The Green 71 is now a very happy truck. I bought an Edelbrock 600 on the way home from work yesterday.

I pulled the Holley and the weird water jacketed spacer off last night and found... a humongous vacuum leak between the spacer and manifold.

Re-installed the Holley, set the idle mixture and she runs and drives like a Chevy should.

I'll drive for a few weeks with the Holley, then install the Edelbrock just for the heck of it.

I still haven't figured out why that goofy heated spacer was ever installed. It's made by "Clifford." Any ideas?

Paul Domeier
Green71