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Generally the standard valve reliefs that are made in the pistons (forged pistons) are sufficient for most off the shelf Hipo cams. The piston will be chasing the exhaust valve more agressively than the intake and will need more attention. It's always a good idea to check clearances, during mock up assembly; especially if you alter the cam timing by advancing or retarding the cam at time of installation.
Good luck
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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