B16 turning to B18 ? REbuid STOCK well what i need for to change my B16a2 to B18c1 ? ive seen it's necessary to drill a little the gsr rods for to fit them , what it's all necessary what i need for to turn my b16a2 to a GSR , talking about internals? maybe crankshaft too? what i want not is to drill gsr rods, and i want not to cuy another aftermarket gsr rods..