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Thread: ST 90 help
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Old 03-22-2007 | 05:34 PM
  #6  
aerowoof
 
Joined: Jun 2006
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From: pembroke, NH
Default RE: ST 90 help

If you want to run a higher nitro fuel in the st you may need to add a shim under the head to lower the compression ratio.They used to be included with the older engines