Re: forged piston clearance v4 looper
This question comes up occasionally, and with modern-day pistons, trying to figure clearance is a thing of the past, unless you know the expansion charactoristics and metalurgy of the piston. well, we don't, only the manufacturer knows, and the proper way to size is measure the cylinder as you bore to whatever oversize you intend to use based on factory specs of std. bore.<br />For example, Wiseco says for a 3.5" bore, going .020 over, bore to 3.520-3.521...the clearance is built into the piston..that info is of no use to us as rebuilders (the clearance). The factory std. bore size is the measurement we need to know.<br />Now, one exception would be when we start souping things up a bit, then it's trial and error.<br /> 85-87 120 to 140?????
