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Old 09-24-2010 | 08:24 AM
  #1025  
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Maximo
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Originally Posted by xxxntwv
No need to drop head shim.If you run 30% nitro be careful I tried dropping shim and the engine predetonated.Almost ruined it got lucky I found it after 2 tanks.
Not all JL .21's are shimmed the same...some have 4 head shims and some have 3 head shims.....
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