Re Spits missing at speed

[Bob Edgar <bob@bobe.demon.co.uk>]

This sounds to me like fuel evapouration.   As the float chambers are 
so close to the exhaust manifold, this is a common problem with 
Spits.

The piece of card (heat deflector) mounted between the inlet manifold 
and the carbs usually disintegrates as the years go by, and leaves 
the float chambers unprotected.

I am, of course, referring to the UK set up of twin SUs.   Whether 
the same is true for the single Stromburg and all the anti-smog 
devices the North American models have on them I don't know.

Worth investigating anyway.

Bob Edgar
Spit 78 14000-miles-a-year driver!