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Jun11-07, 11:35 AM
Sci Advisor
PF Gold
brewnog's Avatar
P: 2,793
Compression height is the distance from the centre of the gudgeon pin to the crown of the piston (the flat bit on the top).

Ring land is the distance between the rings; hence top ring land is the distance between the top ring and the crown.

Ring grooves are the grooves into which the piston rings sit.

I'm not sure about 'deck thick', I imagine it to be the thickness of the top deck taken at its thinnest point.