[67drake]

One of my winter projects is to finish the rebuild on my ‘62 Mercury engine. So having just finished cleaning the pistons up, I figured I’d break out the micrometer and feeler gauges to inspect them.
I installed a new top compression ring and checked clearance between the ring and groove, it’s supposed to be no more than.006”. I’m getting around.010”. Crap. I grab another piston and check all the way around, same thing. Man, this engine has been in impressively good shape till now. I’m checking the Summit website for replacements ($450), and noticed I had grabbed my son’s metric gauges! I grabbed my old Craftsman set and now showing.004”. Whew
I can only imagine how pissed I’d be if I ordered new pistons and they showed up and measured the same.