[Grady Clay]

I did that with a fire survivor (insurance purchase) in ’73 with a ’73.5 911T. I think it is still driving around Denver 35 years later. I saw it about three years ago.

Interesting P+A didn’t warranty the fire and I bought it through the insurance salvage. This was probably the first CIS 911 in Colorado.

In cold weather it doesn’t work well because the fuel can puddle in the bottom of the plenum (CIS puts the fuel above the valves, not in the plenum). Even when hot, the #2 & #5 cylinders run very rich. On that car we used the MFI thermostat heat (still on the L heat exchanger) on the bottom of the plenum and it worked OK at the expense of performance.

While I’m not happy with our (lame by my standards today) engineering, the fact that the 911 has survived 35 years is pretty remarkable. It has had to pass Front Range emissions standard to continue to be registered.

Hopefully the current caretaker (owner) will post.

BTW, we used a period real air filter, not some crummy screen. That was the same as I used (X2) on the 587/3 engines.

This is only a solution with CIS cams. Anything like a 911T (carb & MFI) cam and more doesn’t work.

Anyone considering this should investigate the easy EFI solutions available.

Best,
Grady