350 and 450 head the same?

[LexH]

Does anyone know if the 350 and 450 desmo heads are the same (interchangeable)? I would have thought not, given the difference in bore size. And my parts catalogue gives different part numbers for the respective castings. But I've heard some say they're interchangeable.

[LexH]

Doh! Just realised I have both a 350 head and a 450 barrel lying around in my workshop. Nope, a 350 head will certainly will not fit on a 450 barrel. Answered my own question.....

[Jordan]

As well as other details, positions for the head/cylinder bolts are different between 450 and 250/350.
The head castings of later model 250/350 singles were shared with 450 though, just machined and drilled to suit either type.
The bosses for the bolts are oval, rather than round as on early models.