500, 472, 425, 368 Discussion, Factory smog equipment and block stamping question in Cadillac Engine Discussion; I'll be going through the process of certifying my Engine Swap for smog purposes in Denver.
My truck is a ...
Re: Factory smog equipment and block stamping question
As far as I can remember the only thing the 74 had was a air pump... I can remember way back in 85 I had a 74 deville that would not pass inspection because there was a 500ppm limit and I was putting out 1200ppm ... So I pulled it apart and found 2 burnt exhaust valves and broken rings on one cylinder.. After a valve job and new rings I not only passed 74 standards but passed brand new 85 standards that were 150ppm.. when he sniffed it it was 16ppm... And that was with the air pump taken off. I had gotten pulleys off a 76 that had no air pump..