(bobw your motor came out beautiful!) Shoestring – If everything checks out with the battered wrist pin bore syndrome, I wouldn’t worry too much about those compression numbers. I’ve had many 10s from the 50s that showed those numbers and ran great, started easy, idled down nice, and had good top speed. And as mentioned they may come up a bit too.
It’s also been mentioned before that numbers can vary between different compression gauges. I had Pugsley’s Marine, a local respected outboard repair shop, compression test 3 of my motors (a 10, an 18 and a 25) and all 3 showed exactly 13 lbs. higher than my gauge.
Here’s a ’58 powerhead that showed only 67 top and 70 bottom on my gauge but after doing carb, ignition, synchro, etc. it’s an excellent runner.
https://www.flickr.com/photos/55515333@ … res/JL77P9
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