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02PHRS1 500Hp21 Z

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The chambers ended up at 82 cc with bigger valves of 2.190/1.730 inch. Also, the valve seat angles were changed from 30 to 45 degrees to promote better mid-lift flow.
A Side Oiler Like We've Never Seen

 The chambers ended up at 82 cc with bigger valves of 2.190/1.730 inch. Also, the valve seat angles were changed from 30 to 45 degrees to promote better mid-lift flow.  View Related Article

 

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