So im building a gen III 4.8 S480 Fbody Firebird. As most people on here im ballin on a budget and curious on your input on the fuel system.

Fuel system so far is a 5 gal sump cell (E85)
(2) -10 AN lines from tank to (2) 100m filters
dual AEM 380 lph pumps
Y block to 10m filter
-10 AN feed line to the rails
Fuel regulator -8 AN return
-8 AN line to rails with the AN fitting adapter
Bosch 210lbs injectors running 50psi base pressure

Using the 3rd gen truck intake and rails, im shooting for 850+whp. What do i have to do to achieve this? Im aware that by simply spending $120-200 to get aftermarket rails would solve this issue but i would like to explore the "possibilities" of stock rails IF the budget doesnt allow aftermarket.
I know people have ran these numbers and looking to see what the "larger" picture is. Im aware that since i run such a large injector that i can get away with less rail pressures and hoping that with that plan i wont see as much pressure drop over the rails at high boost. i may be completely wrong but that is why im looking to hear your input

regards
Ox

 

Unrelated but how do you plan on running a truck intake in an fbody. It doesn't fit unless you cut out the cowl and run a cowl hood.

 

Cowl gone
cut hole in hood

 

The + after 850 is a biggie... You are fine on a factory rail around 850-900whp on E85. Higher the base pressure the better pushing small diameter stock stuff.

I also like to add an additional -4 rail supply off the FPR at the fuel pressure port to give the oem rails a little more wiggle room. Super cheap and easy to do anyway.

https://ls1tech.com/forums/forced-in...ls1-rails.html


This is a deadheaded ls1 rail with 1/2 supply from tank to regulator. Trapping 160 @ 3200lbs on E85.

 

I would spring the 150 for rails. I did on mine and they are actually really nice for the money

 

What rails are those?? ^^^^^

 

Standard China special.

 

we are at 1004 whp on a 4.8 with stock truck fuel rails. On E85.

 

Yep, on ebay.

 

i went with holley efi -8 rails. Now to build the rest of the system