340 .040 over pistons for Zero Deck...Where to find?

I don't know of any OTS pistons with that CH with a SBM pin diameter...besides, if you need THAT much of a reduction in CH, the deck may've been cut a little more than normal, and dare I say too much. Like moper said, the blueprint deck height on a SBM is 9.6", and those DSS pistons I quoted above, even with the 1.802" height are .020" in the hole with a blueprint height...he also mentioned most uncut blocks are taller than 9.6" so unless the block has been cut--a lot--you probably don't need anything that short.

Working with your numbers, a 1.74" CH piston, with a stock 3.31" stroke crank, and a 6.123" stock rod, will put your pistons to 9.518" above the crank centerline at TDC...that's .080" in the hole for a blueprint cut block (9.6")...so, why are you particularly looking for 1.74"?