anyone know if these SMC or composite series 2 L67 valve covers can be powder coated or what temperature rating they have?

What can I say, I'm bored.

I thought of doing that myself a while back but never did. I would guess they can safely go to 200*, perhaps 250*. 300* may be pushing it a bit. But I can't say for sure. If you do do this, I would be very interested in seeing your results.

You need them to be metal to power coat.

some plastics are safe for powder coating, does not need to be metal.

I'm going to think about this for a while and see how long cure times are at a lower temp, I'll let ya know the results.

u cant powder coat them my dad does powdercoating and plastic coating and he said thell warp and not fit right at high temps u dont wanna ruin the integerity of the valve cover or ull have problems down the road of them leaking i just painted them with some high temp plastic paint and high temp clear and they came out sweet and still look good no problems i suggest new valve cover gaskets and clean the head surface and use some permatex other wise thell leak hope this helped u out a lil bit

Warp L67 valve covers in particular?

Dunno if you are doing this just to save money but they do have powder coated aluminium covers. I got a set when I blew a chunk out of my front valve cover.... = P

money is always a issue, lol.

other wise I'm just bored.

all 3800 valve cover are the same plastic materiel and exstensive heat will warp them or milt them, like tom said there are some nice aluminum ones or paint them urself the cheasest way of doing them