Northstar Engines and System Technical Discussion Discussion, Older (95) Northstar Re-Torque? in Cadillac Engine Technical Discussion; Looking at a 95 Eldorado with fairly low miles and I am having a hard time finding info on this ...
If the car has less than 25k miles, and you're looking to try to re-torque the cylinder heads, I wouldn't touch it. If they've lasted this long, they'll likely last as long as you ever own it (seriously). Trying to re-torque head bolts on a 12 year old installation is asking for trouble.
Edit: I should say, the required maintenance would be draining the coolant and refilling (no need for Dexcool in your application, just regular green coolant) and adding a package of the cooling system sealing supplement tabs.
Automobile(s): White Diamond '03 DHS (with floor shift)
Re: Older (95) Northstar Re-Torque?
Well, I recall the Guru saying that after many years the fibers get chopped up by the water pump impellers and become less effective. I would have to guess that that it is longer than the coolant change interval.