Allstar Performance Holley 4500 4-Hole Carb Spacer - 1/2" Thick Data Acquisition 10 AN Female O-Ring Inlet

10 AN Female O-Ring Inlet / Outlet

Harness Slide Adjuster

550 Long Silver

ACME threads for high strength

Allstar Performance Holley 4500 4-Hole Carb Spacer - 1/2" Thick Data Acquisition 10 AN Female O-Ring InletSpecially 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",