Mr Gasket Performance Exhaust Gasket for Square Port 1.85"W x 1.90"H
Suit Big Block Chevy 1965-99 with Cast Iron, Dart & World Products Heads

Mr Gasket was the first manufacturer to incorporate slotted mounting bolt holes at the ends of each exhaust gasket. This allows the gasket to be installed without removing the header flange or exhaust manifold entirely from cylinder head, making installation faster and easier.