1967 Shelby GT500 Mustang - Cut Snake - 57

We’ve all heard the saying that a car goes like a cut snake. Lorrin Mathews’s genuine Shelby Cobra really is a cut snake!
Why on earth would anyone chop up a genuine GT500? I bet that question is running through the minds of numerous NZV8 readers right now. We wondered too.
Lorrin Mathews’s answer is short, sweet and simple: “It’s my car and I can, so I did.” That’s a logic that you can’t argue with.
Before
you get too upset, Lorrin is well aware what the car would be worth in
mint original form, and has kept every single part that has been removed
from the car, should he ever want or need to return it to standard.
With the car in the pile of things never to be sold, the chances of it being restored to its former state aren’t high. At the recent Fathers’ Day Drags, where we first spotted Lorrin’s mad machine, he was offered an unlimited blank cheque in return for the car and still said no, so clearly his will is strong.
Finders Keepers
Where exactly did the car come from? It’s not every day you find a GT500 for sale in New Zealand, or overseas for that matter. Much to the surprise of Mustang enthusiasts around the country, it has been in New Zealand for more than 25 years. But for the majority of that time it hasn’t seen the light of day. When the car was brought out to the photoshoot for this magazine, it was just its third outing in 20 years. Now that is what you call a well-kept secret, and the answer to why most people have never seen this vehicle before.
The
restorers out there will be excited to learn that since the Mustang has
barely been driven for that amount of time, its odo reading is
remarkably low; the modifiers will be wondering why the hell he hasn’t
been out using it.
Since buying the car from a cash-strapped mate when he was 21, Lorrin has been restoring it and fiddling with it. After watching too much Mad Max as a kid, he loves wild-looking cars.
With businesses, houses, race cars, race bikes, kids and marriages all coming and going over that time, the Shelby has waited patiently for its build to be completed, and now that it finally is, we’d suggest there probably isn’t another one like it anywhere in the world.
Looks Fast
Shelbys were radical designs when they first came out back in 1967, and Lorrin saw no need to dramatically alter the way the car looked. In fact, it was the opposite. When purchased, the car had been painted an aftermarket colour and was fitted with a sunroof. Lorrin knew the car’s limited production run and its massive appeal meant it should look more original, and the colour needed to be returned to the factory white and blue.
While spraying on the new paint wasn’t hard, removing the sunroof was a bit more involved, and required a new roof skin to be
fitted.
Once the panel side was sorted, Cascade Auto Refinishers had the task
of making the car look as good as it should. Although you wouldn’t guess
it to look at it now, the paintwork was actually completed around
10 years ago.
The original wheels the car came with were safely tucked away in the workshop, and the hunt began for newer, more modern items for the car to roll on. After a conversation with Gary Carter from Carters Tyres in East Tamaki, a deal was done that saw Lorrin do the drainage on Gary’s new house and Gary supply the wheels for the Shelby. Not just any late-model wheels would work; Lorrin was after 19-inch Work brand wheels from the 2007 Ford GT. So while they look like they could have come off a Nissan Skyline or similar, they are far more closely related to the Shelby than you might think.
They measure in at nine-inches wide up front and 12 inches on the rear, so there isn’t much room to spare under the guards. Luckily, Lorrin had no intention of going overboard with the suspension, and he has just updated the components with newer items such as adjustable Koni shocks rather than aiming for a ground-scraping stance.
Goes Faster
Having
owned assorted race cars and ridden speedway motorcycles, Lorrin has a
bit of a penchant for speed, and although the GT500 was the fastest
Mustang of its day, it was never really going to satisfy his
requirements. While ideas of stroked big blocks were thrown about,
Lorrin stumbled upon something even better ” a 6-71 blower. Yes, the big
air pump would upset the purists, but that only made it more appealing.
Knowing a supercharger would require the original bonnet to be cut up, Lorrin wisely set about creating a fibreglass mould of the original, which could be sliced and diced instead.
The motor that resides below the supercharger is the genuine numbers-matching 427 side oiler the car was fitted with as an option from the factory. Being a qualified mechanic, Lorrin assembled the motor himself complete with custom crankshaft, forged rods, 10.5:1 forged pistons and other tough as nails bits.
Why go from being a mechanic to a drain layer? “The sh*t washes off easier than the grease,” Lorrin says, laughing, “and that way I get to enjoy working on my own cars, as it’s not work any more.”
