If I were to venture a guess, I'd have to say maybe 7.0:1 and no more than 7.5.
Here is an 8.0:1 98mm JE:
BTW, what manufacturer are those? They have some wierd looking skirts.
Charles Navarro, LN Engineering
Aircooled Precision Performance
'99 Boxster powered by Flat 6 Innovations; '10 Cayman S (DFI testbed)