Hi Skot,

Glad to hear you are making progress on your new engine installation.

Regarding my choice to flush the new radiator....if a person decides to do it, that is something that can be done in your shop...no need to go to a radiator shop. My reasoning behind flushing.......which applies to anything that has an inside that can be flushed (hoses, radiators, tanks, valves, fuel filters etc) - for me anyway.....is to assure that I know for sure there isn't any foreign materials that I can't see which might come loose later. For me it's a builder/repairman issue and the level of confidence that I want to see. Some items, when they are received, have end caps or plugs which can help assure that a spider hasn't crawled inside between manufacturing and delivery, etc.

The threaded hole is 1/8" NPT for the drain - should be located on the left end near the bottom - if you didn't get a pipe plug with the radiator, probably best to use an AN aluminum plug (like the one for the firewall mounted brake resivoir) or a brass pipe plug - (don't use a steel/iron plug in aluminum). Since this is a tapered thread, probably not necessary to have a safety wire (my original radiator had a straight thread with a gasket do that did need a safety wire - new one does not)

Keep up the good work!

Sincerely,

Dave S
Kitfox 7 Trigear
912ULS Warp Drive