Compression on new shortblock
Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
Originally Posted by chriswtx
I'm doing the same..Mahle pistons with -9cc dish, H-beam rods, Hand ported 6.0L heads, stock crank, stock GM MLS 6.0 head gaskets, ARP head studs, brand new LS6 block. Shooting for 750rwhp at 14psi. It should make that easy... 
"The stock 6.0L MLS truck block cylinder head gasket is 0.038-inch thick and displaces 11 cc's" found on the net..but who knows for sure??I also found that they may be .060 compressed...also found Stock compressed 6.0L thickness is .055" with a bore of 4.080". 
Last edited by chriswtx; Apr 13, 2006 at 08:34 PM.
Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
Wow, HUGE difference between .038 and .060! #317 heads with stock displacement and -9cc mahles, just need the head gasket to get it as close to 8.5 as possible! Chris, have you run your C5 at the track this season?
Yeah, I'm traping 11.4-11.6@130mph with the 19" CCW wheels and street tires. Spinning the tires 1st-3rd gear I think they updated the head gaskest in 2002 an now they are all .55 or so
I think they updated the head gaskest in 2002 an now they are all .55 or so Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
That is absolutely sickening man. I would LOVE to hit 130mph in the 1/4! I'll have to look into the gaskets, 8.5:1 should do the trick and run great. Did you get the mahle/hbeam package from racerparts? *jealous of your C5*
Did you get the mahle/hbeam package from racerparts? *jealous of your C5*
Last edited by chriswtx; Apr 13, 2006 at 10:09 PM.
jealous of your C5
As long as I dont do anything wrong. I do all my own work, tuning and engine builds. Weekend warrior Ok, I'm just to broke to pay anyone to do it... LS1 Tech Stories
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What are you guys using for a compression calculator? I found this one. I Think it's working good.
http://www.angelfire.com/fl/procrastination/motor.html
http://www.angelfire.com/fl/procrastination/motor.html
Thread Starter
Joined: Sep 2004
Posts: 2,552
Likes: 12
From: Visalia, California
I was using the one www.classicalpontiac.com under restoration. Had been using it for years and years right after I got my 67. Thanks for that link though, basically does the same thing but metric also.
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