Quote:
Originally Posted by terry_b
one problem is that I have some really carbonized valves. Way worse than I thought, and I was having trouble with the walnut media just sticking to everything in the port. It did seem oily still, an my intake manifold was a mess! I never cleaned it after installing the catch can, so there's a chance its just residual oil, but I don't know. More to come...
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I believe the walnut shell blast is a final treatment, not an initial one. I can see how the initial oil buildup in the air pathways/valves would be a magnet for the shells.
Sounds like an upper induction cleaning followed by a manual wipe of any remaining oil, then the shells would be a reasonable approach.
I'd like to see some "after" pics when you get a chance.