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96" to 107" good bad and the ugly?

58K views 17 replies 12 participants last post by  Don Dorfman  
Many folks bore stock cylinders to make 107" with no problems. I chose 103" because I was worried about heat... Thats just me personaly.... Can Mackie not recommend a good static compression for use with his heads?
 
What kind of mileage are you 107" runners getting?