What should I use for my 348 cam covers - 'HondaBond HT' or 'HondaBond 4'? Are they the same thing?
Not the same. 4 = semi-drying HT = High Temperature, plus it's non acidic so it won't corrode aluminum. Get the HT.
Hylomar has been discussed several times before. Here's a good thread. http://www.ferrarichat.com/forum/showthread.php?t=206585&highlight=hylomar