bbc running oil clearance and steel cranks
	
	
		cast or steel  cranks . it dose not matter if the running oil clearance is  not right.  this  is more useful so you do not weld the crank to the bearings. it should be check on all rod s @main s with a bore gauge. not  plastigage i like the main @ rod to be on the small side of size this help bearing from hamering . this keeps the bearing  crush for better seating in to the main bore and rod bore. the bearing i like are mich 77  or kings and is fare as steel and cast cranks  on big blocks mid stock to 500 hp in a lite car .on nos or blown  500 hp and up with nos and blown. i have had good luck with  scat 4340 for the money.but it will take only so much  callies make good  crank and they are a more$$.  if looking for a steel crank look for non-twist forgings and  a good alloy  here are things to think about cast cranks are not twisted when made so there is no stress built  in to the crank .cast cranks  when spun can be re ground.the bearings do not weld to the crank like steel so there is less damage some times . steel cranks crack this can be from harmonics steel dose have a hi amplitude than cast so hi cylinder psi and harmonics can make it crack but steel is ease to fix and will take more twisting than cast :whacked: