More information after the video was made. I have concluded that the exhaust on this engine is identical to others provided on similar vintage FA-80GK engines. perhaps this was a transitional style or one just for the 80GK engines.

Also the lack of a diamond HH stamp under the left lug indicates a US distributed engine prior to 1993 from Horizon Hobby. It could also mean that it was an engine never destined for the US market, as this stamp would not be present on engines sold in countries OTHER than the US.

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