256 vs.447 difference

[littlebill31]

Hey all,
I've built a couple 447's and have my first 256 to rebuild. Just wondering if the only real difference is the pistons, connecting rods, and cam chain? And what else should I look for in the internals? (Not including the ignition/charging/starter.)
I want to rebuild it to 447 spec, but it is a numbers matching bike, so I'm not going to just switch the engine.
Thanks all

 

[5twins]

Cam chain sprockets on the crank and cam are different sizes compared the the 447 motor, hence the different length chain. A 447 cam can be used if you change the sprocket.

 

[cros36]

dont some consider the earlier cams better for performance due to the longer duration?
if i remember this right it might be something to consider keeping in your 256 engine.

 

[littlebill31]

Thanks 5twins.