Can you just replace the main bolts if they've been done more than 5 times? What about rod bolts? Ive always heard if you replace bolts that the rods will need resized?
When you replace the rod bolts, you have to get the rods re-machined. The knurl on the shoulder of the rod bolt locates the cap on the rod. Changing the bolt, will change the location of the rod and cap. This can cause the cap and rod to bind on the crank. So when you change the rod bolts, you have to have the bore remachined to compensate for the new alignment of the cap and rod due to the new bolts.