C-3, fuel lines

[D S.]

Did the 1970 LT-1s have two fuel lines, one supply from the tank and one return, or only one line? Big block? Is the fuel line size difference between the small block 5/16" versus big block 3/8"?

Thanks,
Scott

[Joe L.]

Re: C-3, fuel lines

Scott----

No LT-1 ever used a fuel return line. In fact, with ONE exception, no Holley carburetor-equipped Corvette ever used a fuel return line (I'm talking about PASSENGER SIDE fuel return lines here and NOT DRIVER SIDE vapor return lines from the charcoal cannister). What was the ONE exception? It was 1971 with LS-6.

1970-72 Corvettes with LS-5 used a fuel return line.

All C3 Corvettes, small block, big block, and, likely, medium blocks if they had built any used a 3/8" fuel line. Base engine cars used a 3/8" fuel line; ZL-1 used a 3/8" fuel line.