Indeed John ..... 280 is a lot of power for a light car .... demands respect.
Power quotes are really problematic ..... different dynos on different days can give varying readings .... and then there's varying 'rules of thumb' people use to try to work back RWHP to what the motor might be producing at the crank .... depending how optimistic they are the guestimate can vary between 20 and 'whatever' HP transmission losses 🙂 .... could be the 305 is 280 on the dyno +25 for a crank guestimate? Which would not be out of the ballpark as these things go.
As Simon says .... if a race series classes the cars by power to weight, they all get dynoed and weighed on rhe same gear .... absolutes don't matter then, just how they pan out relative to each other.
K
