360 piston id and compression test results

If it is .030 over, then it has received a drop in compression ratio from stock. The 71 360 was the only LA 360 that had a higher compression ratio from the factory, due to a longer compression distance. Those pistons have never been reproduced, so they had to be replaced with the 72 and up pistons, which lowered the compression ratio. As with all Chrysler engines of that era, actual compression was lower than stated. Generally, 360s of that era are under 8:1.