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No real difference they will both have the same sort of power. If the 18R is good then run it otherwise re-build the 21R and run it. It will be a little lighter due to the Alloy head.
18Rs have timming chain issues.
i am going to run the 21R for now it is a little rattley when cold due to the oil pressured timing chain thing in it - but will hopefully get me through a few months till i decide what to do
http://www.budscustoms.com.au
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