Jamie Jeffreys’s 2500hp radial Fox-body Mustang

Jamie Jeffreys’s blown big-block Chev-powered Fox-body Mustang is on a six-second mission

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Photographers: Steve Kelly

It might look like just another Mustang, but Jamie Jeffreys’s Fox-body is an ex-USA No-Prep mauler that has been totally rebuilt into one of the toughest radial cars in the country by Queensland’s Spot On Performance.

First published in the June 2024 issue of Street Machine

“I’ve always had a fascination with Fox-body Mustangs,” Jamie says. “So, when I saw this car for sale after being imported from Missouri, I jumped on it.”

At the time, the ’Stang was powered by a 6.0-litre LQ9 with a 98mm turbo, and had already run an 8.0@174mph off the trailer in Australia under the ownership of fellow Aussie racer, Harley Hamilton, who had imported the car. It had been built for no-prep racing, but it was a bit rough around the edges when it came into Jamie’s possession.

“At the time, l had a VE Commodore that had been four-linked [and was powered] with a twin-turbo LSX combination that I’d built to make 2000hp,” Jamie recalls. “I ditched the VE project to focus on this.”

After having a good look at the car, Jamie decided to pull the trigger on gutting it and asked the team at Spot On Performance to build him a reliable, three-second-capable (over the eighth-mile) radial car. “We ripped everything out of the car back to roof, quarters and firewall,” he says. “It was a big build, and the boys did not cut one corner with the quality of the build or parts selected.”

Once the Spot On crew had the Fox-body ready to party with the LS, Jamie took it roll racing to stretch its legs. “The car was fast; we really cleaned up with that combination,” he says. “But we had a really important drag racing goal, and that was to run in the sixes over the quarter-mile.”

Jamie and the Spot On team took the car down to Sydney for Midnight Mayhem, where it ran a 7.0 over the quarter – so close to that six!

The run proved to the team that some changes were needed. “We were really leaning on the combination,” Jamie says. “It was making around 1700hp, and while we could still drive it on the street, it wasn’t sedate and was prone to breakages. We needed something more serious; we were keen to go with a big-block Chev or a Proline combination but just could not swing it on the budget we had.”

As luck would have it, Jamie and the team found a 632ci big-block Chev originally owned and freshened-up by Queensland racer Stu Henry with the help of Aaron Tremayne. It had a big Vortech blower and was going to make more than enough steam for what they needed.

As far as boosted big-blocks go, this one has got it all. Built around a Brodix block, it sports a Callies crank and GRP rods, and is topped with Big Chief 11-degree heads, a massive Vortech supercharger and a billet Plazmaman intake with a five-inch inlet. The block has also been dry-decked, with water circulated through the heads only.

The inlet has been fitted with dual fuel rails and injector banks housing Excess Racing 2400cc and Billet Atomizer 3500cc injectors. Incredibly, the motor still runs a wet sump, and to save weight, it’s been set up for alcohol for the track, with a front fuel cell feeding a Waterman Big Bertha pump to an Aeromotive rising-rate regulator. A Haltech Nexus R5 controls the whole show.

On 40psi, the big-block belted out an incredible 2500rwhp without breaking a sweat.

Jamie already had a kick-arse trans for the car but decided to trade it for the one that Stu Henry ran when he had the motor: a Reid-cased, two-speed Pro Mod TH400 with twin external dumps and a spragless PTC 10-inch converter.

Down the back of the car is a Strange nine-inch floater with a Mark Williams case, and 3.2:1, 9.5-inch Pro gears. A Spot On track locator, Afco Big Gun shocks and an anti-roll bar round out the rear-end goodness.

The Fox-body runs a three-quarter chassis with a tubular front end and stock firewall. Weight saving has been a priority, which explains the polycarbonate windows, carbonfibre floor on the driver’s side (tinned on the passenger side), a removable fibreglass front clip, and Motor City Solutions Outlaw doors. Both the boot and Andrew Richards Performance Components wing are also made of carbonfibre. All dressed for the prom, the car still comes in under 2800lb (1270kg).

From a build perspective, it’s been a hell of a journey for the Spot On Performance crew, who have fettled the car through multiple evolutions, taking care of everything from the shell up, including the Funny Car rollcage, a massive amount of fab work, full fit-up (twice), and paint.

“For now, we need to make sure the car runs straight and shifts, and the chutes deploy, and from there we will chase it,” Jamie says. “The car still has plenty of power left, but we are not going to beat on it until we can use what we have now.

“I’m addicted to this sport and this car, and I will do anything I can to make [a six] happen. You can’t put a price on happiness.”

We sure can’t argue with that, and we look forward to seeing this missile do its stuff on track.

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