Re the crank the journal measures up nice and 'round' no hint of being oval. I shall prob get the -20 timing bush to give him plenty of metal to bore out
Re the pistons. Those have been in these STD bores for the last 15 years with one ring change 5 years ago due to the lack of wear. The scratches have only occurred in the last 5 years. I suspect it could be down to lack of air filter
. No dry assembly always plenty of oil used, proper running in but after that plenty of revs and snappy get aways at the traffic light Grand Prix
. I put the lack of wear on the crank etc down to the fact I changed the oil pump(after the original pump failed) to a cast iron bodied SRM pump. She has done circa 50,000 in the last 15 years so not so bad(have to admit this is the second crank after I cracked the big end journal when the timing slipped and the oil boiled ooopps)