On the inside of the intake manifold, right behind the throttle openings, there are two holes in the floor of the manifold. Brent Franker talks about plugging these with earplugs when he ported his IM to 58mm. Does anyone know where these passages lead? From looking at it, I suspect it's where the EGR gases are allowed into the intake plenum, but I'm not sure. Anyone know?

Rob
95Z28

 

Im guessing that one is the EGR and the other is for the IAC. Just a guess though.

 

Thanks for the reply. I'm pretty sure it's not the IAC....the IAC hole is on the same plane as the throttle openings.... between and below the throttle openings, and it's a seperate passage. The two I'm talking about are in the manifolds interior, behind the throttle openings.

 

OOOO, I get you now. I'll see what I can find for you.

 

I think it's EGR and MAP... Don't quote me on that though... Just tape over em and grind away Thats what i'm doing right now on an airfoil

EDIT< I think MAP is on top...

-Shannon

 

Hey, quit putzing around on the computer and get back to work
!

You're right, the MAP is at the top. I've got my compressor charged up now (couldn't run it earlier 'cuz the kids were sleeping) so I'll be able to very what goes where. Pretty sure it's the EGR.

Rob
95Z28