Plenum questions - ZR-1 Net Registry Forums

VetteMed · 01-04-2010

I picked up a spare plenum many months ago, and haven't really looked at until today. It is identical to the plenum in my '91, with the exception of 2 holes - one on each underside of the runner pairs, for the 2 passenger side rearmost cylinders. It is smooth, about 3/8" diameter. Any idea what this might have been for? Also, how far up do the "walls" between the runners normally go, from the mating surface for the injector housings?

01-04-2010	#1
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,816	Plenum questions I picked up a spare plenum many months ago, and haven't really looked at until today. It is identical to the plenum in my '91, with the exception of 2 holes - one on each underside of the runner pairs, for the 2 passenger side rearmost cylinders. It is smooth, about 3/8" diameter. Any idea what this might have been for? Also, how far up do the "walls" between the runners normally go, from the mating surface for the injector housings?