Cleaning P-45 manifolds

[rapier]

How do I get the baked-on exhaust crud out of my ’29 P-45 exhaust manifolds? Heating and cooling them seems to help, but I’d like to get most or all out before I fire this motor up. Any members have a surefire way to remove tehse deposits?

[lyks2tinkr]

On most of the 20s and 30s manifolds I’ve done it usually takes old fashioned elbow grease to chip and scrape it off.

[jeff-register]

I hear you! Only way to prep it.

[garry-in-michigan]

Oven cleaner ? . . . ❓

[kees]

.
plumber’s torch
but stay away from the neighbours 😡
😆
.

[rapier]

I started with the ultrasonic bath, then went onto a nasty drain cleaner gel, which I was concerned about using…The Elfin Safety instructions proposed doom and gloom if I got it wrong, or heaven forbid, I should accidentally splash some on bare skin. Then followed it with oven cleaner (didn’t work) and finally the plumber’s torch. The torch works well, but I must have burned it off and cooled them down at least 20 times – guess there are no shortcuts or magic mixture. I did wonder if soaking in vinegar might help?

[jcrigan]

Soda blasting works well if you can get the nozzle in there. You can also rattle a chain to knock it loose.

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