intake valves are larger than exhaust.
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what aftermarket rods are you using? above ones are Pauter.
on the stock rods there's an arrow or an embossed stamp (eg. P72 12 on the GSR rod) and it should be facing up when you press in the pin (so that the piston's emboosed stamp side is also facing up on the same sidewhen you press in the pin ). on install, the embossed side with the arrow or stamp (eg. P72 on a GSR rod) must face the timing belt side of the engine. on a B18B the oil hole on one side shoulder of the rod big end and the oil hole must face or be on the same side as the IM.
you're using bushed pins instead of pressed in stock pins right? the keeper or lock side of the piston (on the ones that use bushed pins rather than a pressed in pin like stock) should face up when you pop the rod in. pre-oil the groove for the keeper lock on the piston & the small end of the rod liberally using oil or assembly lube .
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