid range grunt due to the heavier vehicle it was designed to move. That cam is leaps and bounds above the SO cam. Runs out of steam a little earlier than the HO cam though due to the shorter duration and shorter overall lift on the intake side. Here's a chart for reference between the stock cam differences. Take note that the Explorer cam is not listed. It's cut off the page on the right side...To see how the Explorer cam comparesAdvertied duration intake 256 exhaust 266advertised lift intake .422" exhaust .448"INTAKE CLOSE 66EXH OPEN 66INTAKE OPEN 10EXH CLOSE 2030 DEG OVERLAP (BOTH)ICL 118ECL 114 LSA 116 Quote Selected
GT40P Heads on my stock short block Reply #28 – November 01, 2008, 10:57:06 PM Good bit of info. The car is indeed an HO cam, I think I'm gonna hang on to the rest of the exploder motor and possibly build a mild HO for my Bronco.Now as for the mustang, its together and running, sort of.It appears I'm running rich as all hell, it'll run fine after startup but shortly after when it goes to idle down. It stalls and is very hard to keep the car running at a light or a stop sign. I've got it at 10 degrees a .045 plug gap, 40psi fuel pressure, tps at .98 and I've screwed with the idle and I've gotten no luck, the lightshow A/F gauage reads rich all the time and we pulled the rear passenger plug because we thought it was missing, I've gotta pull another plug yet but the one was near fouled out in about 15 minutes. Any idea? Should I increase the timing or back down the fuel pressure? Quote Selected
GT40P Heads on my stock short block Reply #29 – November 01, 2008, 11:55:17 PM map sensor or maybe the coolant temp sensor. Quote Selected
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