Thanks Guys. I've ordered a air cleaner"thermo-switch"from NAPA.Cold weather/cold motor performance improved big time by running a manifold vacumn hose straight to the air cleaner dampner valve.(we don't want the motor to have a steady diet of hot air as the weather changes)The motor was a basket case,so all of GM's plumbing was gone before we even started the project.I had commented that we run the vacumn advance using intake and the motor seemed to perform much better then with metered vacumn.(butt dyno)I'm sure there's a way to determine intake vacumn from metered vacumn...I just don't know it!...walt...by the way,John,I have an oil bath air cleaner on my 1955 Cadillac,and previousy a 55 Ford and a Ford PU and have never had a problem with their filtering ability,the motors gave me a long life...
