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DonE DonE is offline
Wo ist die Rennstrecke?
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Join Date: Mar 2004
Location: Brooks, GA
Posts: 1,211
Originally Posted by Outlaw 911 View Post
4 Bump in compression - maybe - if I find the piston/cylinder out of spec - use new pistons - otherwise I might stay with what I have, shave the heads to get a a .5 bump in CR and run slight higher boost?
Outlaw 911
I bought my 930 from a guy who shaved the heads to bump the compression .5. He did not (nor did I) take into consideration that the heads (and consequently the cams) are now closer to the crankshaft which put a fair amount of slack into the cam chains. After initial chain stretch (from being new), the stock cam chain tensioners were topped out and could not remove any more slack. I had to buy oversized idler pulleys from Jerry Woods to take out the slack. I could not increase cylinder shims because the deck height was correct with the shims I used (DON'T screw with deck height).

If you're willing to do this upfront, OK. Otherwise go with custom pistons and be done with it.
Old 10-26-2009, 06:40 PM
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