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Thread: Head Shimming for 30% or 40%
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Old 08-09-2004 | 08:21 PM
  #5  
rangulo
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Joined: Aug 2002
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Motorman
I need some clarificartion to the explanation you gave us. Having high compression advances the time of combustion. Running a hotter plug like a 5 will also advance the timing. Lower compression and colder plug like a 9 will retard the timing.

If in florida we are at see level and the air is more dense;so how would you set the same motor up as far as compression and plug using your .018 head clearance theory?

Did you mean that in some cases motors can be run with stock head shimming and 40% as long as a 9 plug is used and a good operating temp?
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