P11 Cylinder barrells

Hi,
Can anyone tell me if the P11 Barrells are the same as the 750 commando barrells?
With Thanks
Reg Ellis

P11 cylinders

The P11 cylinders are the same as Atlas 750 (p/n 25323). There are some minor differences from Commando cylinders (p/n 060396). I believe the 750 Commando cylinder will fit to the Atlas crankcase.

Thanks david,
But will the atlas cylinders bolt up to a commando crankcase?
They have the same casting number, bore, & stroke mounting holes.

With thanks
Reg Ellis
http://users.bigpond.net.au/nortonfan/

P11/Atlas cylinders have 5/16 cylinder head bolt holes where Commando cylinders have 3/8. It's a simple matter to drill and tap (3/8-26) a P11/Atlas cylinder for a Commando head or drill the P11/Atlas head for the 3/8 bolts for the Commando cylinder.

The crankcases are the same, so either cylinder readily bolts to either crankcase.

Ron

Thank you Ron, that is what I wanted to hear.