72 compression ratio

[Greg Perry <rgperry@earthlink.net>]

Hello,

I was just looking at the engine specs by engine number suffix

HE indicates high compression
LE indicates low compression
U  indicates U.S.A. Market (later vehicles only)

TR6 (U.S.A markets) 
Pre 72 - 8.5:1
1972/73 - 7.75:1
1974/75/76 - 7.5:1

My engine # is CC83111UE.
What does the E in the engine # suffix UE represent.
What compression ratio is this engine 8.5:1 or 7.75:1?
The engine has dual exhaust and 175CV2 carbs.

Thanks,

Greg Perry