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Old 07-17-2006, 05:10 PM
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Blazin72 Blazin72 is offline
You got a leaky spark tube...
 
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I have Sportsman IIs and have been running about 9.8:1 compression for about six years now on 92 octane with no problems...

You have to remember that the modern combustion chamber designs can tolerate somewhat more compression than those on the older heads.
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