I want to build a more powerful engine from my 633ccm-engine, the way Abarth did it in the late 1950ies
for that result I do not want to use a different engine (770, 850, 903 etc), I really want to upgrade that small engine.
so I have some questions about the modifications that are possible:
First, I want to know, what intake and exhaust valves (valvole aspirazione e scarcio) can be fitted into that early head?
originally there are
car inlet / exhaust
600 24,5 / 22,5mm
600D 25,5 / 23,5mm
I read about a modification with 28/26mm valves in early heads? Can anyone tell me what would bei suitable? Probably parts from other Fiats will fit?
can anyone tell me, what sizes of valves ABARTH used in early 600-based-cars?
and, what is very important: where (or from what cars) do I get those bigger valves?