Aye hot use any eletrode slow cool cant go weong even chinese rods be ok cant go wongthey might weld, how to go about it tho, if meany spares i'd be tempted to throw in in a forge get it all FH fire a load of weld in and just burry it dig it ot a few days later and see what happend
The thing that would concern me would be the part you built up parted from the head and ended up in the cylinder.