Holley Secondary Metering Block - Chromate - Holley 4160 Carburetors 34-6 SR71050H there is a mechanical advance

there is a mechanical advance assembly that is mounted on top of the distributor shaft making it easy to adjust the advance to meet your needs

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Holley Secondary Metering Block - Chromate - Holley 4160 Carburetors 34-6 SR71050H there is a mechanical advanceHolley Metering Block 34 6 Standard Finish (0 1850C S) Or Most Any Model 4160 w Side Hung Float Bowl Metering Block Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as