Vavle lash

I have built a lot of BBM with the aluminum heads. What ever the cam card says, set them .010" tight cold for the first run. After cam break-in, reset them while hot to what the cam card says. Then let it cool down over-nite and and check them with your feeler gauge. This is your cold lash setting and will be pretty close to being spot on when warm.

The cam has to take a set, so does the liter, pushrod and rocker. All these things will increase lash, so set them .010" tight for the first run.