NHRATA01

iTrader: (10)

I can't seem to find a good answer. Or even more basic, is the LS3 and LS7 fuel rail the same - seems to be close but I have read in some posts the injector angle is not quite the same.

Basically I'm sizing up fuel/intake for 454 Darton motor topped with LS7 heads, and going with the MSD LS7 intake in an Fbody. I know the MSD is built to accept stock LS7 rails. But it seems a bit confusing to try to find OEM LS7 rails for sale from most vendors. However LS3 rails are pretty common. So can they be substituted, or do I go to GMPartsdirect and just look for LS7 rails?

Thanks!

NHRATA01

iTrader: (10)

Ah crap I apologize, meant this to go in Gen IV External Engine.

G Atsma

No biggie, someone will answer this, whether it moves or not.

Che70velle

iTrader: (6)

I’m running a Mamofied LS7 MSD Atomic, and you do have to use LS7 fuel rails on this intake. The LS3 rail won’t work on the LS7 MSD.

NHRATA01

iTrader: (10)

Awesome, thanks for the feedback Che70velle. Off to GM parts I go.

G Atsma

See? Told ya! lol

NHRATA01

iTrader: (10)

16 years a member and still getting all my questions answered, lol

G Atsma

And all is right in our world.... lol