390 double pumper vacuum

RustyRatRod said

Stamped "somewhere" on the metering blocks and main bodies. Usually on the top edge of the metering blocks and on the side of the main bodies.

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the two i have, one is stamped on the main body on the throttle arm side (the other side is similarly cast and just stamped "holley"), the other is stamped on the bottom of the main body. these are both older, so mileage may vary.