Allstar Performance 1" Phenolic Carb Spacer - Contoured Hole

Phenolic spacers prevent horsepower-robbing heat transfer while also increasing air flow. Spacers are precision CNC-machined in the U. S. from a state-of-the-art polymer compound and can withstand temperatures up to 400? F. Available in open or four hole versions for popular 4150 & 4500 Holley style carburetors in 1/2", 1" and 2" thickness. Four hole spacers are additionally offered with specially tapered holes which increase air velocity under the carburetor.