Steel Pre-Flattened O-Ring Head GasketSuit Pontiac 326-455, 4.300"Bore, .039" Compressed ThicknessBrand: FELPROPart Number: FE1016Description: 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.