Valve head assembly cleanup

[Darick]

I've just received my engine and started checking parts, specifically the valve head. There are areas between the cooling fins which are blocked by excess metal as a result of the casting process. Some places there is a small hole which could be opened by some careful filing. Some places there is no hole but the area could be opened up by drilling a small hole then filing carefully. My question, is there any danger in doing this other than the obvious careless mistake of breaking through a critical wall?

I couldn't upload a picture here but if you go to my website, there are pictures in the ENGINE menu.
(http://Www.expercraft.com/cdgundy) or just search "Light Earth Aviation".
Oops! It seems Expercraft has changed something. Just try the search of Light Earth Aviation.

[radfordc]

You should do this if you expect the engine to cool properly. I used an angle grinder with a thin cutoff disk to open up the fins. I then drilled to open the holes in the passages through the heads. Be very careful not to drill into the ports.