quote:Originally posted by George P:
No 351C manufactured from August 1969 through mid 1974 was ever equipped by Ford with a "smog pump" (Ford's actual name for the pump was a thermactor air pump). Not in Mustangs, Cougars, Torinos, Montegos or Rancheros. It was not "omitted" from the Pantera. The Cleveland's siblings, the 351M and 400, got pumps in 1975 when catalytic converters were installed in the exhaust system. The exhaust ports in the 2V Cleveland cylinder heads were modified to allow air injection at the exhaust ports beginning that year.
Back to the topic of replacement carburetors.
The limit was 800 ppm. The engine without a pump would do as I recall around 880. I had a pair of iron manifolds with a brass port at the front of each that would hook to I think a 3/4" id hose, and I'd add a generic Ford air pump to the a/c pulley. It would bring it down to 775 or so, just enough to get it through.
It only had to run on the machine that way.
The carb had to get switched out to for a Holley 1848 which was easy to do.
The vacuum advance needed to get plugged and the advance set down to 5 or 6 degrees.
Wonderful days.
NY emissions were VERY tough then. That engine was not clean enough stock to get it through. Late '70s up to around 85.
My 302 was tough to clean up too. It needed air plus the cats.