Curtis, You really did do your homework.!!!!!! I agree the 413 pistons are not readily available but I would hunt until I found them or punch the 413 out to 426 and used their pistons. If the motor is being torn completely down I feel that is the route to go. I feel if we talked to a guy with a 62 or 63 Ramcharger and he is rebuilding it he is not going to go to 8.1 CR. However he may be a little reluctant to tell us his sources. Thank you for the additional information. Ron
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