becouse IMO with the super short skirts thats used in the 512, theres roughly 1/2 the support in
the bore as compared to a relativly stock setup. which cause the piston to load the trust side of the
bore like nobodies buisness. also I believe that the p/pins are into the oil rings, reducing oil control
of those rings. not saying its a bad motor, becouse its not. Its just not a reliable street engine. way
better off going with the 400/470 for the long term street use.