Minimum fuel line size for 347 with EFI

Just a quick question here - interested in folk's opinion on minimum fuel line size for a mild-ish 347 running 8 stack/multi-port EFI. My current system is plumbed with AN-6 and it just looks a little small to me. Fuel pressure is in the 60psi range with twin pumps and a fuel pressure accumulator (not a swirl pot).

Don't want to starve my engine at WOT. AN-6 big enough??? Thanks in advance.
 

Ken Roberts

Supporter
I’d say you are well within the limits of a 6AN line size. The C6 Corvette Z06 Cars with 505 hp use this size at about 58 psi.
 
I was going to to say 3/8". I think that's -6AN. I have 1/2" fuel line on my Buick. But that engine is 462 cid.
 
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