I have torn down a B18. The pistons measure pretty consistent 0.006-.0078" piston to wall clearance at the skirt. The green book says to re-bore at 0.010". By that measure, i would just re-ring and hone.
The bores are very consistent 3.34765-3.3470, (it was bored to 0.030" over by a previous owner. So new 30 over pistons would likely still show around 0.005" clearance which is higher than green book "new" specs of 0.0016" max.
Any experience out there that is relevant is much appreciated. I'd like to avoid new pistons if possible.
dean
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