Hi
We have just rebuilt a 2.7 litre to RS specification. It has a competition valve job, the cases have been boat tailed, flywheel lightened, compression bumped to 9.3:1. Other than that it is faithful to the original '73 spec. However now it is run in I must say I'm mildly disappointed by the way it delivers the power.
It comes on really strong in the mid range but runs out of steam at the top end. At 2,500 - 3,000 rpm it has fantastic throttle response, lots of low down grunt. Coming out of the corners it is fantastic. However it tails off beyond 5000 rpm. Holding onto it beyond 5,500 seems pointless, better to change up and let the mid range torque do its work. Only trouble is I like engines that like to rev. Having not driven this type of engine before I am not familiar with the way it should drive.
So my question is are they all like this or should it pull like a train all the way to the red line? If the latter it might indicate a fault(s). If so any pointers as to what that might be please
Thanks,
Keith.