Originally Posted by asw7576
Only when you are using 30% nitro or more, then additional shim is needed to prevent early detonation, and/or to make idle better.
BTW, do you know anyone who can produce NSR S5 sleeve only ? I want to buy bunch of them.
Try Edward at Palmaris. I know he makes Piston\Sleeve sets for Novarossi engines.
http://www.palmarisracing.com/