450 red diamond pistons

RD560

Member
Does anybody know how big a rd450 can be bored out to after pulling the sleeves out? Ive heard that after pulling the sleeves out it can be cleaned up to 4.530'', and ive heard that it can be bored to 4.6''. I dont want to hard block it. Also, who all makes pistons for this motor?
 
There are no new pistons avalible for the red diamonds, nos if you can find them. I Just put one togeather that was bored to 4.560, only problem was getting the rings past the counter bore in the block.
 
how much compression did you run and how much was the pistons? does going this big take the counterbore for the sleeves out?
 

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