[brucepick]

The a/c fan is pretty close to the cat's cover shell. I think that anything put over that would block the air flow out of the fan. If I was willing + able I suppose I could put a pusher fan in front of the a/c condenser instead of the rear puller but I'm not ready to undertake that job.

It's been running very nicely though. Lean burn just about any time I want.

I did put a full block over all grill openings on the cat side of the car, and in the center portion of the grill also. The only part that's open is what's to the right of the license plate in the lower grill. Upper grill is fully blocked with a smooth panel.

Recently I adjusted the valves and the ignition timing. Timing had been set for maximum advance - not good. Adjusting it by timing light still left plenty of ping so I did trial and error to get it to clean up. I think I finally got it right today. Today's fillup was nearly 46 mpg and it looks like the next tank might be better than that.