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Going to send my intake and exhaust manifold out to be ceramic coated, have a friend that say that they don't want to coat the flanges were the mounting washer or spacers on the manifolds. He says that the ceramic coating will not let the manifold move enough or break off and cause the manifold to come loose and the gasket to blow
Any thoughts?
guess I can always grind it off after I get it back
Thanks for your input
W

Assuming I understand the question, what your friend suggests is contrary to how Packard did it originally at the time. Yes, the manifold surfaces that abut the gasket and the engine block are not porelainized, but the surfaces where the mounting stud hardware went were, at least on the senior engines and I don't see what would require the juniors to be different.

Hello Owen:

I too was not certain if I understood the poster's question correctly. He mentioned "ceramic coating" and that is different from porcelain.

Modern ceramic coatings unlike traditional heat paint do not hold damaging heat and moisture around the part. Rather, the surface temperatures are reduced extending the life of the part. There is a wide range of colors to select, from cast-iron gray to bright silver that resembles polished aluminum.

I have used ceramic coating on my motorcycles and there I would have the entire exhaust manifold coated, including the flanges. Never had a problem.

Meanwhile, I would not coat the exhaust flanges using porcelain as it is much thicker coating and may crack.

More about ceramic coating here:
https://www.qccoatings.com/ceramiccoating

I, too, used ceramic coating on the Speedster's exhaust manifold. If I'm not mistaken, we coated both the inside and outside.

Nomenclature can fail us here if we don't clarify it as the traditional porcelainized finish Packard used is also a ceramic process.

The "ceramic coating" we used was the powder coating type. It won't crack, or tends not to crack. As opposed to the percelainized coating that seem to crack within a short period of time.

As I am new to Packard, I chose ceramic finish instead of porcelain finish because is seem that the ceramic finish will last longer and stay nicer longer than porcelain. I was told that if I use this a a daily driver, I should expect the porcelain last about a year, the ceramic could look good for a lot longer. As this car is a driver ( that why I have it) I want it to look good as long as I own it
I am going to go with no coating where the manifolds bolt to the block or carb, but all the rest gets coated. The surfaces that the washer meet the manifolds are going to coated.
going to take heat rise flapper apart before I send it out, then rebuild after it comes back
Thanks again for all your help, you guys are great
W James

Yes. Our coating has lasted for at least 15 years now, and probably 15,000 miles. As I mentioned, we coated the inside as well. Supposedly smooths the interior walls, to help exhaust escape faster. That might prove useful if you're racing, but it might also prove useful in reducing heat.