Stans 57

An article in the latest car craft magazine about a 80 model Malibu build in North Carolina with a 6.0 carburatred engine (I'll assume a '99 truck engine as he was using a 350 trans) where the man said he eventually had cam bearing noise (not unusual for these motors he said.) I have ever never heard of that but evidently it was serious enough that he swapped over to a 5.3 engine. Huh??
Thanks.
Stan