I got a chance to weigh the piston/wrist pin assemblies on our digital
postal scales here at work, they are accurate to .1 oz. The wrist pins are
rather tight to the pistons at the moment so I decided to weigh them with
the piston since they will move with the piston anyway.

The KS piston I thought should be heaviest because of the "+" on top
actually turned out to be the lightest by a large amount.

Here are the weights converted to grams -

Mahle pistons marked with 93 97 - :
677.55 (1# 7.9 oz)
680.39 (1# 8.0 oz)
686.05 (1# 8.2 oz)

KS piston marked with 93 98 + :
660.55 (1# 7.3 oz)

Just goes to show that what you see isn't always what you've got.  I've
really wondered if someone worked the top of that piston a little, it looks
very different under the scope than the others from a surface finish
perspective.

The other engine has 2 cylinders removed due to the head problems, maybe one
of those pistons is a match for the other Mahles.  Hopefully I'll get a
chance to look some evening this week.

Joe