complete 72 340 engine In Chicago

[EL5DEMON340]

Those are not factory 72 pistons,I have never taken a stock 72 & up 1 apart that had 4 reliefs per piston

They sure look like 72 low CR pistons, i have a set of 8 in my garage just like that off a 72 340 warranty block, good sign block is most likely standard. Now the ones in my 71 demon block are the high comp 2 valve relief

 

[Sedanman]

Hmmm

 

[Sedanman]

I measured the valves & they are 1.88"s