09-27-2025, 07:29 PM

dataway

Ultimate Warrior

Join Date: Jan 2012

Location: Greenfield TN

Posts: 9,275

OG,
So they did away with the heat riser valve in early 68?
There was nothing to encourage exhaust flow through the intake?

I had no idea. The set of manifolds I have on my (April 68) GTO have (had) the riser, but they are not original to the car.
I removed it and plugged the holes.

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