I would run whatever gap KB says to run. If you do not, they have been known to rip the top of the piston off.
Stronger than a forged ? Maybe a TRW but they were stronger than a Ross, JE, Diamond ect they would be in use for high HP builds.
I have always known them to be somewhere between a good cast piston and a forging, but you can get away with less piston to wall than a forging.
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