There is a fix that`s called metal locking also. I didn`t drain the block, just the radiator, on one of my hemi`s one year, it froze on the outer block , underneath the heads, between the freeze plugs. I had seen metal locking done on some of moble oils pipeline engines that burned, that we were overhauling at the time. I did it to that hemi, had it line honed, and raced it for 14 yrs. The car is now being restored, and the block is fine. Altho I don`t think I`d try it in the lifter galley, might be worth a look . I really think I`d junk that 340 block tho.
