No thats right you weld up the side away from the crank pin and grind away the other side, but in actuality the whole pin gets ground all the way around. Whats being done is the crank pin is being moved farther away from the center of the mains. I haven't been inside one of these engines yet but from what I am seeing I am guessing it isn't actually a crank pin in this engine but a one piece crankshaft. I mean the big end journal when I say crank pin.so at TDC the piston is higher in the cyl. and lower at BDC making it a longer stroke hence "stroker"

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