These just arrived back from Tom Sparrow of Prairie City Porcelain. The original castings were pretty crude with fins and bumps all over. I did a lot of grinding and porting and generally smoothing inside and out prior to sending them off, and I replaced the studs with stainless steel, but it seems like it was all worth it now that they are done.
There is one rather sizeable casting flaw in the number six ( that's the one in engine front or the far right in the top shot) right at the top of the manifold. If you try to weld this to fill it, the porcelain generally won't stick to the repair. The porcelain actually goes on pretty thick and covered a fair amount of the problem. I didn't want to risk cutting too much away at that point and Tom agreed that I shouldn't go any further. You can't see it here but the inside is also coated. If I had a car I could put these on.
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