As many of you may know we have been struggling with an internal water leak on this block since it was new.. causing premature hone damage.. that being said when it runs it runs strong. This is a naturally aspirated engine.. that lives in an extremely harsh environment and it's put to the test every pass.. we tore the engine down to clean install some epoxy in the block And hone.. upon disassembly we noticed the block was cracked at the three Center cam bearings.. the block is extremely thin there because of its design it is approximately approximately 7/16 of an inch wide from the bearing register to the oil drain Passage..