Steel tipped inlet needles are necessary when using exotic racing fuels or alcohol or when using benzine or acetone additives. A .097" seat size should be used for small four barrel carburettors; a .110" seat size should be used for Carburettors up to 735 CFM; larger seat sizes should be used with Carburettors 750 CFM and larger.

Product Reviews for HO6-500-2 - HOLLEY