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A lot of the so called stretch is actually expansion from heat. Just like a piston. If all these terrible things happen to an aluminum rod, why doesn't it affect pistons the same way?

I have used Hooker, Hedman, TTI, Pacemaker and flow Tech on different engines. They have all needed work to fit right. Don't take any notice of Bakerlight, he has only ever used second hand headers anyway! :D

No. just what he has heard.

But now he is 'hearing things from you. What makes your point of view any more valid than what he has 'heard' elsewhere? Where will it end?