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Old 01-19-2007 | 01:14 PM
  #1893  
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Grinder
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Originally Posted by joemugen
I am about to break in a murnan +12 sct. I use 30% nitro, do I need to shim this engine out. If so, how much?
Hi Joe. You should add one .1mm shim at least where you are. I believe the engine is still stock. If you only see one .3mm silver shim under the head, you should add a shim. I have ended up running .2mm above stock in Florida.
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