I need some help picking a fuel pump for my car... I think i wana go with a mechanical pump... how many GPH whould i need for a 600HP+ Big block with a 900Cfm carb

 

Anyone out there

 

This is not area that I'm an expert in, but from recent threads and formulas in HP books. A pair of 255LPH pumps can support roughly 1000HP...
Racetronix would be the company, user, to ask...
Also check out fuel pump threads in the "ADVANCED TECH" section...they love to kick the math around debating such things..

 

Saw your post on the Advanced section, but the thread was locked.

The average motor takes .5 lb/hr to make 1 hp. Using approx 6 lb/hr for gasoline, you will need approx 50 GPH at roughly 7# max pressure for a carbureted motor.

A high pressure mechanical pump with a regulator is the best way to go. Holley & Edelbrock both make a suitable pump for this application.

I prefer the 6 valve race pumps, though possibly overkill for the street. You will need a regulator as they put out 14# pressure.

Hope this helps.