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Re: What kind of gas mileage do you get with your 67-72?
Before the rebuild, I believe it was in the neighborhood of 11 MPG for my stock 402/400TH. The engine was rebuilt in 1993, punched out and high performance heads off a 60s Corvette/Camaro. I've never checked and haven't cared to, but 8-9 is probably right.
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Tony
71 Custom Deluxe, SWB, 2WD, 402, A/C.
I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025
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