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The Holley 4150 has a metering block in the secondaries that takes jets that can be changed. The 4160 has a metering plate with a fixed oriface instead of jets that cannot be changed. The 4160 is the economy version but can be converted to the 4150 with a kit from Holley that replaces the plate with a metering block, thereby gaining the replaceable jets in the secondaries.

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