Steel versus Aluminum manifolds

["de Brebisson, Cyrille (Calculator Division)" <cyrille@hp.com>]

Hello,

I need to make a new manifold for my fuell injected Midget...

I have 2 choices... modify a Stromberg manifold or create a new one...

To use the Stromberg, I just need to create the 'holes' for the
injectors, but they have really restricted flow...

I could make a new manifold, but as I can not weld aluminum, I would do
it out of stainless steel...

Does anyone knows any good reason why I should use aluminum over steel?
And why aluminum is better?

Regards, cyrille