Allstar Performance Holley 4500 4-Hole Carb Spacer - 1/2" Thick H75915FS GM X-Body 1971-72

GM X-Body 1971-72

1-1/8 in x 26 Spline

Carb mounting flange is uncut

Extended service life in methanol and ethanol

500 pounds of load-leveling capacity

Allstar Performance Holley 4500 4-Hole Carb Spacer - 1/2" Thick H75915FS GM X-Body 1971-72Specially 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",