Speaking
of which, recent additions to the powerplant are Shelby alloy heads,
which Lorrin is rightly proud of. With the bigger valves and higher flow
rates these offer over the originals, the car should now be pumping out
even more than the 750hp it was previously creating, which makes it one
very tough streeter indeed.
The transmission was a practical choice. “Toploader gearboxes are horrible bloody things, so we’ve replaced it with a five-speed Hollinger box, which is much better,” says Lorrin. Mating this to the engine is a twin plate 11-inch clutch, which will make for some interesting times when the car first sees traffic. Further down the driveline is a nodular nine-inch diff fitted with a Daytona traction-lock head and 31-spline axles, which should come in handy if and when the car hits the drag strip or circuit, which Lorrin’s quite keen to see it do.
Turns Heads Even Faster
While the package may not be suited for dropping the kids off to school, that’s one of the things Lorrin intends to do with the car now it’s up and running.
Surprisingly, he reckons that the Mustang purists who’ve seen the car have loved it. Then again, I don’t think he really cares whether they do or not. After all, it’s his car, he can do what he wants with it. And that’s exactly what he has done.
Why on earth would anyone chop up a genuine GT500? I bet that question is running through the minds of numerous NZV8 readers right now. We wondered too.
Lorrin Mathews’s answer is short, sweet and simple: “It’s my car and I can, so I did.” That’s a logic that you can’t argue with.
Before
you get too upset, Lorrin is well aware what the car would be worth in
mint original form, and has kept every single part that has been removed
from the car, should he ever want or need to return it to standard.With the car in the pile of things never to be sold, the chances of it being restored to its former state aren’t high. At the recent Fathers’ Day Drags, where we first spotted Lorrin’s mad machine, he was offered an unlimited blank cheque in return for the car and still said no, so clearly his will is strong.
Finders Keepers
Where exactly did the car come from? It’s not every day you find a GT500 for sale in New Zealand, or overseas for that matter. Much to the surprise of Mustang enthusiasts around the country, it has been in New Zealand for more than 25 years. But for the majority of that time it hasn’t seen the light of day. When the car was brought out to the photoshoot for this magazine, it was just its third outing in 20 years. Now that is what you call a well-kept secret, and the answer to why most people have never seen this vehicle before.
The
restorers out there will be excited to learn that since the Mustang has
barely been driven for that amount of time, its odo reading is
remarkably low; the modifiers will be wondering why the hell he hasn’t
been out using it.Since buying the car from a cash-strapped mate when he was 21, Lorrin has been restoring it and fiddling with it. After watching too much Mad Max as a kid, he loves wild-looking cars.
With businesses, houses, race cars, race bikes, kids and marriages all coming and going over that time, the Shelby has waited patiently for its build to be completed, and now that it finally is, we’d suggest there probably isn’t another one like it anywhere in the world.
Looks Fast
Shelbys were radical designs when they first came out back in 1967, and Lorrin saw no need to dramatically alter the way the car looked. In fact, it was the opposite. When purchased, the car had been painted an aftermarket colour and was fitted with a sunroof. Lorrin knew the car’s limited production run and its massive appeal meant it should look more original, and the colour needed to be returned to the factory white and blue.
While spraying on the new paint wasn’t hard, removing the sunroof was a bit more involved, and required a new roof skin to be
fitted.
Once the panel side was sorted, Cascade Auto Refinishers had the task
of making the car look as good as it should. Although you wouldn’t guess
it to look at it now, the paintwork was actually completed around
10 years ago.The original wheels the car came with were safely tucked away in the workshop, and the hunt began for newer, more modern items for the car to roll on. After a conversation with Gary Carter from Carters Tyres in East Tamaki, a deal was done that saw Lorrin do the drainage on Gary’s new house and Gary supply the wheels for the Shelby. Not just any late-model wheels would work; Lorrin was after 19-inch Work brand wheels from the 2007 Ford GT. So while they look like they could have come off a Nissan Skyline or similar, they are far more closely related to the Shelby than you might think.
They measure in at nine-inches wide up front and 12 inches on the rear, so there isn’t much room to spare under the guards. Luckily, Lorrin had no intention of going overboard with the suspension, and he has just updated the components with newer items such as adjustable Koni shocks rather than aiming for a ground-scraping stance.
Goes Faster
Having
owned assorted race cars and ridden speedway motorcycles, Lorrin has a
bit of a penchant for speed, and although the GT500 was the fastest
Mustang of its day, it was never really going to satisfy his
requirements. While ideas of stroked big blocks were thrown about,
Lorrin stumbled upon something even better ” a 6-71 blower. Yes, the big
air pump would upset the purists, but that only made it more appealing.Knowing a supercharger would require the original bonnet to be cut up, Lorrin wisely set about creating a fibreglass mould of the original, which could be sliced and diced instead.
