Re: Hot running V8
it could be the ignition timing has changed , get timing checked .
the pre igniting sounds like timing is out .
see below in case you have this problem occurred .
is the locking bolt for the distributor ok, check around the bolt hole
boss to see if engine block casting is cracked at all , if it is get
it cleaned up and ali mig welded, mine cracked here and i couldnt hold
the distributor in place , you might think the bolt is holding it
because it will tighten , but the only way to check is to actually look
an see .
i mig welded mine ok without removing anything, just put damp rags all
around area and plenty water on them before welding .