R27 cylinder head on R26

[Bob Allan]

Is it possible to fit an R27 cylinder head to an R26 using standard R27 mounting parts? I may have to consider this, & if so I'd try to use standard components to rubber mount the head.

[Rodolfo850]

No problem, you can fit without any issue.

Only difference between are that R27 has 02 studs on backside for upper mount.

[Bob Allan]

Hi Rodolfo, thanks for the reply.
I'm trying to find out whether the R27 mounting parts for the head will fit the R26 frame.

[jwonder]

Bob,

The upper mount is mounted on the frame to the “fuel tank carrier” plate. I believe the placement on the fuel tank mounts are quite close between the R 26 and R 27. I am fairly sure you could use the top mount. You may need to modify the top bracket, but there is quite a lot of slop in the bracket anyway so I would envision it working. Without ever doing it I would say there is a great chance it would work as is.

[Rodolfo850]

Since R26 doesn't use upper mount, you can install the same way.

Remove both studs and leave same way as R26 is.

I have done inverted process several times, have installed R26 heads on R27 after weld a base plate for this studs.

[Bob Allan]

Rodolfo & James
Thanks again for the replies.
The reason for my enquiry is that my only R26 head has failed, with the plug insert blowing out & a triangular damaged spot in the combustion chamber around the insert & valves. I'm hoping this can be repaired, but if not there's an R27 head casting spare that I may have to fit. And if I fit it I may as well try to utilise the rubber mounting system on the head.
Happy New Year to you both.
Bob