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I agree but the problem on a comp test the engine needs to be at temperature, something out of the question right now. It can be done just not going to get near as accurate result. Need to get the metal hot so it can expand for better compression readings.
And in addition if there is a bad head gasket you can get 0 compression readings and mistake it for a bent valve. I found this out on my rebuild, I thought I tweaked some valves and once the head was removed all valves were fine, the HG on the other hand looked like swiss cheese.
Dal
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PCA " I've been everywhere, done everything......just can't remember any of it!" 
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