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Home / Magazine / #400 HO

#400 HO

Close-up of a 1968 Pontiac Firebird 400 HO functional Ram Air hood scoop and induction hardware

The Firebird 400 HO: Pontiac's Practical High-Output Muscle Engine

Mike Sullivan · Mar 11, 2026 · 6 min

Close-up of a 1967 Pontiac Firebird 400 Ram Air hood scoop duct and air cleaner seal under a raised hood

Ram Air I and the HO 400

Wayne Coburn · Jan 24, 2026 · 6 min

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