i am doing a 429 to a512 with custom ground roller cam the kit is srp pistons scat cast steel crank and scat Hbeam not to bad for price all the engine i do long or short block the i do a ultra-finish plateau hone the bores and with moly rings they seat fast but if a flat lifter cam as to be broke in right with oil with zddp or a can of zinc comp gm and others sell to help the cam