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This is our top-of-the-line medium profile LowRise+ Series manifold
They are manufactured from top-quality cast iron
Valve stem seals control the lubrication of the valve stem as it slides in the valve guide
They are individually hand turned and pressure tested to exceed performance standards
strength and horsepower capabilities are significantly outstanding compared to cast forged crankshafts
Chevy BBC 454 Black Finned Aluminum Valve Covers - Tall w/ Hole This is our top-of-the-line mediumDo 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 powedercoated black 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
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