Billet Metering Block

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Fully Tunable for Street/Strip applications. Retains original vacuum passage for distributor vacuum advance. Idle feed restriction, emulsion and power valve channel restriction tunable with screw-in brass restrictions. Calibration upgrade without sacrificing street vacuum provisions.
This will fit any standard Holley two or four barrel carburetor (except 3 circuit Dominator and alcohol calibration carburetors)

Billet Secondary Metering Block

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Use this metering block to convert from a metering plate to metering block. This kit enables you to convert your single or dual inlet carburetor from a secondary metering plate to a secondary metering block. Kit includes a longer transfer tube and longer fuel bowl screws. Features adjustable idle feed restriction.

Billet Metering Block Conversion Kit

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For all Holley Double Pumper carburetors. Allows you to upgrade to billet metering blocks with a more aggressive calibration essential with engine modifications. Have tunable idle feed restrictions. Will also facilitate a conversion to four corner idle (some additional modifications to carburetor required).
This kit will replace the original metering blocks with a more aggressive ''race oriented'' calibration. Adjustable idle feed restriction enables you to fine tune the idle, not possible with press in restriction carburetors.