FYI - 2.3L Fords during the 1976 model year (i.e. Carpi II's, Pintos, Mustang II's) had 9:1 motors.

The Mugen CRX driven by Peterson, Johnstone, etal, in GT4 during the mid 80's was a tub car, not a tube car. Kirk Olson's GT5 CRX is a tub car and set the track record during this year's runoffs in a very inspired drive!