340 or 408?

justinp61 said
Define a tractor engine? My 434 has turned 7800. Tractor engine?

Stroked, tiny bore, under headed and under cammed and done at 5000 rpm, loads of torque little horsepower.
Your 434 is a classic example of a well thought out engine, those Indy heads will make some real power far above a tractor stroker.