Author Topic: Why do I need to paint my new cylinder head??  (Read 1385 times)

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Aristotlejones

  • Posts: 28
Why do I need to paint my new cylinder head??
« on: Jul 20, 18, 14:52 »
Hey all,

Just received a new AMC cylinder head after I did a stupid human trick on the original one. (81 Rabbit pickup)
I'm getting conflicting and incomplete information on painting hi-temp aluminum, and then started to realize that I may not really need to paint at all. Alum oxide forms to protect the surface of the head, and bare alum likely transmits heat better than painted. (assume appropriate masking of non painted surfaces)

Anyone have any opinions on whether I should paint or not?

And if paint is the advice, what kind of primer/paint should I use? (I have a can of plastikote hi-temp enamel, and can get etching primer at our local store, but the info on the can won't say if it can take the heat)

Thanks ahead,

<*>aj

aba16v

  • Posts: 955
Re: Why do I need to paint my new cylinder head??
« Reply #1 on: Jul 20, 18, 15:35 »
It'll be fine bare

AirCooledRules

  • Posts: 5645
  • Salmon S3X Pink Metallic
Re: Why do I need to paint my new cylinder head??
« Reply #2 on: Jul 20, 18, 15:43 »
Heads are never painted from factory
Kiełbasa > Kolbasz

Qogu

  • Posts: 432
Re: Why do I need to paint my new cylinder head??
« Reply #3 on: Jul 20, 18, 16:22 »
Do It Hemi Orange.  :thumbup:

Autohau5

  • Posts: 6802
  • Gasoline rainbow in the gutter
Re: Why do I need to paint my new cylinder head??
« Reply #4 on: Jul 20, 18, 17:14 »
I've painted many aluminum heads before, never had an issue with overheating. Heavy duty truck and off-highway engines (CAT, IHC, Cummins, Kubota, Deere, DD, etc, are completely painted pan to valve cover, and have been for decades, without issue.
'81 Rabbit S 16VG60   |  '15 Touareg TDI R-Line   |   '96 YZF750R

vinister

  • Posts: 790
Re: Why do I need to paint my new cylinder head??
« Reply #5 on: May 22, 19, 14:14 »
nothing wrong with leaving it bare except for it gets very ugly.  I would definitely paint it, use this: https://por15canada.com/por15-store/engine-enamel.html

POR is a really tough coating and relatively easy to clean.