Rough benchmark for a good race-spec 2 valve/pushrod engine:
100 BHP per litre (at flywheel) - eg 1300cc / 130BHP
80 BHP per litre (at wheels) - eg 1300cc / 104BHP
At 7500-8000rpm.

if thats at the wheels its pretty good. if its at the fly subtract approx 20%.

still not bad. similar to boof heads a12

Have you dyno'd it to get that figure or is that what your told ?
104 is respectable enough depending on what its in and being used for

hi all, i just bought some a13 engines in from the states , i have an a13 (for class reasons) with twin 40's elec ign(+ all the fruit ,apparently) and a good set of pipes. is 104.5hp atw ,good hp or have i been duded(not game to tell what it owes me)? im happy ish with that but bang for buck im not sure. please give me some light.