midwestjunk

iTrader: (2)

I am finishing up my 408 here shortly and about ready to drop it in the car. disregard my signature of 200 shot. I have a stand alone fuel cell up front and pump dedicated for nitrous fuel supply. Here's the motor specs:

408 cubic inch iron block
TEA ported 245 heads
custom cam
ported super victor intake
accufab 4150 TB
12.5:1 compression
110 race fuel

Guessing 600-700 flywheel horsepower

The car has the old stuff in it from the stock head/cam motor. racetronix/walburro 255 pump and 36lb injectors. I know this will not work. What size injectors are required for this new motor? I've heard 42's will get me by then I've heard I need 60's... as far as the pump I was recommended if I want to stay stock lines and stock gas tank I should do a Lonnies performance dual 255 pumps intank. Is there a single pump that will work for me?

midwestjunk

iTrader: (2)

134 people have viewed this thread and no one knows anything! this place isn't what it used to be for help lol.

I stopped in at Speed Inc when I was in the area and they recommended 60lb injectors and an Aeromotive 340 pump to be safe, which is not a direct replacement. I have heard of a few guys posting on here they pushed the 255 pump I have to over 600@ the wheels. I know it's not recommended, but anyone have any experience with this? It would be great to not even have to change my pump.

Ed Wright

iTrader: (1)

42 lb injectors are big enough. No advantage at all to too much injector. a 42lb injector at 60 psi is a 48lb injector. I'm making 600 with 36lb FAST injectors at 60psi, which makes them 42lb . If you know it is going to make about 600 fwhp, 42lbs running at LS fuel pressure (58 to 60 psi) are plenty.

Dmoney

iTrader: (22)

If it helps, I'm running Racetronix 42lb with their fuel pump using Speed Inc's fuel rail kit using stock lines and stock gas tank making over 600 flywheel at 11:8:1 on pump gas....