is there an average mileage at which the intake gasket seems to go?? im pushing 86,000 and just wondering...

Do you mean the upper intake manifold and its cracking problem?

I have seen 80 -100K...if we are on the same page here, keep an eye on the coolant and watch the oil when you change it

And keep those temps down. The 180° thermostat and tranny cooler can help delay, if not prevent this from happening.

Mine went out at 66,000. The only indicator I had was #3 cylinder misfiring alot and the #3 plug kept getting fouled. Then one morning it wouldnt start so to the dealership it went to get fixed under warranty.

ok i yea i ment the warping/cracking.. i was 1/2 asleep when i wrote it. anyway, i was just wondering im @ 86,000 on the original intake according to the manufacturing indications on the top of it

ok does this apply to series 1 or 2 engines? sc or nsc? what are your typical warning signs?

will any 180 stat work??

Read this:

http://www.bonnevilleclub.com/forum/...pic.php?t=5349

It somewhat applies to the Series I as well, but mostly the Series 2. SC models don't have the problem. Any 180 will do, as long as it fits! I also suggest an additional tranny cooler to keep the overall drivetrain temps down.

Joe,
I'm not sure if */C and N/A use the same themostats, but your local part store should have a cross reference table to tell you what 180 stat would work with you car

Do 95'* have the plasic intake, or is it another one of those things where they made some with and some without?

All NA 93-current use the plastic upper, but the design changed somewhat in 95 with the Series II. Some 92'* use a one-piece aluminum, but others use the plastic upper.

All SC and NA Bonnevilles use the same stat.