[ta man]

Originally Posted by Cliff R

Regardless of the pump rating the problem with trying to use a mechanical pump to feed a big CID powerful engine in a pretty fast car is delivery to the pump.

I can tell you from actually doing it that 40gph or 120gph isn't going to much matter trying to feed it with 14' or so of 5/16" fuel line (the inside diameter of 3/8" line BEFORE you bend it). It is ALWAYS better to push the fuel vs pull on it. This certainly makes modern in-tank pump systems the way to go if and when the goals for your vehicle include a powerful engine and steps for the car to make HARD runs with good traction.......FWIW.....

x2 if I was at the starting stage with my build I would go in tank pump 8an or half inch lines and all connections and don't look back. I've seen so many big cubic inch builds at the track fall short on mph and et because of the fuel system...running lean is not good. Build it once and forget about it.