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Old 08-07-2008, 01:22 PM   #8
Scooby Newbie
Member#: 158766
Join Date: Sep 2007
Chapter/Region: South East
Location: Otown Florida
2002 WRX
2001 GSXR 750


I wouldn't run the piston closer than .035. In some class racing engines I have built in the past you get the piston to "witness" the head even at .035. No two engine parts are exactly the same so if you're getting things that close you need to treat the engine as if each cylinder were a separate engine. As far as piston to valve, you need a margin for error at some point in the engines life. I wouldn't run closer than .060 intake and .080 exhaust... Most builders like to see over .100 because of driver error. Unless it's a auto car and your keep a close eye on it race to race I wouldn't build it that close to crashing itself.
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Last edited by AndyDick; 08-07-2008 at 01:42 PM.
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