I have a set of 6.100 Manley Performance Sportsmaster Connecting Rods and I am trying to find a set of forged pistons. The problem is every were I look I see pistons for eather 6.098 or 6.125 but know 6.100 rod length pistons. If I use the 6.098 or have to order a custom piston. This is for a stock cub. motor.
Thanks,
Matt

 

the piston to rod length relationship is to assure that the piston is in the correct location in the cylinder at TDC. if you use a piston setup for a 6.098" rod on a 6.100" rod you only change the relationship by .002.
so if a 6.098 rod and 6.098 piston give you have an out of deck height of .010 a 6.100 rod and a 6.098 piston would give you an out of deck height of .012. not a big deal, a little machining of the piston would cure that, if needed.