Re: 1968 GMC 250 Fuel Line
L6s took a 5/16ths fuel line. V8s ran with 3/8 from the Factory. Some people upsize, but I run a bored-out 292 with a 500 CFM Edelbrock 1404 and I get fine fuel flow with the stock size.
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Every 25 years I like to rebuild that 292, whether it needs it or not.
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