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Locking Device? It's just a nut on a threaded stud.
Perhaps I'm missing the question.

Before going to the next fractional oversize be sure to check the metric next oversize. In some cases the metric requires only tapping of an already stripped fractional hole.

None on my car. The nut presses against a retainer that holds the manifold ears to the block.

See this picture for what I am taking about:

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Is there no flat washer, or split ring lock washer or sheet metal fold over tab on, under or around the nut????

Certainly not on mine. Mine's pretty much exactly what BigKev Has.

Not on my car when I got it. Nut straight against the retainer which distributes the clamping force between both manifold tabs.

ok.

Quote:

Well, minus all the "new and purdy."

Speaking of which. What paint did you use on the manifold?
I've thought about doing that while I had it out.

I used Eastwood "Fresh Cast" Manifold gray. Still looks this good after multiple heat cycles. Surface prep is everything. I stripped the manifold to bare metal first.

The manifolds were not painted from Packard. They came as natural cast iron from the factory. So I think this looks pretty good and hopefully will keep the rust at bay for a long time.

I also had good luck with POR15's manifold grey paint. Used them on my cast ram air headers on my pontiac and after 2000 miles they look like i painted them yesterday. like kev said, prep is everything. Mine were new repops so they were clean. Also, follow the directions exactly with recoat times and heat cycles.

Just had my two manifolds blasted for me by a local place that charged me $25 (well worth it to not have to deal with that exhaust manifold in my small cabinet with my small air compressor) Also, they make a black high heat paint (only 1200F vs 1400f for the manifold grey) called black velvet if you don't like the factory cast. I plan on doing the intake with black velvet and exhaust with the manifold grey.

For exhaust shields and anything down by the exhaust or near high heat, i've been using rustoleums bbq black grill paint. It will stick to just about anything without prep, it lays down as a decent semi-gloss and looks good, and doesn't flake or peel when by something hot.

I have about 8 different kinds of black paint that i've played with over several projects to see what covers best, sprays easiest, works for what purpose, etc. When my motor is finished shortly i'll post pics and point out the different paints if anyone is interested.