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More for Less Racer
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I would not run it this way, too much of a compression difference from one side to the other, more than 1/2 point.

Good news is it's an easy fix ;) , just grind the chambers of the smaller head to basically match the larger(get within 1 cc) if it is a chamber shape difference. If the chambers are the currently the same shape, then it is likely that you can mill the larger chambered head .025-.030" to drop the chamber volume down to the smaller head size.

One way or the other you should be able to make them match. A good examination should tell you what you are looking at.
 
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