I got my bottom end put together today and torqued it all down, and then I put my oil pan on. The crank hits the pan . I think you can hammer it out. can anyone give me any input. and what is the difference between a 350sb and 400sb oil pan. I work at parts store part time and we do not list an oil pan for a 400sb. by the wq=ay on a different note I have a bit of info for you guys this may be old news but I am going to throw it at you all anyway. mellings part # m155 is an oil pump for the 97 and up vortec 350. this pump uses a 5/8 pick up tube hole instead of a 3/8 like the m55 pumps. it bolts in and works. this will increase the volume of oil flow but only increases the pressure less the friction loss of the smaller diameter hole. you can also get this pump in hv. oh you have to use the steel shaft with steel bushing and pin with this pump.