I'm looking at mechanical fuel pumps for the street-driven 347 I'm building, and I'm a bit confused at the options available. I keep reading that something like 3/8" lines would be a good idea for a motor in the 350-450 HP range.
So anyway, this might be really dumb, and it's possible I've confused something entirely, but here's the deal: I was on Summit comparing the selection of stock SBF fuel pumps to the aftermarket options, and noticing that it seemed as though the stock pumps had mostly 1/4" NPT fittings on them. That seems like it would restrict the standard 5/16" line even more, but for a stock application I guess it's suitable. Anyway, then I noticed that Carter's "high performance" pumps are also using 1/4" NPT fittings. That piqued my interest, and I started looking at the pumps they used on bigger motors, and noticed that even 428's and such are also using 1/4" NPT fittings from the factory.
I'll probably just end up getting something like an Edelbrock pump and 3/8" lines and call it a day, but I'm just curious, because after looking at everything available it doesn't seem like there's much difference, on paper, between these performance pumps and the standard ones from the factory. Even their free flow rates are all roughly equivalent. Is 3/8" overkill?
So anyway, this might be really dumb, and it's possible I've confused something entirely, but here's the deal: I was on Summit comparing the selection of stock SBF fuel pumps to the aftermarket options, and noticing that it seemed as though the stock pumps had mostly 1/4" NPT fittings on them. That seems like it would restrict the standard 5/16" line even more, but for a stock application I guess it's suitable. Anyway, then I noticed that Carter's "high performance" pumps are also using 1/4" NPT fittings. That piqued my interest, and I started looking at the pumps they used on bigger motors, and noticed that even 428's and such are also using 1/4" NPT fittings from the factory.
I'll probably just end up getting something like an Edelbrock pump and 3/8" lines and call it a day, but I'm just curious, because after looking at everything available it doesn't seem like there's much difference, on paper, between these performance pumps and the standard ones from the factory. Even their free flow rates are all roughly equivalent. Is 3/8" overkill?