Pontiac 326 400 455 1.660" 11/32" Stainless Steel Exhaust Valves This is our top-of-the-line medium

This is our top-of-the-line medium profile LowRise+ Series manifold

it has a square bore carb flange instead of a spread bore

Perfect for replacing missing or damaged mounting caps

They also help to insulate the carburetor from engine heat and provide clearance for linkages

Pontiac 326 400 455 1.660" 11/32" Stainless Steel Exhaust Valves This is our top-of-the-line mediumWhen it's time for valves, don't cut corners. Get genuine Speedmaster stainless steel valves. They're made from a tough, stainless steel alloy and are carefully designed to increase gas flow for more power. What's more, they have hardened stem tips for durability and are swirl polished.