Ford 5.0 V8-Swapped 1992 Mazda MX-5 Miata Surfaces on Cars & Bids at No Reserve

A 1992 Mazda MX-5 Miata that has traded its factory 1.6-liter four-cylinder for a carbureted Ford 5.0-liter V8 is currently up for grabs at no reserve on Cars & Bids, where a single bid has the price at $1,992 with six days left on the clock. Finished in blue over a black interior with a matching removable hardtop, this NA-generation roadster has been reengineered from a nimble four-cylinder sports car into something with considerably more attitude under the hood.

Mazda's original MX-5 arrived for the 1990 model year and quickly became the default answer for anyone pining for an old-school British roadster without the old-school reliability headaches. Its formula was simple: modest weight, rear-wheel drive, and a rev-happy four-cylinder paired to a slick-shifting five-speed, wrapped in styling that borrowed just enough from classic European sports cars to feel familiar. That combination made the NA-generation Miata one of the best-selling sports cars of its era, and decades later it remains a popular canvas for owners chasing something entirely different from what Hiroshima originally intended.

According to the selling dealer, this particular example has already lived several lives. It reportedly began as a turbocharged 1.6-liter car before its current owner, who says this is the fourth V8-swapped Miata they have built, dropped in the carbureted 5.0-liter Ford V8 backed by a Ford C6 three-speed automatic roughly three years ago. The engine bay work is extensive, with a Holley carburetor, an aftermarket aluminum intake manifold, an aftermarket camshaft, aftermarket headers, a side-exit exhaust, an aluminum radiator, and an electric cooling fan all reportedly added to keep the V8 fed, breathing, and cool. Underneath, aftermarket adjustable shocks, sway bars, and a set of 15-inch Prime wheels round out the chassis changes, while the cabin gets a Nardi steering wheel, aftermarket seats, and a Pioneer head unit.

Because the driveline swap disconnected the factory speedometer cable, the dealer lists this Miata as true-mileage-unknown, with the odometer currently reading 166,000 miles. A Carfax report reportedly notes minor front-end damage from February 2016, and the dealer discloses that the car has been repainted at some point, that its convertible top fabric is missing, and that the factory speedometer, tachometer, and coolant gauge no longer function. None of that appears to have discouraged interest in the build, which the seller says still delivers the low-end shove one would expect from a small-block dropped into a car that started life weighing barely over a ton.

Pricing a build this far from stock is never straightforward, but Hagerty's Valuation Tools offer a useful baseline for context. A numbers-matching 1992 Miata in #3 (Good) condition currently carries a price-guide value of $8,400, down 8.7% over the past year, while Hagerty's own auction data shows the model has brought as much as $44,626 and as little as $3,520 at public sale over the past three years. Notably, Hagerty's adjustment tool docks a stock Miata's value by 20% simply for having an automatic transmission, which makes this car's V8-and-automatic combination even further removed from what collectors typically reward in an unmodified NA. That gap between collectible and customized is exactly why builds like this one tend to sell on novelty and execution rather than any published guide.

This is not the first time Motorious has covered a small-block transplant redefining an unlikely host car. The LS3-powered 1937 Hudson Terraplane and the 327-powered '66 Nova SS both took a similar approach to blending vintage sheet metal with modern muscle, while the 327 V8 that landed in a modified 1968 Camaro shows the same swap culture at work on a car that already offered a V8 from the factory. Cars & Bids has also hosted its share of unusual builds recently, including a Smyth-converted Audi A4 "Ute" that turned a sedate sedan into a pickup. Whether this Miata's no-reserve auction ends closer to its current bid or considerably higher, it is a reminder that in the world of project cars, the swap is often more interesting than the spec sheet.