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well for starters the front cam Tower has a oiling problem. I first saw this from Indiana on his B2600turbo site. http://i139.photobucket.com/albums/q299/I-W/Cam%20Tower%20Oil%20Mod/C8C8BAC9-2462-45EB-8B50-65BE71B99899_zps13fynwva.jpg http://i139.photobucket.com/albums/q299/I-W/Cam%20Tower%20Oil%20Mod/9634E5E0-1545-4E29-85B0-9CB5E015AA08_zpsev8mempi.jpg http://i139.photobucket.com/albums/q299/I-W/Cam%20Tower%20Oil%20Mod/31D3643A-8FF6-432A-A903-7CE97B6DB4B9_zpsofxkzb64.jpg The front cam tower on the bottom has a oil feed hole from the block. it passes around the head Bolt and through the head to the bottom of the front cam tower. then as you look in to the oil feed hole that is drilled in to the cam tower. The hole size is 2 extreemly different sizes. as i measured using drill bits, primitive i know but all i had for sizing. the first pic shows a 3/16th drill bit in the oil feed hole. http://i139.photobucket.com/albums/q299/I-W/Cam%20Tower%20Oil%20Mod/119A328F-4E89-469C-A50B-FB1B1DF0EA85_zpsdulp0hqy.jpg the problem is this hole is not drilled all the way through. as you look in the oil feed hole, there is a smaller hole that is about 3/32 in size. http://i139.photobucket.com/albums/q299/I-W/Cam%20Tower%20Oil%20Mod/54008849-A24E-4438-9AF8-70580F4AD90B_zpse2i0l0wf.jpg http://i139.photobucket.com/albums/q299/I-W/Cam%20Tower%20Oil%20Mod/E1B3ABBD-048B-4BD4-9A8F-0B63A99DB987_zpshjemtkjc.jpg NOW if i am correct the engine oil flows from the front CAM tower to all the lifters and rockers and CAM, this 3/32 hole is supposed to supply oil to feed the entire CAM assembly. i measured the oil feed hole in the head where the cam tower oil hole alignes with the head feeding hole. the oil feed hole that passes through the head from the engine was actually larger than the feed hole in the bottom of the cam tower. it is 7/32 in size. this is the third head i have seen with this same problem. 2 new clearwater heads and now this magna head from australia. i honestly dont know what the proper size these holes should be? do i drill all the way through the 3/32 to make the feed hole all 7/32 to match the oil feed from the base of the head? Thoughts? Comments? Suggestions are Welcome.