Allstar Performance SB Chevy Fuel Pump Block Off Plate - Aluminum Parachute Components They increase the manifold plenum

They increase the manifold plenum area and provide the maximum thermo barrier between the manifold and carburetor

Cuffs are adjustable from 10" to 15"Â

and Stainless

1957-1957 Oldsmobile 88

Allstar Performance SB Chevy Fuel Pump Block Off Plate - Aluminum Parachute Components They increase the manifold plenumCNC machined billet aluminum plates cover the mechanical pump opening in the engine block and include a gasket and stainless steel fasteners. Specialty items for the Shop, Trailer and Track. The Allstar Performance brand offers thousands of hard to find, specialty items that cover many segments in the performance aftermarket. For over 30 years, customers worldwide have come to rely on the quality, affordable and practical items available from Allstar