Quote:

I'm in agreement with you that they were originally to fit on a Bonneville.
I did have to shoe horn these in delicately.
They are higher and longer.
Higher makes a more straight in shot for the fuel to reach it's destination.
Longer? I believe length adds earlier torque increases.

Tweaking the angle would need to be done by a machinist cause of the O-ring groove you would be removing to change the angle would have to be milled in again.
Length would be easier but ya still have to have the O-ring groove milled back in.



i have some of the longer thruxton manifolds and they still fit (the rubber couplings are inverted though).

the angle is probably the critical feature. I would think that would be easiest to change with the least impact on length. If you could determine exactly what that angle is of course.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter