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OK, thanks, good to know. This powerhead was part of a lot clear out sitting on a pallet; so it is not mounted on an exhaust housing and exposed to dry air for the better half of a decade. The numbers were all 105-120, with bottom two cylinders a little bit less (say 95-105), so I’,m thinking some stuck/dry rings. There was a bit of mouse nesting near the exhaust orifice too so the fabric/cardboard nesting materials probably did a good job of wicking away any oil/moisture that was in the cylinders.
I pulled both heads and don’t see any red flags in terms of scoring on the bottom two cylinders. The powerhead is bone dry.
Hope the freezingham meet was a great one yesterday!