ORIGINAL: Ken Kehlet
The LEO Engine is a good Sport Engine. About the same quality and durability as a MAGNU ASP, BRAT, Thunder Tiger, or Bluebird. Maybe not as good as a O.S. Engine, but the price is well below the cost of aO.S. engine.
Regards,
Ken
Those engines you list there. Most are OS clones or older engine designs OS sold. They are just as good as any OS because at one time they were OS. Sometimes even better because the orginal designs were better than some of the newer designs. So I have to respectfully disagree with your statement.
To the OP what % nitro are you going to run in your LEO? That can determine what plug to buy. Longs are what you need. We just need to determine heat range based on the amount of nitro in your fuel. If O% nitro you will need medium or Hot (Low Nitro plug). If you are not sure buy a few of both and try them. Whatever runs your engine the best will be what you want.
Good Luck!