Well I got my new slant 6 bbd carter last night.
Put it on my supersix manifold, hooked everthing up and fired it off.
Runs great, got it dialed in and idleing smooth.

Then I notice water or antifreeze seeping out around the very back upper manifold bolt. Does this bolt go into the water jacket part of the head ?
Or maybe it does now since I had to drill out a broken stud and retap the hole for a 3/8 stud.

What would be the best thing to seal this up. I was thinking of draining the coolant, removing the stud, drying out the threads, then apply a heavy coating of JB-Weld to the hole and the stud, then reassembling.
Is there something else better to use ? Maybe just silicone ?

Yes, the stud holes back up into the water jacket. DO NOT use silicone or JB Weld. The correct material is thread sealant, which is available from Loctite. You will need to drain the coolant below the level of the stud holes, remove the studs (one at a time is a good idea), spray clean the studs and threaded holes with e.g. brake cleaner, apply the thread sealant to the stud and reinstall the stud.

Thanks SlantsixDan,
I'll stop by the autoparts store on the way home and see if I can get some of that loctite sealant.

It's worth your time and trouble to get the right stuff. JBW or RTV will just get pushed into the coolant system and clog the works.

Loctite 542 is fine


Loctite 592 is the high-temp version

Not if you do it right. But I agree, if they are good threads, go with the 542 or similar. If you've got a buggered up hole, JB may be just what the doctor ordered, though.

D/W<------JBweld artiste and expert.

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If it ain't broke, fix it!

Loctite also makes something called a "heli-coil" kit









... Are we violationg the terms of use?

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

This post is so deleted.

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I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

Hohyeah, don't get me wrong...I once SERIOUSLY buggered-up the rearmost stud hole (think hammer drills, hacksaws, jigsaws, broken-off E-Z-Outs and broken-off drill bits and you'll begin to understand why SERIOUSLY huge amounts of JBW were needed to get it buttoned back up.)

But it's not the right stuff if everything's basically sound.

I picked up the Loctite thread sealer last night,
The threads are in very good shape, I did have a broken off stud, but I was able to drill it out and sucessfully tap it for a 3/8" stud, so the loctite should work fine.
Will probably be this weekend before I get to it though.
Cant wait to get it out of the garage and check out the new super six conversion !

Thanks guys

Make sure that larger diameter stud doesn't put your exhaust manifold in a bind when it heats up. You're probably OK, but the reason for the funky washers and the oversize holes on each end of the exh manifold is so it can expand and move around without cracking when it is hot.

D/W

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If it ain't broke, fix it!

The last head I did, I used some anti seize compound. I did not know about the water jacket issue. It did not leak as far as I could tell.

I am putting yet another head on.
Should I use the locktite, or the anti seize again?

Thanks

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"Nothing in all creation is hidden from God's sight. Everything is uncovered and laid bare before the eyes of Him to whom we must give account."