Simple question but I don't know the answer
 

Should we use anything "thread-loc" on the exhaust manifold bolts when installing the exhaust manifold back onto the block??

It's a two way street. Sometimes the gaskets need to be retorqued. Sometimes you nne the thread-loc to keep the bolts from backing out. Look at it this way...which ever way you do it will be wrong. Does that help? :D

They're usually impossible to get off even without thread lock. If you are using lock washers, dont bother with the thread lock.

just the opposite...anti-seize...but the above is a correct statement...be sure to check the torques.

Iron or Aluminum heads??

Use Antisieze if aluminum. We don't use anything if they are iron. Personal preference I guess.

I do use locktite other places on the block though....

I use anti-seize on the exhaust manifold bolt threads, but I use lock-washers too. They are usually quite easy to remove, but don`t back off either.............

I anti-seize so I can get them off next time. :D Usually check to make sure they are tight a couple times when I install new gaskets. Once they take a set I have never had a problem with bolts getting loose or coming out. Just my .02.

Mercury offers a "anti corrosion grease"that doesn't have such a high aluminum & copper content in it. If you are in a saltwater enviroment,regular antisieze can promote corrosion because of its additives. Just a recomendation.

LMAO a simple question:eureka:

Poor guy gets 10 different answers:D

haha good one Scott. I never use anything on the bolts holding my Gils on , but then again, I seem to have them off way to frequently anyways. Dont use locktite, dont use neversieze unless you can check the torque reqularily. My $.02.

If they are stainless bolts going through aluminum manifolds use some type of antiseize or the bolts may seize on the aluminum. There is no engine builder I know that ever recomended lock washers on an exhaust manifold. I have always been told to use a plain washer. Exhaust manifold washers are usually a little thicker than a standard washer I believe to deal with the additional heat. Rick G.

I think what Rick meant is if you are using stainless bolts going into aluminum "heads" use an appropriate antisieze. Then again, I think stainless fasteners are only for "pretty" engines and not "working" ones. And yea, thick washers or flanged bolts, not lock washers, they break and fall out and then the bolts are loose