Spike

There is a pair on ebay at the moment

http://www.ebay.co.uk/itm/VAUXHALL-FIRENZA-MAGNUM-VIVA-HC-2300-2-3-CF-OHC-ENGINE-TWIN-STROMBURG-CARBURETOR-/291513398195?pt=LH_DefaultDomain_3&hash=item43df8d73b3

Mine is on 1 3/4" SUs and runs a lot better than it did on Strombergs, and they are easier to look after, I'll have a look and see what I have tomorrow

Davidr