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The pistons will be TRD spec units from JE Pistons. The 83.5m bore slugs are 1.5mm over and feature custom placement of the wrist pin and ring set. Note the deep-dish treatment. Piston-to-valve clearance is key in this application, because if the VVTL-i system is retained (which the plans call for later) and lift is increased or timing aggressive is advanced, then interference can occur.