Pontiacs Fiftieth Year

By 1976 the horsepower war was over and Detroit had lost. Pontiac marked its fiftieth anniversary with a black and gold Trans Am that looked far faster than it was, and then its engineers did something nobody else in the industry managed that decade: they made the numbers go back up. Read on to find out which two sets of cylinder heads they used to do it.

For most of Detroit, the second half of the 1970s reads as a slow surrender. Compression ratios fell, catalytic converters arrived, big-block engines quietly disappeared from order sheets, and cars that had been genuinely quick a few years earlier were reduced to selling stripes and decals. Pontiac played that game as well as anybody — the black-with-gold-highlights anniversary Trans Am that appeared on showroom floors in 1976 to commemorate the division’s fiftieth year is one of the most recognizable American cars ever built, and its visual promise ran well ahead of what was under the hood. What makes Pontiac’s version of the story different is what its engineers did in 1978, using nothing more exotic than a set of cylinder heads from a smaller engine.

Black, Gold, and a Fiftieth Birthday

The styling evolved quickly. The 1977 model wore a more slanted nose than the 1976, and from 1977 through 1981 every model carried four square headlights — the single fastest way to date a second-generation Firebird from across a parking lot. The engine order sheet developed a distinction that mattered enormously to anyone paying attention. The 1977 T/A 6.6-liter option, RPO W72, was rated at 200 horsepower and came with chrome valve covers. The base 6.6-liter, rated at 180 horsepower, had painted valve covers. Two identical-looking cars, twenty horsepower apart, and the giveaway was visible the moment you opened the hood.

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Four Square Headlights and the W72 Distinction

Pontiac also received an extraordinary amount of free advertising from Hollywood. The 1977 was the model used in Smokey and the Bandit, and the 1980 Turbo appeared in the sequel. It is difficult to overstate what that did for the Trans Am’s cultural position — the car became shorthand for a certain kind of American attitude in a decade when the actual performance figures could not have carried that reputation on their own. Decades later the association is still doing work; a black and gold Trans Am reads as fast to people who have never driven one and never looked at a spec sheet.

Hollywood Does the Advertising for Free

The regulatory environment forced some awkward compromises. From 1977, a 403-cubic-inch engine sourced from GM’s Oldsmobile division, with a fatter low-end torque band, became available for California sales and for high-altitude driving. Buyers in those markets were getting a Pontiac with another division’s engine, which was standard practice across GM by then and irritating to brand loyalists every time. The 400-cubic-inch Pontiac engine, meanwhile, was simply not an available option in California at all.

Borrowing an Oldsmobile Engine for California

Then came the fix. For 1978 Pontiac engineers reversed the horsepower decline by raising the compression ratio of the 400 engine — not with a new casting or an expensive redesign, but by bolting 350 heads with smaller combustion chambers, the 6X-4 heads, onto a 400 block. Smaller chamber volume on a larger bore raises compression, and compression makes power. The rating went to 220 horsepower, a ten percent increase, at a moment when essentially every other engine in America was going the other direction. That combination appeared on 1978 and 1979 Trans Am and Formula models equipped with the 400-cubic-inch engine and a four-speed transmission.

The 6X-4 Heads: How Pontiac Reversed the Decline

The 1979 Firebird celebrated its tenth anniversary with a special edition Trans Am, and Pontiac committed properly to it. The car came in silver lower paint with gray accents and a special Firebird hood decal that extended down the front fenders, with a silver and gray interior and silver-colored leather seats. Production was capped at 7,500 units. Of those, 1,817 carried the Pontiac 400-cubic-inch engine coupled to the Borg-Warner Super T10 four-speed — the specific combination collectors now hunt, and the one that gets a car looked at twice at any auction.

Ten Years On, and 7,500 Cars in Silver

There was a catch to that combination worth knowing before you buy one: cruise control was not available with the Borg-Warner T10. The final drive told the same story. Pontiac 400 cars came with a 3.23 gear ratio while the 403 Oldsmobile cars ran a 2.73, which is a meaningful difference in how the two feel from a standstill and a useful authentication check when a seller’s memory of the engine is vague. Engine size was the only option on these anniversary cars — everything else was decided for you — and once again, the 400 could not be ordered in California.

The Gear Ratio That Told You Which Engine You Had

Owners did what owners have always done. The high-performance Firebirds could be brought back up to pre-emission-control specifications by removing or disabling the pollution control equipment. Simply removing the plate under the hood covering the scoop made the non-functional hood scoop function. Block the exhaust gas recirculation system, remove the catalytic converter, and the car woke up considerably. Whether that was legal is not really in question; whether it was common is not either.

Undoing the Regulations in a Driveway

By 1980 the regulations had tightened further and Pontiac stopped offering big-block, large-displacement engines entirely. The standard engine across all models became the 301 cubic inch, available with a turbocharger option, with the largest alternative being a 305-cubic-inch small-block. That is a remarkable statement about how far the ground had shifted in four years. 1981 was the final year of the second-generation Firebird, carrying over the same engines with one consequential change: a new-style electronic carburetion system. The car’s cultural life outlasted its production by decades — singer Kesha liked her own gold Trans Am enough to write a song about it, tucking "Gold Trans Am" onto the deluxe edition of her second album Warrior and handing a fifty-year-old division’s anniversary car another free advertising run it never asked for.

301 Cubic Inches and the End of the Second Generation

For anyone shopping one of these cars now, the details above are the whole game. Chrome valve covers on a 1977 6.6-liter mean the W72 and 200 horsepower; painted covers mean 180. A 3.23 rear gear points to the Pontiac 400 while a 2.73 points to the Oldsmobile 403, and a car wearing a 400 badge with California history deserves close scrutiny since the engine was never offered there. On a 1979 tenth-anniversary car, the Borg-Warner Super T10 four-speed narrows the field to 1,817 of the 7,500 built — and the absence of cruise control is confirmation rather than a fault. Fifty years of decals and reproduction parts have blurred a lot of these lines, but the hardware still tells the truth if you know which parts to look at.

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