hemi was a new head design which made the top of the chamber put a intake and seperate exhaust valves at the top and they had a tendancy to create a vacuum effect with the opening of ports that increased the horsepower, (thats why the engine is rated at 425+ hp instead of a set number) at the time i belive there were only the flathead one valve per cylinder and the OHV engines out b4 the hemi
Trace Evidence Reviewed by Trace Evidence on . Your dream car .. I love the 66 emberglo convertible, im gonna get one when ive saved up enough pennies. So stoners whats your dream ride ? Rating: 5