04-02-2020, 10:46 PM
Right or wrong, on my 1 1/2" rods I am using M8 cap head bolts with a shank that fits snugly into the meat of both rod and cap. I have had to use a bit of emery on them to get them to fit the 5/16" holes but now have what I understand are referred to as "fitted bolts". I have chamfered the heads so as to clear the camshaft, and this leaves enough of the internal hex to allow for an allen key to orientate the bolt whilst tightening up the nyloc nuts. I was fortunate to have the original Nippy style bolts, which locate in the rod by a pin as others have said, and so had a pattern for the dimensions of the chamfering required. My only worry is if they were able to rotate in service and so foul the camshaft, but I think if this occurs the whole job's knackered anyway.
The bolts were fitted with temporary nylocs prior to white metalling. Torque is 19 lbs/ft.
The bolts were fitted with temporary nylocs prior to white metalling. Torque is 19 lbs/ft.