you guestimate? uh, to an extent.hat's when i do the final port on one of them, and i take it out to the flow bench and i flow it. this is a flow bench. it can measure the amount of air that flows through a cylinder head at each given lift. like using flow charts-- 200 lift, 300 lift, 400 lift, all the way up to a desired cam lift, and that lets you know how much air actually flows. this measures how much air flows through the head. if the cylinder head's adequate and i'm happy with it, then i go back in the room and i finish it and i finish polish it, which i can show you a four-valve head that i finish polished that's here. when i'm done with it, it leaves my hands and goes to valve job machine, where i can put you with john who runs that machine, and he can actually probably run it for you. there's still more work to do there, but alan needs my help at the shop taking apart the cutlass. you know what? i think we're gonna need three people. hey, jen. wanna give us a hand for a second? jen: sure, no problem. you go o