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Although the GM heads are good pieces
They come in tall and short models
a micro-switch for back-up lights and a neutral safety switch preventing accidental starts when in gear
Deluxe Interior
These retainers are available in a variety of lock angles and sizes to suit your needs
Chevy BBC 454 1.880" +100 11/32" Stainless Steel Exhaust Valves Although the GM heads areWhen 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.
