When did the 170 engine get the 5/16" oil pump shaft?

wsa111

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When did the 170 engine get the 5/16" oil pump shaft?. Early 64 or was it phased in at a certain production date????
 
all Falcon's didn't change at once ('64 & below)?
I thought if U went '65 U were 'all set'…
(?more of 'the empty box' method, even 4 blocks?)
 
it was a running change in 1964. the early 64s had the 1/4" the later ones had the 5/16" shafts. i have an early one. as to when the changes over began, i a not sure, i dont think even ford is sure.
 
(?more of 'the empty box' method, even 4 blocks?)…
guess so. Kinda consistent then, eh?
 
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