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Old March 7th, 2023, 04:05 PM
Prowbar Prowbar is offline
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
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Default Re: Checked mileage on my 66 1500

350 V8 you say? Or 351 V6? We like the V6's, not so much the Chevy V8.
Anyway, with the 305 V6 most get between 11-13 MPG. Figured the 351 is about the same.

Have you checked the mechanical and vacuum advance on your distributor? Both should move freely, and the vacuum advance canister should hold a vacuum.
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