shovelhead73

I have a 2006 LS2. I bought a FAST 90 mm intake and Fuel Fail along with a set of LS7 injectors. First, the FAST intake injector boots are not compatible with the LS7 injectors or the old LS2 injectors. They sell a conversion kit but from the description it's a conversion for the OEM fuel rail and not the manifold. The second problem I noticed was the LS7 injectors are a 1/2 shorter than the LS2 injectors. Do you have to modify the FAST fuel rail mounting blocks to make up for the shorter LS7 injectors? Any help would be appreciated. thanks

Gregory

iTrader: (4)

I have LS7 fuel rails in my FAST with 42lb SVO injectors. The LS7 fuel rail works with the FAST intake. Using SVO injectors give a normal height injector. So, there is no straightforward answer. However the LS7 fuel rails do not have a big inside diameter for large fuel capacity.

Big Bird WS6

iTrader: (9)

i heard that the stock ls1 fuel rails will support 1000 horse. is this true?

shovelhead73

I took the red/orange o-rings off the LS7 injectors and replaced them with the blue o-rings off the LS2 injectors I had. The LS7 injectors now press into the maifold sockets with no problems. I tried the LS2 injectors with the blue o-rings but the FAST fuel rail interferes with the tops of the mounting bolts and will not line up properly. The 1/2 shorter LS7 injectors and the FAST fuel rail has no interference issues but now I need to make a new set of brakets to secure the fuel rail.

Stock 3/8" fuel lines will not support the volume of fuel needed for 1000 hp. 1/2" or -8 AN will work, but your better off being safe and run 5/8" or -10 AN.