Open meant a breather on the valve cover rather than a tube linking the valve cover to the air cleaner like all 68 and up cars.
My understanding is that the smog pump (called A.I.R.) and the closed crankcase vent were mandatory on California cars but the closed vent was also a stand alone option on 49 state cars.
The HD filter air cleaners were identical to the non HD version other than the different filter element and the info stenciled on the housing.
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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