When I get JE pistons I give them this:
crank center to deck - 220mm (236mm ABA)
pin diameter 20mm 16V 21mm ABA
stroke 86.4mm 1.8, 92.8mm 2.0
chamber size all 16V 45cc
gasket area 1cc
desired compression ratio
If it is bigger than a 83.5 bore I get them to chamfer the top edge to insure the gasket and the piston don't meet.
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