Mounting 40mm carbs on Le Mans

[Simon_London]

Can I mount 40mm Dellortos on the standard inlet rubbers for Mk 1/2 2 Le Mans 36mm manifolds / rubbers ?

Will this mod work?

Or do the heads need to be ported to accept 40mm manifolds and rubbers?

Will I need to change the slide?

Thanks

Simon

[NCAmother]

I don't know about using the original rubber mounts, I've never used them.  I have Keihin 41mm, with fuel resistant hose to 'stock' intake manifolds. The intake manifolds and heads have been heavily ported and gasket matched.  Doing all the port work , as well as the 'built' motor, required bigger carbs to maximize optimum power/torque.  Is your motor stock?  If so, you should probably stick to the original carb size.

[pressureangle]

No, and you don't want 40's on it either. Even on the LM IV, the 40's are cranky and need a light touch below 3500 rpm. On a smaller engine with less compression you'd regret the effort.