Originally Posted by kentactic
How does a rod hit a lobe on the cam? You mean rod hitting the bottom of the cylinder wall?
Im wondering if im going to need to clearance for the rods in my 383.
You want to clearence the block. Not the rods if at all possible. A rod hitting the cam lobe is possible and usally more of a problem. If so you need to get the same cam cut ln a small base circle. It will cost a bit more than normal cam but easily done.
You can also buy rods and rods bolts that will clear but they cost a more than stock as well. Do you have an engine stand you can rotate the engine on. If so pull the pan and see where it hits if nothing hits below you may want to check for a loose bolt in the cylinder a small retreival magnet will grab it you may not be able to get it out but if you find the problem then its easy to solve.
Did you have it bored? Any chance of rust in the bore. Also all the valve spring up at the same hieght with the rockers backed off?