9C1 cam with stock TBI?

[blackdeathmessenger]

An "880" block may or may not be drilled for the coolant bypass needed on the TBI cylinder heads.

This is a double-drilling, one hole down from the cylinder head gasket surface, at a goofy angle. The other drilling intersects the first one at the bottom, and leads to the water pump gasket surface.

I have the sense that most "880" blocks do not have this double-drilling. I've seen some that do.

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The matching hole on the water pump gasket surface is the reason that SBC water pump gaskets have the extra, smaller hole under the water pump outlet hole.

I am aware of those two passages. I didn't have anything to help my drill bit stay aligned for the one that goes through to the head, but I did drill the one for the water pump. It seems I ended up getting an engine that was from some kind of industrial application. Haven't had any overheating issues even without drilling the one hole