My 7-73 MPC shows P/N 6424827 Air Cleaner used on all 68 428 and 69 428 HO in full size cars. This number was also used on 68 Firebird and Tempest with 400 4 B.C., 69 Firebird with 400 4 B.C., and 69 Grandprix with 428. This should be the dual snorkel air cleaner. The only different P/N for 428 is the 1969 non HO used in big cars which is P/N 6485501. This number was also used on 69 400 GPs, 68 and 69 big cars with 400 4 B.C. and 68-69 Firebird and Tempest with 350 4 B.C. This should be the single snorkel air cleaner. Of course parts books are not always correct.
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