Steel-tipped inlet needles are necessary when using exotic racing fuels or alcohol or when using benzene or acetone additives. A .097 inch seat size should be used for small four barrel carburetors, a .110 inch 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.
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