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Very nice. I didn't realize UEM was responsible for so many piston brands/lines. What brand or technology that UEM offers could or should these pistons be associated with?

found this online from Hot Rod Magazine:

"The minimum safe thickness of a piston depends on many factors, including the specific application, the operator's tuning expertise, quality of fuel, tendencies towards detonation, and the alloy and heat-treat process used by the particular piston manufacturer. For TRW-type forgings made from VMS-75 alloy, a minimum .250-inch thickness is recommended for oval trackers, .280 for street use with average states of tune and poor quality fuel, and .210-.225 for bracket racers using commercially manufactured racing fuel. Professional drag racers may even get down to .170-180 on some areas of the piston flat, but that's cutting it mighty fine. For blown applications, "You can't get the piston thick enough," according to TRW engineer Dennis Novotny. Such engines, when running under boost conditions, experience tremendous pressure buildups due to the greater cylinder filling densities, and are hence quite susceptible to detonation. On these engines .280-inch is the absolute minimum, and the top ring groove should be no closer to the piston deck than .220.250."

Sat in on a seminar put on by him when he was 100 at the PRI show in Indianapolis. He has some stories!

The fuel curve looks better. Timing all in by around 2500 will also help the mileage, watch out for detonation. 1 light spring and 1 heavy or medium spring to tune the timing curve. Use stock GM weights. If in a HEI.