Hi,<br />When I remove the spark plug from my 1972 85 Hp Chrysler outboard motor, the spark plug steel inserts go together with the spark plugs. I guess that the previous owner had put the spark plug inserts to 3 of them and loctite them to aluminum head. But overtime, the loctile could not hold the insert in place so when I remove the spark plug the insert seperated from the head. I have inspected the thread on the head 2 were good but 1 was bad. <br />Can I re-thread it with oversize insert ?<br />What type of loctite do I use to reinstall the insert back to the head so it can hold longer<br />I also have a good 1971 70 Hp Chrysler outboard head spare. It look identical to 85HP head. Can I use this on 85 block?<br /><br />Thank a lot