[nad427]

Yep.

Take a Sharpie and mark the top of the valve stem, roll the motor over by hand, pull the rocker and make sure the scrub marks on the stem are really close to center. If not it's time for different length pushrods.

Best way to measure correctly is with a pushrod length checker.

 

[nad427]

Thanks guys.....I know how to do it and will do it....Is it crucial that its done, before I ever fire it up.....Or do I just need to make sure its done, before I start putting some miles on the engine.....Its on the stand now just about ready to go.

Before is best.