S4 TII & S5 TII fuel rails interchangable?

MaczPayne · 09-12-2008, 04:05 PM

I've spotted a leak coming from the front side of my upper fuel rail.

Looking for replacements, does it matter if I get an S4 TII or S5 TII upper rail?

I realize the FPR's on both rails are different, but using factory High-imp injectors, would it be possible to use an S4 TII uppers with S5 TII lowers?

classicauto · 09-13-2008, 10:58 AM

FWIW I have S4 TII rails on my S5 TII manifolds....so dimensionally they are exactly the same. EDIT: Actually not quite, I have a couple washers under where the rails bolt on to space them up, otherwise its exactly the same

RETed · 09-13-2008, 09:25 PM

Primary rails are all the same...dimensionally.
The secondary fuel rails are different.
You can use one with spacers / washers but not vice versa.

-Ted

09-12-2008, 04:05 PM	#1
MaczPayne Bah! Join Date: Mar 2008 Location: Riverside, SoCal Posts: 442 Rep Power: 18	S4 TII & S5 TII fuel rails interchangable? I've spotted a leak coming from the front side of my upper fuel rail. Looking for replacements, does it matter if I get an S4 TII or S5 TII upper rail? I realize the FPR's on both rails are different, but using factory High-imp injectors, would it be possible to use an S4 TII uppers with S5 TII lowers? __________________ Johnson TA FC in the works!

09-13-2008, 10:58 AM	#2
classicauto crash auto?fix auto Join Date: Feb 2008 Posts: 816 Rep Power: 18	FWIW I have S4 TII rails on my S5 TII manifolds....so dimensionally they are exactly the same. EDIT: Actually not quite, I have a couple washers under where the rails bolt on to space them up, otherwise its exactly the same