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My 65 built 440 runs just 2 breathers.My kids 62 300 413 with 50K OE miles runs 2 also.Neither has any problems with pressure or oil film.Mine runs an M1 intake with Dominator and has no provisions for vacuum.When we put the headers on the 300 it eliminated the draft tube.Both have run like that for over 10 years.Rocky

same here on my 496,if i beat on it real hard i will get a little oil seepage from the dipstick.