The big truck engines that come to our shop all have full floating pins with bushings. The rod is drilled from the big end to the small end so that the pins get get full oil pressure. I have never seen a pin failure or any visable wear. We do not check them because the piston,rings,pin,and liner are all just replaced with new and reconditioned rods are put in. On the newer engines the pistons are 100% steel. How they stay together being that heavy amazes me. Are GMC rods drilled through the center also? Jay
