Titen,Your post addressed a specific problem I am having with my 59 235. You say the bolts thru the main bearing cap are 1/4" and the holes tapped to 5/16". The bolts in my engine are 5/16" and were threaded into the timing cover holes. I wanted to make the mod that I have read about, i.e. to drill and thread the holes in the brg cap for 3/8-16 bolts and to drill out the timing cover holes to 3/8". That way I could use 3/8 bolts or studs in the cap to attach the cover. I find, however, the holes in the bearing cap are about 11/32" which is a little to large for the 3/8 tap to give a full thread. I am wondering if that would be enough strength to serve the purpose. Anybody else run into this problem?
