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International Automotive Technicians Network
Re: Old-school running compression test help needed
Posted to Technical Discussion Forum on 3/11/2021

Steve,

I never used a running compression test much over the years. When I had the valve out, it was considerably lower than with it in, but I didn't pay attention to exact numbers. I searched on IATN for valve vs no valve and there was no overwhelming conse... Login to read more.