Reply To: QD-20 compression.

[Don]

Well, the updated pistons/rods/wrist pins and bearings were introduced as a running change in 1960.  So, if yours is actually a 1959, it has the older plain bushing set up, although it was a little more “beefy” in 1959 than previous years.

Your compression readings don’t seem that far off, perhaps try a different gage after running the engine some more.  You definitely want to check for sloppy wrist pins though, very easy to check out.