I like the photo of the head bolt with the slot in the threads.That should really improve oil flow considering on a 235-261 the oil does not go past the bolt thread,take the time to actually check out the oil passages in the head.
since i had to take pics of mine for further documentation i was looking around for what i was going to shot and how to write it up. first i removed the bolt and shot it. i then was staring down the bolt hole as to how the oil flow actually went. i looked at it some time ago and figured it out without the bolt in picture. something caught my attention to detail today with the bolt, bolt hole and the oil galley itself. i took the plug out of the block and shined a light in it and saw light at the bottom of bolt hole. i wondered how the oil got past the bolt. so i put the bolt in and looking in the hole in the block i couldnt see the bottom of the bolt. i thought how will/does this work. since light doesnt bend i couldnt use that. i blew air in the hole in the block with the bolt installed and torqued and air came out full force of where the oil connector for the rocker assembly sits in. i was confused but after shooting air in it a couple of times i take it they made a way for the oil to get past the bolt and into the galley.
as soon as i can link the pics ill post them.
