“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 carburetors; a .110" seat size should be used for
Carburetors up to 735 CFM; larger seat sizes should be used with
Carburetors 750
CFM and larger. The following steel inlet needle and seat assemblies are available from Holley.
Inlet Needle Steel Seat Size 0.110" in. Adjustable