The motor that resides below the supercharger is the genuine numbers-matching 427 side oiler the car was fitted with as an option from the factory. Being a qualified mechanic, Lorrin assembled the motor himself complete with custom crankshaft, forged rods, 10.5:1 forged pistons and other tough as nails bits.
Why go from being a mechanic to a drain layer? “The sh*t washes off easier than the grease,” Lorrin says, laughing, “and that way I get to enjoy working on my own cars, as it’s not work any more.”
Speaking
of which, recent additions to the powerplant are Shelby alloy heads,
which Lorrin is rightly proud of. With the bigger valves and higher flow
rates these offer over the originals, the car should now be pumping out
even more than the 750hp it was previously creating, which makes it one
very tough streeter indeed.The transmission was a practical choice. “Toploader gearboxes are horrible bloody things, so we’ve replaced it with a five-speed Hollinger box, which is much better,” says Lorrin. Mating this to the engine is a twin plate 11-inch clutch, which will make for some interesting times when the car first sees traffic. Further down the driveline is a nodular nine-inch diff fitted with a Daytona traction-lock head and 31-spline axles, which should come in handy if and when the car hits the drag strip or circuit, which Lorrin’s quite keen to see it do.
Turns Heads Even Faster
While the package may not be suited for dropping the kids off to school, that’s one of the things Lorrin intends to do with the car now it’s up and running.
Surprisingly, he reckons that the Mustang purists who’ve seen the car have loved it. Then again, I don’t think he really cares whether they do or not. After all, it’s his car, he can do what he wants with it. And that’s exactly what he has done.


“Climb
the tyres!” someone yelled from behind. The pressure mounted as I rued
my decision to wear skinny jeans that morning. Apparently, I had to do
the splits and climb up the massive 66-inch high tyres with a foot on
each. I did eventually get up and into the cab of the Nissan Navara, but
to say it was an ugly ascent would be a serious understatement.
Back
on the gravel, I’m now strapped into a basic seat in the dust-coated
cabin, I’ve noticed just how high up the vehicle sits on its massive
wheels. Benn fires up the 427 big block Chev and it thunders into life,
roaring out through short exhaust pipes right next to my feet. The noise
is absolutely immense, and as Benn throws the B&M shifter into gear
and squeezes on the accelerator, we jerk forward. Slowly. To be honest,
it sounds as though we are going 100kph, but we are going maybe 30.
lot
larger than a motorbike and with more than two wheels. Having had a
couple of HQ sedans in the past, Nathan decided an HQ coupe would be the
ideal next step.
done
to the 23-year-old panels. The rear guards had been flared to fit
bigger wheels, but just like the rest of the panels, it was pretty
rough. You wouldn’t know it now, though. Every panel was lovingly bashed
back to better-than-factory condition and all the seams and lines now
match to perfection.
it
again he would just buy a crate engine and be done with it. With the
jet boat engine, Nathan and his father had to keep going back to the guy
they got it from, because everything was shagged in it.
before the wedding. Which was being held in Queenstown…
Quicksilver shifter and billet handles, winders, controls and steering wheel.
Engine:

Knowing
just how hard it is to source rust-free Valiant panels, the guys had A1
Fibreglass construct fibreglass replacements. These include the doors,
hood and bootlid, along with a few spares, of course. With the whole lot
coated in PPG Citric Orange by White Bros Panel Works in Hamilton,
you’d be hard pressed to tell they weren’t steel, till you feel just how
light they are.
The
suspension side of things was a major, and one of the more
time-consuming aspects of the project. The solution to the car’s
inherent problems was to create slip-joint style half-shafts, which
would increase and decrease in length through the suspension travel.
When combined with an extra suspension link, and set up to perfection on
a computerised suspension analysis programme, the result is genius. Of
course, the basics, such as fitting adjustable shocks and a Guldstrand
transverse leaf spring, were also taken care of. The modified rear
arches allowed for the track to be widened for optimum road-holding
ability, too.
While
the car hasn’t made it onto the circuit for a shakedown yet, with the
engineering finesse and thought that has gone into the build, we can
only assume it will be an impressive sight. But what class will it race
in? Dave’s not too sure, and to be honest, he’s not really that fussed.
He built it how he wanted it rather than how someone else told him to,
and if that leaves him relegated to track days and street driving, then
so be it.
bit different.
