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Birchwood is a great thermal barrier
1998-2002 Mazda 626
Durable polypropylene nets are ideal for a variety of full bodied cars
1975-1991 Chevrolet Corvette
Allstar Performance 1" Phenolic Carb Spacer - Contoured Hole 1425023 Birchwood is a great thermalSpecially designed for drag race applications to isolate carburetor from manifold, spacers prevent horsepower robbing heat transfer and increase the distance from the bottom of the carburetor to the manifold plenum for better air flow. Spacers are CNC machined in the U. S. from a polymer compound able to withstand temperatures up to 400F. Available in open or four hole versions for 4150 and 4500 series Holley and Holley style carburetors in 1 2", 1",
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