This turned into a bit of a - well, while I'm in there

Top points if you can guess what it's from
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I actually had an oops changing a $2 oring on the distributor. It has an offset drive so it can only go in one way........ Except it can go in the wrong way and then flexes the rear of the head and camshaft in an impressive way. Juuusssst bent the last exhaust valve enough that it would stick when warmed up. Oh well, got everything on clearance so that's cool, timing belt is due and got that for $12