Quote:
Originally Posted by Ol' Ron
Yes, you can use a tighter piston to head clearance, if you use a lighter piston. The heavy 4 ring pistons have a tendency to stretch the rods a little. Especially is you running a good cam at run over 5000 RPM;s Just remember ONE thing: There;s always a reason for making a modification. Some work, some don't.
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I sometimes wonder about "rod stretch". Is a rod elastic enough to stretch at high RPM and return to original length? Or could the crankshaft be flexing enough to allow piston contact? Has any research been done on this?