Took the flywheel back out of the truck last night, dad took it by a local retired machinist who doed small jobs for farmers at home, he's gonna mill 6 more holes in the flywheel halves for a total of 12- 3/8" bolts holding the halves together. Got some bolts from fastenal, Dad came home with 12 Grade 9, 3/8-16x2(no 24 tpi in stock) bolts and metal locking nuts. If it shears those off he will just have to buy a single mass kit.
My question..are they a full depth shouldered bolt? You can always remove the threading/cut off if too long!