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Old 08-26-2010, 08:57 AM
cobalt327's Avatar
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1976-86 pickups, vans and medium duty trucks are a great source for 170-prefix 800 CFM carbs. All engines could have (and most DID have) the 800 CFM, even the 4.3L V6.

FWIW, the original carb on my '86 Sierra 4.3L V6 is a 800 CFM, w/forward-pointing fuel inlet.

As seen looking down into an assembled carb:
750 CFM-

800 CFM-


Below- as seen disassembled, the top image is of a 800 CFM venturi, 750 FCM below it. Arrow (above) and circle (below) indicate the 'bulge' seen only on the 800 CFM versions:

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