digger,did your modified make power up to 4200? or is that just how hi you got it to spin? no offense man there good motors but just to say ,those stats i gave you are my hi winding 351w in a 70f2504x4 i took it to 5800 blasting through a mud bog winning at a county fair boy did i show 'dem bow-tie punks!!! somebody with more 350\400 expertese will help ya! later, oleblue70