| Measured my piston-bore clearance to be around 0.0050" (ranging from 0.0046" to 0.0058" depending on cylinder and location). Pistons are 88mm Wiseco with the numbers 6549M88 and 2981G written on it. Wiseco specifies "Most small blocks get .004 piston to wall clearance and most big blocks get .005 due to the use of our 2618 high-strength alloy. For heavy blower and nitrous applications, Wiseco recommends adding .001 to the standard clearance" I thought i was in the clear until i read this post from Ash.. [ http://www.twinturbo.net/nissan/300zx/forums/technical/view/1050770/Hi-Bezza--.html ] Are clearances like mine unacceptable?
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