This listing is for a SET OF CLEVITE "A" series ROD, MAIN & CAM BEARINGS PLUS HASTING MOLY PISTON RING set compatible replacements FOR 1970-90 CHEVY 427 454 BIG BLOCK ENGINES. Fitment includes: 1966 - 1969 CHEVY BBC 427 CAR ENGINES & 1970 - 1990 CHEVY BBC 454 CAR AND LIGHT TRUCK ENGINES. We offer Rods & Mains in STD, .010" or .020" under sizes. Piston Rings are available in STD,.020", .030", .040" or .060" over size. IF OVER SIZES ARE NEEDED, PLEASE CALL or MESSAGE US WITH THE BORE SIZE AND BEARING SIZES YOU NEED TO VERIFY AVAILABILITY BEFORE ORDERING, OTHERWISE YOUR KIT WILL SHIP WITH ALL STANDARD SIZES.