t ingermanson
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- Joined
- Oct 17, 2018
- Messages
- 609

Anyone know if the radius on the SS head's combustion chamber is constant, and if so, what the radius might be?
Hi not sure, but I think it would be a constant radius in that era for a Norton, Jim S has some drawings he may be able to confirm?Anyone know if the radius on the SS head's combustion chamber is constant, and if so, what the radius might be?
When I got the head, it had a cubic-ish lump of steel wedged under the intake valve. Matches the shape and size of the divots in the head, so I reckon that's what was bouncing around.Good Luck-I have an 850 head that got beat up something fierce. it's shown on my web site...I will try a big valve conversion to use on a 74 bottom end. I have two sets of 1.650 intakes and seats. I'll try it with a 920 kit that has been on the shelf for ages...
The head has already been welded up and my friend ran a ball end mill on his CNC to clean it back up to a sphere.
A bit off topic but I also have a cracked RH4 I am going to try a 1"(or more) aluminum plug to put a new 1/2" guide in for a fix.