H0w much to mill to get 11.1 compression
11-12-2008, 10:43 PM
#1
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H0w much to mill to get 11.1 compression My SCR calculator got deleted can someone tell me how much do I have to mill stock Ls1 heads to get 11.1 compression on stock block.
11-13-2008, 05:20 PM
#3
62cc chambers will net you right at 11.0:1 on a stock LS1 short-block with a GM MLS head gasket.
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COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
03-09-2010, 11:02 AM
#4
Use this calculator: http://www.rbracing-rsr.com/compstaticcalc.html
Stock LS1...
Bore: 3.898"
Stroke: 3.622"
Head gasket thickness: 0.051"
Deck height: ~0.006"
Piston top volume: 0cc
Combustion chamber volume: 66.67cc
Now change the Combustion Chamber volume to 59cc and see what compression ratio that gives you.
Head gasket thickness from GM Perfromance catalog p.210:
Last edited by 35thAnniversaryPhil; 03-09-2010 at 11:26 AM.
03-09-2010, 05:41 PM
#5
Milling .007 off the deck = about 1CC on LS heads so do the math, that's with no CNC work done to the chambers. 241 heads are about 66C chambers so that should give you a good starting point. 59CC chambers will net you 11.5:1 this I know because I had 241 heads w/ 59CC chambers. Your looking at 62 to 61CC chambers for your 11:1
