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!

 

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

 

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

 

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.

 

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

 

See? Told ya! lol

 

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

 

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