Measure your pushrods don’t guess. My engine has 4 different sizes to get the preload correct.

 

Just wrapped up helping a friend with his complete Mamo setup…MMS 265 heads, ported MSD, custom cam, NW 102, etc, in his crazy low mile C6Z. He used limited travel hydraulic lifters and I measured the pushrods for him. Had 15 different lengths out of 16 pushrods. Of course they are all with a few thou, but nonetheless it proves that measuring the pushrods carefully and correctly is of utmost importance. Valvetrain is super quiet and the car is crazy quick.