[obrut]

i have a 2.7 in my RS rep race car with the following basic specs:

10.5:1 JE pistons
2.7RS MFI
2.7RS valves/ports
GE80 cams
Bosch twin plug/twin CDI
early heat exchangers
stock muffler converted to 2 out (2.5" outlets)

the car is mainly used for historic racing and thus i have to keep the 2.7 capacity and the period style induction and ignition. also, as we often run tarmac rallies, i'm stuck with pump fuel and the 10.5:1 comp ratio.

keeping the above limitations in mind, i'm wondering what else i could do to this motor.

notwithstanding the GE80 cams, the power peaks about 7000rpm (i thought it would be higher). i'm wondering if the current valves and ports are the limiting factor.

has anyone used 2.8RSR sized valves/ports on a 2.7?

all suggestions welcome.