326-455 Pontiac Exhaust PORT SIZE 1.53in. x 2in. Exhaust Header / Manifold Gasket - 1.530 x 2.000 in D Port - Steel Core Laminate - Open Center Port - Steel Core Laminate - Pontiac V8 - Pair

Exhaust Manifold Gasket Set Pontiac V8 400/455 Exhaust Header / Manifold Gasket - 1.845 in Round Port - Multi-Layer Steel - Pontiac V8 - Pair

Exhaust Gasket - Pontiac 400-455 Ram-Air IV/SD/HO Exhaust Header / Manifold Gasket - 1.875 in Round Port - Graphite - Pontiac V8 - Pair

Exhaust Gasket - Buick V8 400-455 Exhaust Header / Manifold Gasket - 1.313 x 1.938 in Rectangular Port - Graphite - Buick V8 - Pair

326-455 Pontiac Exhaust W/ SPLIT CENTER Exhaust Header / Manifold Gasket - 1.460 x 1.920 in D Port - Steel Core Laminate - Pontiac V8 - Pair