no metering plate

yellow rose said

So -3 4160 carbs had secondary metering blocks? I didn't know. Haven't used or bothered with any VS carb since the early '80's.

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No. They have either the thin sheet metal plate or the thick one, but no block. Only 4160 I've seen were the factory 3310 780 carburetors used by GM. They had the full metering block in the rear.