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C10 - C90 Bill · 08-09-2008, 07:46 PM

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

08-09-2008, 07:46 PM	#39
C10 - C90 Bill Registered User Join Date: Nov 2001 Location: Moneta, VA USA Posts: 3,067	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