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They are manufactured from cast aluminum and are offered with breather holes or without any holes
The Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise
Speedmaster aluminum crankshaft pulleys are manufactured from 356 aluminum that is heat-treated to T-6 specs
Speedmaster valve guides are constructed from high-quality bronze for durability and wear
Ford SB 289 302 351 Windsor Polished Ribbed Aluminum Valve Covers - Tall w/Hole They are manufactured from castDo 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 ribbed aluminum valve covers feature a classic raised, ribbed 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 ribbed aluminum valve covers
