The NASCAR Homologation Loophole That Put 405-HP Big Blocks In Police Fleets
NASCAR is a multi-billion-dollar motorsports industry these days, but it comes from humble beginnings. NASCAR has its roots in bootlegging, with some drivers honing their skills as whiskey trippers. In 1947, NASCAR—the National Association for Stock Car Auto Racing—was conceived, with the first race run a year later at Daytona Beach. In its infancy, NASCAR saw cars driven straight off the road and onto racetracks, but by the ’60s all that was starting to change. With the sport going mainstream, the big carmakers wanted a piece of the action, and they would work the rules in every way possible to get an edge on the competition.
The Early ’60s Saw A NASCAR Homologation Arms Race Between Ford, Chevy, Pontiac, and Mopar
The word “homologation” conjures up images of the most exciting rally and track cars the world has ever seen. Perhaps most famously, Group B rally cars were loosely converted for road use during the infamous Group B era, with tiny numbers of exotic machines created to satisfy rules for racing. But while the FIA is famous for homologation rules (and the regulations being famously twisted), the same happened in NASCAR in the early ’60s.
True to the original ethos of NASCAR, carmakers could still only race cars that had a production run of 500 or more. Or to put it another way, companies had to build 500 road versions to make the race car eligible to race. Essentially, they turned their production cars into race cars, and then made production versions of the wild results. Often, most people wouldn’t know these hot rod creations were even available in showrooms, but they were.
Ford’s 406 cubic inch FE V8 Was A NASCAR And NHRA Homologation Stopgap
For 1961, Ford had a winner on its hands in the shape of its 390 ci V8. The engine was a strong performer in NASCAR and Tri-Power street versions had a healthy 375 horsepower under your right foot. Nobody needed more than that. Right? But customers soon started turning to the larger (and often more powerful) offerings from the competition, namely Pontiac’s 421, the Chevrolet 409, and the Mopar 413. The truth was, Ford was the only manufacturer without a mill more than 400 ci in early 1962.
Ford needed an answer fast, so quickly introduced the 406-ci (6.6-liter) homologation special. This motor was basically a bored-out version of the 390, enabling the company to have a 400-plus motor in its showrooms without huge redevelopment costs. There was nothing last minute about how it performed though. This was a rare and interesting option that deserved respect.
The 406 Was A Sleeper For Those In The Know
The 406 was offered in full-size Ford and Mercury models. There were a few things that buyers had to get with the 406, however. Ford Galaxies with this motor needed standard heavy-duty suspension, a Borg-Warner T10 four-speed transmission, beefier driveshaft, four-wheel drum brakes, bigger wheels, and a few other extras. Power steering was not available with the 406. It made sense to have these upgrades, as the 406 was quick for the time. Tri-Power 406s could hit 60 mph in 7.1 seconds, and a 406-equipped Galaxie when tested posted a quarter-mile time of 15.6 seconds at 92 mph. As stopgaps went, the 406 sure packed a solid punch.
The Police Could Now Keep Up With The Bad Guys
Interestingly, the 406 was never officially advertised as a police package option, but that didn’t mean it was out of bounds to law enforcement. Special fleet orders allowed police departments such as the Connecticut State Police to reportedly special-order these race-bred engines for unmarked or patrol use. A very interesting article at Brucehotchkiss.net tells the story of an ex-Connecticut State Police unmarked pursuit car that Bruce always thought had a 390, but this turned out to (perhaps) be something a little more.
Everything was upgraded on the car, and years after selling it, Bruce concluded that it must have been a 406 due to cross-bolted main bearings. A chat with Ford Motor Company Archives seems to confirm that the car may have been a police special build. If true, this would have been peak police off-menu ordering during an era when everyone was working the rules to get the fastest machine possible.
The 406 Came In Two Different Forms
The engine was a bored-out 390 with 11.4:1 compression and cast headers, and was offered in four-barrel guise, as well as a Tri-Power version. It would only be offered for two years before the Blue Oval introduced the 427 of 1963. Both variants featured 11.4:1 compression, cast headers, and a low-restriction dual exhaust. Each cylinder bore increased by .080-inch to 4.13-inches, with the 3.784-inch stroke of the 390 exactly the same. Ford upgraded the pistons and connecting rods, as well as added cast-iron exhaust headers and a 2.50-inch dual exhaust set-up.
The standard 406 had a rating of a healthy 385 hp at 5,800 rpm with 444 lb-ft of torque at 3,400 rpm. The more powerful G-Code version had three Holley two-barrel carburetors on an aluminum intake. The Tri-Power 406 boasted 405 hp at 5,800 rpm and 448 lb-ft of torque at 3,500 rpm. This puts it pretty close to some of the most powerful muscle cars of the ’60s from any of the Big Three.
The 406 Is A Cheap Muscle Car Alternative
Of course, the 406-powered Fords of the early ’60s predate the muscle car revolution, but they are natural predecessors. The Pontiac GTO was the first car to get that title, and kick the whole genre off, but a Tri-Power Ford Galaxie from 1962 is, for all intents and purposes, a muscle car, just in supersize form. It’s hard to find official production numbers, but some forums say that 8,384 Fords left the factory in 1962 with the 406 V8.
It goes without saying that if you break that down to specific models with the 406, you will have a pretty rare car on your hands. With the rarer ’60s muscle cars (from 1964 onwards) now changing hands for a lot of money, the 406 Fords represent an affordable blend of low production numbers and output figures up there with some of the most potent golden era muscle cars. The fact that cars like the 1962 Galaxie seem to perfectly bridge the jukebox aesthetics of the ’50s and the more austere look of the mid-’60s muscle cars is an added bonus.
Here’s What To Pay For A 406-Engined Ford From The Early ’60s
There are plenty of 406 options to choose from on the used market. A Galaxie 500 with this engine sells for just $9,900, while a Galaxie 500 XL Sunliner drop-top will set you back $55,800, says Hagerty. For cheap-as-chips 406 ownership, a 385-hp four-door Town Sedan will cost just $6,800. Yes, they aren’t bona fide muscle cars, and “Town Sedan” doesn’t quite roll off the tongue like GTO, but considering the interesting history of the 406, this could be one of the classic bargains of 2026.
Sources: Hagerty, Bruce Hotchkiss, Ford
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