<https://racerwalsh.com/product/2-5-pistons-5-5-9-1-030-rwa1571-3/#product>
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"RWA 1560 pistons are a flat top design with valve reliefs. These pistons are designed to use a 5.5″  rod length with .912″ diameter pins and the 2.5 crankshaft. The pistons are designed to use full floating pins. . .  Our RWA 1559 pistons are manufactured by Wiseco using 4032 low expansion alloy. These forged pistons are a great choice for street or racing applications. Our pistons come with pins and pin locks. We stock .030″, .040″ and .060″ overbore sizes. If you need STD or .020″ they can be special ordered, give 3-4 weeks for delivery.\r\n\r\n \tForged using 4032 low expansion alloy\r\n \tFlat top with valve reliefs\r\n \tZero deck design\r\n \tFull floating .912″ pin design\r\n \t1/16″, 1/16″, 3/16″ ring size\r\n \t1.158″ Compression Height\r\n \t5.5″ Rod length\r\n \tWeight 360-380 grams"
<https://racerwalsh.com/product/2-5-pistons-5-5-9-1-030-rwa1571-3/>