yep the last nail head i did i had sent the cam into ERSON for a regind and use adjustable push rods .after cutting the heads regrinding the cam valve job re face the lifters moves stuff abit nice to have them .crower . trend . smith . and others i think can help with the push rods . this really is not much diferent then building a big stoker engine alot of parts are custom but its fun to make things work