Chevy BBC 454 1.880" +100 11/32" Stainless Steel Exhaust Valves They are an economical solution

They are an economical solution to replacing failure-prone stock supports

Stop searching junkyards and swap meets for a replacement for your cracked or broken timing cover

improving belt retention and reducing the risk of slippage

Look not further

The main difference is that there is an open area under the plenum chamber

Chevy BBC 454 1.880" +100 11/32" Stainless Steel Exhaust Valves They are an economical solutionWhen 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.