Allstar Performance Exhaust Block Off Plates - SB Chevy - Standard Port HALCP26L The upper mount has been

The upper mount has been engineered to reduce flex by 52% over the competition

Tapered four-hole spacers have specially contoured holes to increase air velocity under the carburetor

ALL38128 and ALL38145 plates come with bushings to allow for engine flex and help with weight transfer

Replace factory original plugs or use in place of factory crossover steam tubes

Carburetor Inlet Banjo

Allstar Performance Exhaust Block Off Plates - SB Chevy - Standard Port HALCP26L The upper mount has beenAluminum block off plates seal exhaust ports during engine storage or repairs. Plates help protect against moisture, dust, and dirt. 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