Re: 65 C60
Also want to mention one of the most important things about a 292. They like to breathe. If you change the stock muffler to a straight thru muffler you will gain performance and fuel mileage.
I used to run the GMC V-6 straight thru muffler years ago, but they don't make them anymore. A glass pack is a good alternative. The extra bonus is that it will also sound better.
Also check and/or change your PCV valve.
Bill
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