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I recently had a similar question on two part numbers for 2.7 engine that looked the same. I emaled JE pistons and the response is below.
261663 is a standard design piston at a weight of about 404 grams
353235 is a newer version of that piston with some extra features and underhead milling making it a more desirable lighter design. 368 grams.
Cost for 261663 is 1622.18
Cost for 353235 is 2367.17
john
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