Interesting info. No wonder the pin thing never made sense to me as my 1956 261 doesn't even have that boss. It looks like in Tom's case the boss was added but not machined for the pin. My pic showed the smallest Amsoil bypass filter available and probably won't fit there in a car. Other options are mounting to the intake like
this or use a small spin on
shown here. IMO hoses are an invitation for trouble.
Curt B.
