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I purchased a set of used Twisted Wedge heads. They have a high amount of carbon build-up in the runners, chamber, valve seats, & back side of valves. This is a pretty thick build-up. Will this hamper performance and what is the best and easiest way to remove the carbon. I've tried choke/parts cleaner and the carbon on the valve seats is not coming off. I do plan to have a valve job done before re-assembling the valvetrain. I do not have time to port them. Also the heads were machined for o-ring gaskets, what should the depth of the o-ring grove be? It seems very shallow when looking at the o-ring on the gaskets.

Thanks, sorry for being so long.
 

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Bead blasting would likely be the best bet, could be done while the valves are being done. I have used WD40 to loosen carbon. Soak them and let set over night. After a few applications it will come off.

Not sure about the O-ring groove, is the block supposed to be grooved as well?
 

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Either the heads or the block are grooved for o-rings, usually never both. Depends on the o-ring wire used, but the depth should be around .020-.025 deep for .030 SS wire.

Have you tried brake cleaner to remove the carbon?
 
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