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Re: Help finding some parts.
72,
.020s are available in a casting, but not a forging (unless you order "customs"). The Sealed Power part number is: 400NP-020. The rings are E-299K-020 (for moly) or E-299X-020 (iron).
.020 over is not a "popular" oversize, as .030 and .060 are more the "norm". If the cast piston is adequate for your application (no nitrous, no blower, consistent fuel supply), go the .020 route.
You may need a shop with a hone equipped with "diamond stones" to go .020 accurately. Often, a boring machine will not "clean" a bore at .020, and will require .030.
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