The 360 build that has more turns than Willow Springs

Kern Dog said
Those are what was in this engine:

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All the pistons look about the same. Some carbon but it cleans off with solvent and a Scotch Brite. I was hoping that I could reuse these but a few cylinders need to be bored just to clean up the rust pits. I may keep these for a future build of another engine.
I go back and forth with every big decision and piston choice is yet another one of those. If using those Magnum based pistons means compression drops to 8.5 to 1 or lower, I'd skip the idea of using them.

The piston deck oppo the stamped one shows detonation alley, that's what it looks like, & that's what's killing the gaskets. You're makin' the right call on the new piston choice, You can work the tune & avoid it, but You'll be able to make plenty of oats w/less squeeze/headaches.