Steel Pre-Flattened O-Ring Head GasketSuit Buick V6 231 (3.8L) Stage 1 & 2, 1975-87, 4.090" Bore, .039" Compressed ThicknessBrand: FELPROPart Number: FE1026Description: Fel-Pro wire ring head gaskets, with a stainless steel combustion armour, proprietary-coated composite facing material and a solid steel core deliver and unbeatable combination of quality, capability and value making them the single best choice for the vast majority of racing and street performance engines.