24power

1996 LT-1>>>>changing out thermostat.....do i need to use anti-seize on bolts going back in ?????????Thanks!!!!! :cheers:

65Z01

Generally, when steel meets Al, use anit-seize. There are a few exceptions like water pump and intake but in your case use it so long as the bolts are not going into the water jacket.

SPD DMN

No. I never use anti seize on those bolts. Make sure not to torque them down too tight though.

CAPN17

Use the anti-seize and torque them to factory specs., short cuts are asking for trouble.

SPD DMN

Not sure what you are eluding to CAPN17, but they come dry from the factory. The bolts are not steel and they go only into the aluminum pump housing. This is not a "shortcut". I do not take shortcuts.

JAKE

I use anti-seize on all the bolts that thread into aluminum too. Since head bolts go into cast iron, I use Permatex #2 on those.

With the exception of the new aliminum block engines, a lot of bolts only "pass" through enroute to cast iron, like the water pump, so antiseize isn't needed there. It's where the threads engage that counts.

Steel to alunimum require anti-seize or, over time, a chemical reaction can occur causing the bolt to seize in place.

I also use it on spark plugs into my aluminum heads, although there are some who don't like putting anti-seize on plug threads. To each his own I say.

Jake

vettenuts

I too use anti-seize. However, one must take care with factory torque specifications. There are two ways to obtain torque requirements for a given bolt size and material, lubricated and un-lubricated. Unless the manual specifically states to lube the bolts, then one must assume that the torque value is based on an un-lubricated bolt. That being the case, I always shoot for the low end of the range provided.

CAPN17

Not using a torque wrench when torque specs. are required is a short cut, that is what I was refering to. It is a dangerous short cut to trust feel over gauged specs. No disrepect ment, I am a firm believer in doing it the way the book calls for. :D

JAKE

Right.

Special car should be taken when bolting down the thermostat housing too.

That sucka cracks really easily; it's aluminum. For that matter, even the cast iron version of the housing will crack if not torqued down properly.

Jake

Corvette ED

I always use it.