Stock 49, that film completely explains the rod oiling system. The only question for me is why anyone would go to the trouble of oil jets and dippers when all you have to do is drill the crank,a very easy job at the factory IMHO compaired to all that plumbing! I am probably missing something but can't a machine shop drill the crank and get full pressure to the rods? Maybe the way the crank is made there is not room inside it for the oiling holes to be drilled without "breaking through". CNC-Dude, am I correct in beliveing that GMC rods are pressed on at the pin instead of bolted with a pinch bolt? If so it's pretty easy to see a big improvement in strength. Thanks everyone for taking the time to help me learn about these engines. Jay
All the GMC rods are full floating with a bushing. They also have full oil pressure to the wrist pins as well. Many top shelf aftermarket rod companies have now begun to incorporate that feature into some of their rods as well.
