Off with its head

[stevey]

I've run into some trouble with the cylinder head on my series 2. I can get hold of a 948 head but will a 948 head fit the 803 block?

Many thanks

[myoldjalopy]

Happy to be corrected, but I say 'yes'.....I think the 948 and 803 heads are pretty much the same.

[philthehill]

The 803cc and 948cc cylinder heads are of the same specification.
They can have casting numbers - 2A628, 2A629 or 12A1456.
All the heads have a combustion chamber of 24.5cc.

[stevey]

Brilliant thank you, I'll have the old machine up and running again soon! I'll keep you posted.

[JOWETTJAVELIN]

Oh dear, what happened there?

[stevey]

I'm assuming that the valve hasn't been shutting right and has burned the valve seat.

[stevey]

Valve looked OK just the head unfortunately.

[stevey]

New head fitted and all. Compression test shows only 5 psi difference so looking good. The replacement head has new valve guides so was able to use the later spring type valve stem oil seals. Thanks for the info guys.