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427 Piston Question

August 9 2012 at 8:43 AM
Terry  (Login trevorldean)

I have a set of Ross (#425) like-new pistons that came in a 427 I recently bought. They have a ridge (step) about 1/8" down from the top. The top of the piston measures 4.18. Below the step the measurement is 4.20.

I don't recall seeing this on any other 390 piston I've ever bought, but maybe I just don't remember well. This is my first 427 if that's relevant.
[linked image]
See the little 'arc' above the valve reliefs? That's on every piston in the set. I think it was assembled incorrectly and the engine was never run after initial startup.

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