1966 Coupe 454/538hp 4spd of course; 1984 Z51, built 11/83, Blue w/Black Leather factory override..
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A vacuum canister captures extra engine vacuum (approximately double the volume of vacuum available), recommended for cars with 14 inches of vacuum or less (Comp Cams). Hydroboost is more costly, and weighty IF you intend to race. JMO.
C'ya
C'ya