Quote:
Originally Posted by aharper33
This past weekend I acquired my grandpas 1964 GMC pickup that has a 305 V6 in it. The last time the truck was licences was in 1979 so I would say it probably has not moved since then. I was kinda wanting to do a compression test on each cylinder just to see what they are reading. Does anyone know what the pressures should read? I have been looking around and have not found any exact values.
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If I recall, my 305A v6 (1960) was supposed to be around 120-125 psi .
http://6066gmcguy.com/EngineData.html
I guess the real key is that all of the cylinders should be within 10% of each other.