I got some YZ465 pistons you can try.
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Harold Snyder
1980 YZ465G (owned since 1984)
1980 YZ465G #2 (Project For My Son)
2007 YZ85 (sons)
1970 Dodge Dart 622ci, 1404hp & 1076tq (IHRA Top Sportsman)
2008 JR Dragster B&S 40hp (sons)