Originally Posted by Chris Peralta

Yeah see I think your problem is going to be the crank. That F11 crank is the same as a C6 crank. The crank is what alters the stroke between the F11 and B6 from the WS7 engines. The WS7 engines had a square stroke so having a long stroke engines crank pushing on a short stroke engines internals is going to have all of your timing out of wack and may push the piston too far up in the sleeve. C6/F11 = 16.80mm stroke the WS7 engines had a 16.42mm stroke. With these number differences the ports are probably placed slightly different on the WS7 sleeve vs the F11.

And yes the sleeve is a 7 port like the F11 but the F11 sleeve has a bore 16.22mm and the bore of the WS7 was 16.42 .... anything is possible but those are two totally different engines and it could be risky.