Three different camshafts

On Ebay they sell:
1.New  Norton Commando camshaft for engine with 90/270 degree crank
Engine fires at 270/450 degrees. Lift on cam IN 9.5mm, Ex 9.5mm

2.New  Norton Commando camshaft for engine with 90/270 degree crank
Engine fires at 90/630 degrees. Lift on cam IN 9.5mm, Ex 9.0mm

3.New  Norton Commando camshaft for engine with 90/270 degree crank
Engine fires at 270/450 degrees. Lift on cam IN 9.5mm, Ex 9.0mm

They are camshafts for early commando with tacho on the timing.

Well, i really dont understand what they are and the differences, but i would like to buy one for my stock 1968 engine.

Wich one?

Thank you.

Piero

pierodn said:

Well, i really dont understand what they are, but i would like to buy one for my stock 1968 engine.

Click to expand...

DON'T buy any of them, as they are not intended for use with a standard Commando 360 degree crankshaft, they are for use with offset cranks.

http://www.offsetcrank.com/norton.htm

These cams won't work on a stock engine.

They are for engines with a special crankshaft with crankpins at 90 degrees. The stock crankpins are at 360 degree.

Thank you Les and John.
Piero