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Different carbon buildup on heads

Different carbon buildup on heads

 
Old 06-17-2017, 06:51 AM
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Default Different carbon buildup on heads

Pulled my heads to replace turbo/manifold seal (long story).

Anyway, one head has a little carbon buildup (what I thought was normal). The OTHER head is clean. All around the valves, where the spark plug is threaded. Clean.

In one photo you can see the silver valves are blackened a little. In the other photo, they're all clean.

The car has only been run with these heads for less than 30 minutes in total.

What does it mean? Am I leaking coolant in one bank or burning oil in the other?
Attached Thumbnails Different carbon buildup on heads-img_6844.jpg   Different carbon buildup on heads-img_6849.jpg  
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Old 06-17-2017, 06:52 AM
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When I replaced them the head gaskets were obviously replaced.

EDIT: and new head bolts, of course.
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Old 06-17-2017, 06:55 AM
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My fear is that my overheating incident last year caused the block to crack, somehow.

The heads themselves have been inspected by a machine shop, and machined when I did all the valve work.
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