Red01Chevy

im building a 408 it wil be radical not a street car engine will a walbro 255 with 37ld injectors and stock line support me it will be NA

WKMCD

iTrader: (2)

I run a Wallbro 255 as part of the Racetronics kit on my 403 @500+RWHP w/ 42lb FORD SVO injectors. Works fine but mine is a mild build street only car.

Red01Chevy

well this will be a solid roller all out drag car i want to run 9.90's at 3200lbs on pump gas

The Finest

I would say yes, but you might be close to max duty on the 37#ers.
You didn't mention which rails you are running.
I am running that pump with 60#ers and a Bell BAP, but forced induction. I'd say go with larger injectors if you are buying new; always have room to grow.

Red01Chevy

i already have the injectors and it will be NA
and stock fuel rails iff possible
do aftermarket rails make that much difference