The parts book for late B20 in the 140 lists 7 different heads coving carbs and F.I. Interestingly they all list the same part for the inlet valves. Exhaust valves are listed for the carb models B20A/B and another part number for injection models. Pick the bones out of this. That took a while!
B20 Early 140
In #419639 B20 A/B/D
In #419760 B20E/F
Ex #419640 B20 A/B/D
Ex #419735 B20 E/F
B20 Late 140
In #419639 B20B
In #419766 B20 E/F
Ex #419640 B20B
Ex #419735 B20 E/F
All Carb heads after the introduction of F.I. had the blank pad for the Injectors. Numbers above indicate that both early and late carb heads used the same small valves in both positions. Later F.I. engines got the larger inlet valves.
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