-> We both knew about fuel fitlers at the time. What I did not
-> know years later was that Oldsmobile had another filter inside
-> the carburetor just after the gasline connection. That one
-> threw me until a racing enthusiast friend asked me if I had
-> ever changed it. :-) 

-> WC> Saved a lot of other more labor intensive maintanance. 

-> Yes, dirt and/or metal filings in the carburetor would be a
-> 'bad thing'. :-) 

Yeah, I'd find all that in my fuel valve trap and float bowls.
Adding the inline filter helped a lot and thereafter I  
I'd just removed the fuel valve's bottom to let the water out,
change the inline filter and occassionally run some ethanol 
in with a tank of gas.
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