The idea of installing a powerful engine in a post WWII mid-size car was introduced in 1957. The American Motors (AMC) Rebel showcased AMC?s new 327 in³ V8 255 hp with a 4 barrel carburetor (fuel injection was to be optional), thus making it the first American factory hot-rod hardtop sedan. The Rambler Rebel came with a manual or automatic transmission, and dual exhaust. The Rebel was promoted as the fastest four-door car in America from 0-60 mph and ran the quarter mile in 17.0 seconds. It was one of the quickest production automobiles at that time.

The popularity of the muscle car grew in the 1960s. Among these was the Pontiac Tempest. For 1964 and 1965, the GTO was an option package that included Pontiac's 389 in³ (6.5 L) V8 engine, floor-shifted transmission with Hurst shift linkage, and special trim. In 1966, the Pontiac GTO was no longer an option, and became its own model. The project, spearheaded by Pontiac division president John De Lorean, was technically a violation of General Motors policy limiting its smaller cars to 330 in³ (5.4 L) displacement, but it proved far more popular than expected, and inspired a host of imitations, both at GM and its competitors.

This marked a general trend towards factory performance, which reflected the importance of the youth market. A key appeal of the muscle cars was that they offered the burgeoning American car culture an array of relatively affordable vehicles with strong street performance that could also be used for racing. The affordability aspect was quickly compromised by increases in size, optional equipment, and plushness, forcing the addition of more and more powerful engines just to keep pace with performance. A backlash against this cost and weight growth led in 1967 and 1968 to a secondary trend of "budget muscle" in the form of the Plymouth Road Runner, Dodge Super Bee, and other stripped, lower-cost variants.

Although the sales of true muscle cars were relatively modest by total Detroit standards, they had considerable value in publicity and bragging rights, serving to bring young buyers into showrooms. Automakers saw these as halo models and some, such as the AMC Rebel Machine, were factory upgraded to be turn-key drag racers. The 1970 Machine even came with flamboyant and patriotic red, white, and blue reflective body graphics for maximum street and racetrack visibility. The fierce competition led to an escalation in power that peaked in 1970, with some models offering as much as 450 hp (and others likely producing as much actual power, whatever their rating).

The Dodge Charger, known for its appearance as the villan's vehicle in the movie BullittAnother related type of car is the car-based pickup. Examples of these are the Ford Ranchero, GMC Sprint, GMC Caballero, and one of the most famous examples, the Chevrolet El Camino.

The Death Of The Muscle Car - My First Case
Warren Newson
1091

How could muscle cars, the most powerful affordable cars the world had seen, lose their oomph so quickly? What caused them to disappear? I'm not a private eye, not remotely like one, but this was one case I had to solve.

It happened back in the 70's, but the evidence was still there. It was the case of the disappearing horsepower and this is what happened.

In the era of the muscle car power was everything. It didn't matter what it was, sports car, family car, pickup; it had the biggest V-8 possible stuffed under the hood. Cubic inches were king and advertised power was astronomical. These cars could kick sand in the windscreens of anything else on the road.

But then horsepower seemed to disappear overnight!

Take my favourite muscle car, the Ford Mustang. The macho models had V-8s, though meeker models came with an inline six. The biggest six had 200 cubic inches and 155 hp in 1969/70.

What did the V-8s punch out? The most powerful 351 gave 300 hp in 1970 and the 427 gave a massive 390 hp in 1968. But by 1973 the most powerful Mustang had a 351 V-8 with just 156 hp. Almost half what it had in 1970, and only one horsepower more than the 200 cu in six of 1970! As for the Mustang II of 1974, we won't even go there.

The story was similar with the other manufacturers. What was going on? It just didn't add up. Could I trust the figures?

My detective mentor, Agatha Christie, taught me that when you're solving a case you can't trust anyone. Murderers do lie. In this case it wasn't murder though it was the death of the muscle car, and it wasn't so much of an outright lie as not telling the whole truth. And outside forces were at play.

I had to dig deeper. I had to find the facts. Why would horsepower virtually halve?

It turned out there were a few reasons. Salesmanship was one. Horsepower was everything so why not measure it in a salesman friendly way? Gross SAE horsepower was used. Power was measured at the flywheel with no power-hungry accessories attached. Only the bare essentials were used.

In 1972 SAE Net measurements were phased in. Power was still measured at the flywheel but all the accessories were installed including the full exhaust system, emission controls, all pumps and the alternator. SAE Net can't be compared exactly to SAE Gross because there are just too many variations in measuring, but it is down around 80%. So power ratings dropped. In 1973 horsepower ratings went down again as power sapping emission controls were tightened.

Gross SAE horsepower had pushed the listed power up. So did the advertised horsepower some car companies used. What's wrong with a little rounding up of the numbers for the brochure? Surely that would help sales too.

All this horsepower galloping around got noticed and not just by young guys.

Safety legislators noticed, and so did insurance companies who started charging more for insurance. The word on the street is that in 1967 a young guy under 25 with a clean driving record would have paid $700 a year for GTO coverage. Ouch! Some car companies lowered their advertised horsepower ratings.

Muscles peaked in 1970, and by 1971 they were starting to get flabbier. Engines were being detuned and within another year bigger engines were being dropped.

In 1973 many muscle cars were a shadow of their former selves. And they were finished off by the oil crisis of late '73. Long lines at gas stations and soaring prices were a real shock, and so was a 55 mph national speed limit. Gas guzzlers were irresponsible, expensive and unwanted, it didn't matter how much fun they were.

So there you have it. I now knew what had happened to all that brute power. Some exaggeration had pushed listed horsepower up. A fairer, more accurate measuring system brought it down. Emission controls brought it down more, and soaring insurance costs made ground-thumping power too expensive to own. The oil crisis finished the muscle car off. This case was solved.

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