Oldsmobile 307 330 350 - 455 Remflex Exhaust Manifold Gaskets 64 - 90 REM11-001Oldsmobile 307 330 350 455 Remflex Exhaust Manifold Gaskets 64 90 REM11 001 Exhaust Header and Manifold Gaskets, Rectangular Port, Graphite, Designed for Use with Square End Ports, Oldsmobile, Olds V8, Olds Diesel V8, Set Port Style: Rectangular Gasket Material: Graphite Port Height (in): 1. 938 in. Port Width (in): 1. 438 in. Thickness (in): 0. 125 in. Quantity: Sold as a set. Notes: Designed for use with square end ports. Separated center ports