In & Ex valve length compared to Commando

jseng1

Joined

Nov 26, 2009

Messages

3,381

• Oct 16, 2025

• #1

Does anyone have the actual In & Ex valve length of Atlas Compared to Commando? Are the Domni valves the same length as Atlas? And what about the pushrods.

 

possm

Joined

Jul 3, 2009

Messages

965

• Oct 16, 2025

• #2

According to the Roy Bacon "Norton Twin Restoration" at engine number 125871 the valves were made 0.1 inch longer and push rods shortened by 0.1".

 

jseng1

Joined

Nov 26, 2009

Messages

3,381

• Oct 17, 2025

• #3

possm said:

According to the Roy Bacon "Norton Twin Restoration" at engine number 125871 the valves were made 0.1 inch longer and push rods shortened by 0.1".

Click to expand...

Is that both intake and exhaust?

 

possm

Joined

Jul 3, 2009

Messages

965

• Oct 17, 2025

• #4

Yes

 

M

mdt-son

VIP MEMBER

Joined

Jan 19, 2012

Messages

2,468

• Oct 18, 2025

• #5

Look at the pdf for pushrod lengths in this thread:

Pushrod length | Norton Owners Club

www.nortonownersclub.org

- Knut