Favourite Teacher
The Snowball Effect
interior off), we’re assuming the days of taking kids on school trips in the XM are over.
Wheels/tyres: 17×7-and 18×10-inch Boyd Coddington Smoothie II rims, 215/40R17 and 275/35R18 Kumho tyres




offer. Standard equipment by today’s standards, but back then it was pure luxury.
Unlike
the original 300 series you pretty much get all the options as
standard, including air conditioning, electric seats, an adjustable
steering column and a Boston Acoustics speaker system, just to name a
few.
is
selected gear changes can be made by pushing the lever left for down or
right for up. The system certainly makes manual selection of the gears a
breeze as there’s no alternate gate for this mode, it works straight
off the Drive position.
you know there’s plenty of weight being pushed around, and tighter ones produce signs of understeer.
Of
course, we are no longer quite so hirsute, nor do the same things pose a
threat, but that original, basic defence mechanism is still there,
showing itself when it deems appropriate. For any true enthusiast, one
of those moments is the firing of an all-American big block V8 like the
512ci Mopar in Adrian Betterton’s 1971 Chrysler Valiant. The starter
motor whines as the crank inside the engine begins to turn. After a few
chugs, coughs and splutters, 512 cubic inches of American iron roars
into life, the ground vibrating underfoot as it finds idle. The motor
begins to warm, and the deep, guttural Mopar roar begins to surge and
ebb under the spell of an aggressive camshaft spinning in the bowels of
the beast.
sneaking
bits and pieces onto the car as they came up. For example, Adrian
explains, “It was time for new tyres, but there was no way I was going
to fork out for the same stuff again, so I called up Lance at Arrow
Wheels. He sold me a set of 17×7-inch and 17×9-inch Sabres, and then
custom fitted them to the Valiant. From there, it just got more and more
out of control.”
together.
Before
the Chrysler could be called finished, it needed a refreshed interior,
as this one had taken a beating over the previous three decades. Adrian
took the beast down to Alvin at Stock Upholstery, who reupholstered the
interior in simple black, with a tidy red pinstripe to match the car’s
exterior. Besides the new look, the only other interior enhancements are
a set of Auto Meter Pro Comp gauges, a Hurst pistol grip shifter and a
steering wheel pulled from an R/T Charger.
Driveline: 727
transmission, 440 Source Hemi 7/16 flex plate, Boss Hog 10-inch hemi
7/16 bolt torque converter (2200rpm stall), shortened nine-inch diff,
LSD head, 3.25 gears
the partially disassembled car that he couldn’t refuse, and the deal was done.
decided to take advantage of his misfortune and do it now.
While
the panel work was taking place, an engine was being built on the other
side of the world. It’d be a stretch to fit the big cube Hemi and
associated hardware within the engine bay, so the shock towers were
scalloped in preparation and all unused holes filled.
mention
(check out the specs on p26 for confirmation of that). But as a teaser,
the MP Hemi Mega Block is filled with 7.10-inch Eagle H-beam rods,
which, combined with the Callies 4340 4.750-inch stroke, crank give the
engine a massive 605 cubic inches of capacity.
Forced
induction? “Not needed,” Brent reckons. And with the setup making a
massive 900hp at 6000rpm and 1152Nm at 4900rpm, he’s not wrong.
Tamaki.
Backing this up is a Dana 60 diff, and judging by the smile on Brent’s
face each time he exits the vehicle, it doesn’t get an easy time back
there.
Chrysler
Rallye wheels are a modern interpretation of the vehicle’s original
Rallyes, and were custom built with the desired backspace to fill out
the guards. Not only do they fit, they fit perfectly, and suit the
modern look Brent sought while paying homage to the car’s roots.
We’re
talking stuff like all the interior and exterior lighting ” including
the instruments ” being converted to LEDs, and the installation of an
electronic rear vision mirror with built-in LCD screen.
and
out, dual three-inch system with X-pipe exhaust built by Magnum
Automotors, dual three-inch Flowmaster mufflers into dual three-inch
glass pack resonators, custom four-core Hemi radiator, fixed seven-blade
Hemi fan and full shroud, FAST ECU with custom mapping, Billet
Specialties Tru Trac Serpentine belt system, Sunnen air conditioning
short compressor, 140 amp alternator, Hydra boost combined power
steering and brakes, shock towers cut and laid back 20mm to allow engine
and header clearance. All unused holes and mounts filled and smoothed
welded to chassis at left rear of engine to reduce chassis twist