Thanks have heard guys go as tight as .005 with aluminum Block and Indy heads guess I'll try .005/.010 or .008/.013 Cam card says .018/.022 hot lash.

Guess at least once warm up and pull valve cover and check 2 aluminum starts to shrink real quick

Thanks again.

check heads cold to hot twice with these heads and stock iron block , had cover ready to come off shut off pull cover did right away and intake opened .010 and exhaust .008 .