The holes are not threaded. There is nothing else bolted to them. The bolts go through the bridges, through pivots, and down through arms and into the head. I'm thinking just take them out. Wouldn't the pivot and bolt keep pushrods and rocker arms doing what they're supposed to? I went to the only parts store around that had some bridges in stock, and they were the same dimensions as the ones i have on there. So, i'd vote get rid of them, right?
Big Jim, i'm gonna have to send you a housewarming gift for this! <img src="/forums/images/graemlins/lol.gif" alt="" />