When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
They are probably the high pressure cast type of piston common to Japanese motors. Extremely strong with very good control on bore fitment. Only thing they really don't like is spark knock, it has a tendancy to breakdown the ring lands area.