Hey all,
This is a mystery that's been hanging over my head (pun somewhat intended, unfortunately) for years now and the head ID article in the latest Norton News has pushed me over the edge. My head has a casting number of 06-0380 which I have yet to see mentioned in any article I've read about these things. The closest I've seen is a part# of 06-0379 which corresponds to an RH1 head. It also has a 4 (not RH4) stamped into the top, and an "A" cast into the bottom along with "Wells" carved into the bottom which I assume to be the name of someone who worked on it at some point. See pics below:
I was wondering if anyone could help me get a little more detail as to what head I have in terms of compression ratio and such. Unfortunately it's back together and running leak-free, so all I have are these pictures and whatever I can see when it's installed, and I'm loathe to touch anything to make it start leaking again!
I have a gut feeling it's an RH1, but my bike is a 73 750 - was it normal to have early heads on later bikes?
This is a mystery that's been hanging over my head (pun somewhat intended, unfortunately) for years now and the head ID article in the latest Norton News has pushed me over the edge. My head has a casting number of 06-0380 which I have yet to see mentioned in any article I've read about these things. The closest I've seen is a part# of 06-0379 which corresponds to an RH1 head. It also has a 4 (not RH4) stamped into the top, and an "A" cast into the bottom along with "Wells" carved into the bottom which I assume to be the name of someone who worked on it at some point. See pics below:
I was wondering if anyone could help me get a little more detail as to what head I have in terms of compression ratio and such. Unfortunately it's back together and running leak-free, so all I have are these pictures and whatever I can see when it's installed, and I'm loathe to touch anything to make it start leaking again!
I have a gut feeling it's an RH1, but my bike is a 73 750 - was it normal to have early heads on later bikes?