pierodn said:
Hi.
But my Atlas has short one 13,5 mm long.
Maybe the long 26 mm are for 650 SS?.
Thank you.
Piero
My 1963 Atlas has the long 26 mm manifolds. Considering that the long manifolds made it near impossible to service the Atlas air cleaner, I always wondered why Norton did not use the shorter manifolds to gain a little more room.
Servicing the air cleaner, and the fact that it seemed to remove only large matter from the air, made me abandon it and use velocity stacks only.
I have no data, but the longer manifolds may improve mid-range torque.
Slick