P11 engine build

I am looking to build up a P11 engine, I have crankcases and crankshaft.
So question, a P11 engine is basically a 750 Atlas engine so will things like barrels, rods, cylinder head etc from a 750 Commando work with these crankcases ?
Thanks Richard

tribonnie said:

I am looking to build up a P11 engine, I have crankcases and crankshaft.
So question, a P11 engine is basically a 750 Atlas engine so will things like barrels, rods, cylinder head etc from a 750 Commando work with these crankcases ?
Thanks Richard

Click to expand...

Yes it can all work if the barrels and cylinder head are both for a Commando 750. A Commando 750 head will fit on P11 barrels, but the P11 barrels need to be drilled and tapped for 3/8-26 bolts in 5 locations. Rods, pistons, and ect are or can be the same. Although the Commando pistons will be flat top and slightly higher compression than the dished pistons P11 used originally. The cam has to be for a pre-commando in P11 cases, unless some additional modifications are made to the timing side case to support a Commando cam and ignition in a Commando timing cover. I might be wrong about the thread count on the 3/8" head bolts, but a stock P11 had 5/16" bolts in the 5 locations.

Shorter answer is... Yes I've done it. Go for it.

In addition to the above, might be prudent to point out the rocker oil feed positions are different, but obviously not insurmountable, but would check that the P11 head steady can be fitted to the Commando head?
Again, I defer to yer man above to elaborate