Steel Pre-Flattened O-Ring Head Gasket Suit BB Chevy Mark IV Block,Extra Thick Steel Core Laminate, 4.540" Bore, .051" Compressed Thickness, Two Coolant Holes Per End

• Extra thick to reduce compression and correct valve to piston clearance
• Fits Mark IV Block
• Does not Fit Gen V Block
• Does not Fit Gen VI Block
• Two coolant holes per end.
• Three lower coolant holes

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.