We are running in my sons buggy a 3mm stroked crank, 62mm cylinder and the 4 valve head using the piston which come with the kit with 2 valve reliefs and have had no issues in the past 2 years. The important thing is to check for the proper valve to piston clearance which I have yet to run into any problems with. I've only located one person who sells a bore with the 4 relief piston and its only available in the 62mm so far, but as mike had said it is pricey probably due to the piston. TOM
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