Originally Posted by doorracer
You will pick up about .005-.006 after the motor heats up. If you need .021 hot set them at .015-.016 and .017-.018 cold.
That is with iron block and aluminum heads.
Curtis
X2
I have a Big Chevy with iron block/aluminum heads and mine opens up about .006 when it heats up. What I do is set them about .006 tight to get the thing started, then get it up to operating temp and check them and see how much they opened up.That way you know how much and then you can do the math and just set them cold every time. JUST MY OPINION