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Old 04-30-2015, 11:56 AM   #14
aruss99
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Join Date: Feb 2015
Location: Phoenix Arizona
Posts: 122
Re: 1971 C-10 knocking sound and not reving past 3000 RPM

Quote:
Originally Posted by Ol Blue K20 View Post
It could be an exhaust valve causing the "popping" noise. Is the popping coming up the carb. What do you mean when you say compression test comes up 8.5 through 9.5 to 1. All gauges I own are in PSI not compression ratio.
My apologies. I was getting between 8.5 to 9.1 Kg/Cm^2. I think that is around 125 PSI. I assumed that was the compression ratio, but maybe that was an incorrect assumption. And yes, it sounds like the popping sound is coming up the carb.
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