Thanks for the info.gbritnell said:The oil filter is made from brass. It is 2 pieces, the outer shell and the top piece which has the threads and oil ports. These were silver soldered together. Naturally with having to use heat to solder it there is no filtering material inside but the oil doesn't get that dirty. The graphics were done with rub-on letters. They are available at art and hobby stores. After painting and lettering the whole thing was clear coated. The oil from the pump does flow through the filter and then into the main oil galley. The filter has an 'O' ring for a seal up against the block.
gbritnell said:At the time the engine was built there were no aftermarket plugs available and when I made mine I tapped the holes 1/4-28. Now that Rimfire makes very nice plugs I can't use them because they're 1/4-32.
I really don't want to make another set of heads just to suit the spark plugs.