line diameter for V8 cars

[moparmat2000]

What was the standard sixd diameter of the fuel chassis line on the hi po small block cars?

Thanks in advance
Matt

 

[RustyRatRod]

5/16

 

[BillGrissom]

Agree. Even 90's Magnum engines had a 5/16" tube. I think only a few cars have a 3/8" tube. Later Corvettes do. If installing EFI fueling, most people run a new 3/8" tube and use the factory 5/16" tube for return.

 

[dennday67]

I heard even the big block cars ran 5/16" when I had mine out I decided to upgrade to 3/8" because I heard it helps keep the fuel cooler plus I went with a 3/8" sending unit with the return line nipple so if I go with fuel injection its there if I need it.