Join Date: Nov 2003
Location: Port Elizabeth, South Africa
To fit a 105 Series 1300 + twin Webers into a '57 Normale & still keep the tunnel case you will need original 750 Veloce engine mountings to tilt the engine over 8*20' to provide clearance for the Webers over the inner wing.
Then of course the exhaust will need to be changed and the throttle linkages and the Lucas starter will most likely foul on the new throttle linkage and the list goes on - the law of unintended consequences.
I hear you on twin Webers, however as you still have the 4.55 (9/41) rear axle all you will really gain is a fast pull away and quicker throttle response. You could gain 95% of the above with a 1400 piston kit and a single downdraft Weber in place of the original Solex. Keep the original engine mountings, make an adapter for the top of the Weber and fit the original air filter can & use the '58 onwards 4-into-2 exhaust manifold with no fitment issues.
My Dad has a '57 Spider with a 105 engine & single Weber downdraft, albeit with a 5 speed (I bought it like this & have a '57 Spider motor & tunnel case on the shelf). Reed has driven this car about 2500 miles on two different SA Giulietta Tours and can vouch that it pulls almost as well as his '58 Spider Veloce despite only being a 1300.
I have three '57 Sprints & a '58 Sprint Veloce Confortevole so understand the early flat transmission tunnel sheet metal issue and why you want to stick with the tunnel box
I've sent you a Private Message as well
Last edited by AlfistiSA; 09-22-2019 at 03:44 AM.