BTW, all the chevy 6 194-292 use 1/2" head bolts, in fact all the bolts are same size throughout the engines.
We drilled the head bolt holes in the head larger to make it easier to remove the head with head studs. I think that is why I keep thinking the bolts were different sizes. The head came off every pass at the races, so larger holes makes the on/off process easier and faster between rounds...
