Jean Fouche wrote:

The 12A housing with 3 exhaust ports belonged to the Mazda Rx-2 twin
distributor engine 1971 to 1973. This engine is similar to the 10A used in
the Mazda Rx-3 in Japan.

The three exhaust ports were created in an effort to save the 6mm carbon
from distorting and breaking at high revs. The twin dizzy 12A engine will
out-perform a stock 13B on acceleration. From a durability point of view,
the 13B wins hands down.

Jean Fouche

 
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