Mahle OE GM 5.7L 350 V8 Flat Top STD w/ P Coated Aftermarket Version Piston Set (Set of 8)MAHLE Original pistons are OE quality and have the same great OE features such as compensated ring grooves to assure proper ring loading and oil control, as well as expansion controlled designs for small fitting clearances to reduce engine noise, wear, emissions, and improve oil control. This Part Fits: Year Make Model Submodel 1977 Buick Century Base 1977 1978 Buick Century Custom 1977 Buick Regal Base 1977 Buick Regal SR 1977 1978 Buick Skylark Base