Rebuilding Engine July 10, 2007, 12:34:45 AM Well my problem started w/trying to remove the oil pan to do the oil pump.http://www.foxtbirdcougarforums.com/showthread.php?t=14748 That story being said, I ended up pulling the motor. This afternoon finished tearing it down sent the block crank pistons & connecting rods to the machine shop. I want to try and find some HP in this rebuild at the same time keeping it cheap cause my wife going to kill me. If the shop says everything checks out id like to use the same pistons and rods. machine the crank pretty much keeping the bottom stock I inquired possibly decking the block but my screw up I should of checked before pulling apart and he stated he really wouldn’t feel comfortable taking any off since last time I did my head gasket I measured .007 piston above deck.. Anyway I plan on pushing the compression envelope even further last time doing the HG milled the .020 making it about 9.5/1.. my plan is also to put as much cam as I could put in I know I sound like an idiot but I love aggressive cams and I plan in the future putting on aluminum heads for now keeping cost down ill stay w/the iron GT40s.Does anyone know from experience how far I can push a cams lift w/a stock motor? I don’t want to sound like every other ignorant idiot but just looking for a starting point. My giving is my piston deck height is +.007, 60cc gt40 that I plan on milling again and a .039 HG compressed. Quote Selected
Rebuilding Engine Reply #1 – July 10, 2007, 12:39:23 AM is this a DD? what do you have as far as other mods? im almost willing to bet, the machine shop will suggest an over bore. Quote Selected
Rebuilding Engine Reply #2 – July 10, 2007, 12:45:42 AM Quote from: 32VFoxBird;159888is this a DD? what do you have as far as other mods? im almost willing to bet, the machine shop will suggest an over bore.Yep that's what I did. Engine is .030 over (306) now. Quote Selected
Rebuilding Engine Reply #3 – July 10, 2007, 12:45:42 AM What’s a DD mean?And I’m going to try and get away w/ just honing the cylinders if he says I can so I could keep the old pistons.Pricing pistons there like in the 500 dollar range. Quote Selected
Rebuilding Engine Reply #5 – July 10, 2007, 12:55:46 AM Quote from: 32VFoxBird;159895daily driverOh no this is the weekend warrior/cruiser.and my mods were when cars was together TFS-1 cam, GT40 heads, 9.5/1 compression, GT40 intake, 70mm TB, mass air, fuel pressure reg,smog/AC delete UD pulleys cold air EGR delete,AOD w/transgo kit, 3.55 out rear, and some other small stuff i can’t think off. Quote Selected
Rebuilding Engine Reply #6 – July 10, 2007, 04:06:40 PM I don't imagine you'd be able to get much more of an aggressive cam in there if you're going to be running that little PTV clearance. The shop should be able to flycut your pistons for pretty cheap, or you could do it yourself.Here's a writeup Quote Selected
Rebuilding Engine Reply #7 – July 10, 2007, 06:48:40 PM I know my block is bored .030 over and the deck has been milled a bit but not much (I'm not sure on the exact number). With the 60cc GT40P chambers (GT40Ps have smaller chambers stock than GT40 castings. My GT40P heads were brand new and were never mounted on a motor before.) I'm right at around 10:1 compression. The cam I have has a .533 lift on both the intake and exhaust sides and the 1.84 intake valve is no where near hitting the piston. I also have flat top pistons with just valve reliefs. There is no dish in the piston just the valve reliefs. Quote Selected
Rebuilding Engine Reply #8 – July 10, 2007, 06:58:18 PM Oh, nice well in that case, this seems like a pretty solid cam that I remember MM&FF or 5.0 Mustang ranting and raving about.CompI was going to use it in a 331 build, but that should make you some pretty decent power. Quote Selected
Rebuilding Engine Reply #9 – July 10, 2007, 06:59:13 PM Quote from: thunderjet302;160052I know my block is bored .030 over and the deck has been milled a bit but not much (I'm not sure on the exact number). With the 60cc GT40P chambers (GT40Ps have smaller chambers stock than GT40 castings. My GT40P heads were brand new and were never mounted on a motor before.) I'm right at around 10:1 compression. The cam I have has a .533 lift on both the intake and exhaust sides and the 1.84 intake valve is no where near hitting the piston. I also have flat top pistons with just valve reliefs. There is no dish in the piston just the valve reliefs.just wondering, but how did you calculate your C/R?? Quote Selected
Rebuilding Engine Reply #10 – July 10, 2007, 07:21:45 PM Machiene shop did it. I'd have to call him up and get the exact numbers. I probably should at some point so I know the specs incase I ever want to change heads or get a bigger cam ect. Quote Selected
Rebuilding Engine Reply #11 – July 10, 2007, 07:57:45 PM http://www.angelfire.com/fl/procrastination/motor.htmlUsed this link (and engine spec sheet) to figure it out. Bore: 4.030Stroke: 3.00Cylinders: 8Chamber in cc's: 60Piston dome/dish: -1 (from valve reliefs)HG thickness: .039Compression ratio: 10.0641 Quote Selected
Rebuilding Engine Reply #13 – July 10, 2007, 09:03:45 PM Yep zero decked. I told him to make it as close to 10:1 as he could. I wasn't going to use a blower on it but I wanted to still be able to run it on pump gas. Biggest valve heads I can use are 1.94. Any bigger and I smack the pistons:hick: . Good thing he worked till 7:30 tonight. If not I'd have to wait till tomorrow to find all this out;) Quote Selected
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