switching from mechanical to electric because my new block wont accept a mechanical. its 350 vortec sbc with lt4 hotcam, performer rpm intake, compression is like 9.8:1, and using a 650 demon carb. should be between 375 to 400 hp at about 5200 rpm. i was looking at the holley pumps and cant decide between the blue or the red. any input would be appreciated.

neither,,a good cheep pump that will last woud be a mallory,,went through tons of holly pumps in the past and the mallory out lasts them by 100 to 1..

87 Magnum, I have 4 of these for sale Aeromotive pumps like now 20 hours time on them $120.00 each plus ride. Bob

I use Mallory 140's (600HP) they are serviceable and inexpensive to rebuild. You could just run a 110 that is internally regulated to 6-7lbs

ok so what kind of flow and pressure do you guys think i need?

Anyone correct me if I'm wrong.

400HP x .55 (BSFC)=220lbs/HR
Gas weighs ~6.2lbs/gal
220 / 6.2 = 35.5 gals/Hr
35.5GPH x 30% (safety factor) = 46.15 GPH
6-7PSI
Also fuel pumps are rated at free flow state. Flow and pressure are indirectly proportional. A 110GPH pump puts out about 90GPH @ 6PSI

cool, thanks for all the input

I would go with one of those aeromotive ones and a nice good pressure valve !

Great pumps, no issues and reliable!