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It is effective at any rpm level or load
They are manufactured from machined steel and offer excellent valve spring location
not just a limited frequency range
capable of withstanding valve spring load
Pontiac 326 400 455 Polished Nostalgic Finned Aluminum Valve Covers w/Hole It is effective at anyDo you want to finish off your engine in style? Try a set of these Speedmaster finned aluminum valve covers. They are manufactured from cast aluminum and have a polished finish. Speedmaster finned aluminum valve covers feature a classic raised, finned design that adds a unique look to your engine. If you don't want any breather holes drilled, no problem they are offered with breather holes or without any holes. Speedmaster finned aluminum valve covers
