Drifterpilot, I tried to read all the answers that you got, as
I have a very similar problem with my 8.1. What I think I know
about the water pump is their are several pumps that fit the 8.1.
I have been lead to believe that the correct pump has 7 vanes or
blades while a lesser pump has fewer.
I carry a Delco pump with me at all times, that I paid less than
$100 dollars for. I need to take the back off of the back and
check that it has the 7/8 blades.
Do you think that you have fixed your problem? If so give us
what you think fixed the problem!
Thank you for your time and anyput.....Tenn.Vol.
Also had a friend that had a fan clutch replaced yrs. ago
in a 454 MH, the fan was for a light duty car/truck.
ANd of course he had to have it replaced again !!!