Pontiac Firebird 1968 – 400 Convertible with H/O and RA components

A 1968 Pontiac Firebird ordered with the right boxes checked could carry the 400 H.O. package or the mid-year Ram Air II update, complete with round-port heads and a reworked camshaft most buyers never knew existed. Out of over 107,000 Firebirds built that year, only 16,960 were convertibles, making a documented Ram Air drop-top a genuine rarity. Read on to find out what actually separated a standard 400 from Pontiac’s best-kept 1968 secret.

Order the wrong box on a 1968 Firebird build sheet and you got a 400 that merely sounded fast. Check the right ones, and Pontiac quietly built you something with a mid-year engine update most buyers never even knew existed. The H.O. and Ram Air designations on this era of 400-cubic-inch Firebirds weren’t marketing fluff — they represented genuinely different internals, different cylinder heads, and in one case, a completely different camshaft that arrived on dealer lots partway through the model year without much fanfare. Only a fraction of the 107,000-plus Firebirds sold that year left the factory as convertibles, and fewer still carried the full Ram Air hardware this one apparently has. What actually changed under the hood between a standard 400 and a 400 H.O. — and why does it matter so much to collectors now?

H.O. Wasn’t Just a Badge

The 400 H.O. added roughly $350 over the base 400 and got there with free-flow exhaust and, when paired with the four-speed manual, its own revised camshaft profile. It was rated at 335 horsepower and carried a higher redline than the standard 400, though it still sat a notch below the top Ram Air package. All 400-cubic-inch Firebirds ran a single four-barrel carburetor and could be had with a three- or four-speed manual or an optional three-speed automatic — though the four-speed was mandatory on any car ordered with Ram Air.

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The Mid-Year Update Most Buyers Missed

Pontiac introduced the Ram Air II package in April 1968, roughly halfway through the model year, replacing the original 335-horsepower Ram Air engine with a 340-horsepower version built around new round-port cylinder heads for better breathing, a higher-lift cam, forged pistons, an Armasteel crankshaft, and dual high-rate valve springs. A properly equipped Ram Air II convertible with the four-speed could reportedly run 0-60 in about six seconds and cover the quarter mile in the high 13s at right around 100 mph — genuinely quick numbers for a drop-top pony car built before radials were standard equipment on American performance cars.

The Numbers That Make a Ram Air Drop-Top Rare

With total Firebird production climbing roughly 30 percent to 107,112 units that year, and only 16,960 of those built as convertibles, a documented H.O. or Ram Air drop-top is a rare combination even by muscle car standards.

How the Firebird’s 400 Options Stacked Up Against the GTO

Pontiac shared much of its engine lineup across divisions that model year, and the same basic 400-cubic-inch architecture underpinning the Firebird’s H.O. and Ram Air options also powered the GTO, Pontiac’s more established performance flagship. That shared foundation meant a well-optioned Firebird could match or approach GTO-level performance numbers while wearing a body style still finding its footing in only its second model year on the market.

Why the Ram Air Name Meant Something Specific

Pontiac’s Ram Air branding referred to functional hood scoops that fed outside air directly into the carburetor rather than the warmer air trapped under the hood, a genuine performance advantage rather than a cosmetic hood treatment. Choosing a Ram Air-equipped 400 over the standard four-barrel car wasn’t just a horsepower upgrade — it changed how the engine breathed under hard acceleration in a way the H.O. package’s exhaust and cam changes alone didn’t fully replicate.

A Convertible Body Built for Comfort, Not Weight Savings

Convertible construction in this era typically meant additional structural reinforcement to compensate for the lost rigidity of a fixed roof, adding weight that a hardtop or coupe of the same specification didn’t carry. That extra mass makes a quick convertible more impressive than the identical drivetrain in a lighter coupe body, since every one of those Ram Air II performance numbers had to overcome a heavier chassis to get there.

The Mid-Year Split That Confuses Buyers Today

Because Pontiac introduced the Ram Air II package partway through the 1968 model year, cars built before and after April carry genuinely different hardware under otherwise identical badging, which is exactly the kind of detail that makes documentation essential for anyone trying to verify a specific car’s original specification decades later. A casual buyer glancing at a Ram Air callout on the hood has no way to know, without paperwork, which side of that April changeover a given car actually falls on.

Why So Few Ram Air Convertibles Survive

Convertibles already made up a shrinking share of the muscle car market by 1968, and layering a low-volume, mid-year performance option like Ram Air II on top of that already-small convertible population leaves a genuinely scarce combination. That scarcity is compounded by the reality that performance convertibles from this era were often driven hard and modified over the decades, meaning a documented, unmodified example carries weight with collectors well beyond what raw production numbers alone would suggest.

Documentation Beyond the Trim Tag

Because Pontiac used the same basic 400-cubic-inch block across several trim levels and option packages that year, a trim tag alone can’t confirm whether a given Firebird left the factory with the H.O. cam, the standard Ram Air I induction, or the later Ram Air II hardware — that level of detail lives in the original invoice, third-party documentation services, and sometimes stamped codes on the block itself. For a car built in the tens of thousands overall but genuinely rare in Ram Air convertible form, that paperwork trail is often what separates a documented example commanding real collector attention from a visually similar car nobody can fully verify, since a swapped intake or a repainted engine bay can make a base 400 look the part without ever having carried the real hardware.

A Second-Year Firebird Finding Its Performance Identity

Only two years into its life in 1968, the Firebird was still establishing itself as a legitimate performance nameplate distinct from its Camaro sibling, and options like the H.O. and Ram Air II packages were a big part of how Pontiac made that case to buyers cross-shopping against Chevrolet and Ford.

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