KB 162, and it is rated 5cc relief. Basically a stock piston replacement. 8.6 comp with a 90 cc head, 10.2 with a 72cc head.  Put a set of them in the '70 383 HP engine I rebuilt 10+ years ago. Only set that gave any reasonable amount of compression. Still ended up decking the 906 heads down a good bit.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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