Identifying cylinder

[Bodylad]

I bought a legitimate stolen recovered engine from a police auction place, from a KTM LC2, some unscrupulous bastard has ground off my engine number, but also the numbers from the bottom of the barrel.
I have a 3BN cylinder head.
Which barrel am I likely to have ?
Which barrel is the best for power ? Don’t care for reliability I want power.

Mike

[Calum]

It'll be a 3MB cylinder. You want the 3MB head to go with it. 3BN heads are restrictive.