Finally got around to taking the engine out and pulling the heads. I don't have a vernier handy but am curious to see what bore it is on. There is nothing marked on the piston head save an "R" and an arrow. I expected to see a "STD", ".25" etc marked on the piston crown. If there is nothing marked can I assume it's on a standard bore? Thanks
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mckeon.m@comcast.net