Holley’s 1974 Chevelle Wagon is a 10-Second Turbo Test Bed

If you were born within the 1970s, you likely observed the particular roadside world through the windows of the station wagon. Before minivans plus SUVs, the people mover of choice was obviously a rolling bench-seat bungalow with more sq . inches of glass around the residents than cubic inches under the engine. These suburban family appliances had been long, low, and boring.

But the wagon’s tool can’t be overlooked. The ample interior proportions and versatile seats configurations make them great for hauling plenty of humans and gear. Since many rear-wheel-drive wagon platforms are shared with a few of our favorite muscle cars, wagons are usually low-hanging fruit for hot rodding.

Holley’s low-milage truck only needed a few subtle nips and tucks to give it an even more muscular presence. A frame-off color job in subtle brown plus cream paint job was used on the body. The bumpers were greatly modified and the suspension lowered.

Enthusiasts operate the most successful firms in the auto aftermarket industry, and Holley Efficiency Products is no exception. To demonstrate the options of the company’s wares, Holley selects project vehicles that not only scrape its hot rodding itch yet serve as rolling testing laboratories meant for product concepts and promotion.

When Holley’s main gearhead, Tom Tomlinson (OK, their official title is president plus CEO), came across a 43, 000-mile 1974 Chevelle wagon, he could not pass it up. “I love carriages and frequently search for them. This vehicle from Colorado came up. It had been super-clean with low miles together been decorated with some very hippy-style decals. ”

You are looking at 905 rear-wheel horsepower from the junkyard 6. 0L truck motor. The 76mm Bullseye turbo can be fed by Hooker turbo manifolds and squeezes 19. 5 PSI of boost down the Holley consumption manifold. The only departure from the share long block is a BTE Turbocharged Stage II camshaft and improved valve springs.

Where some overlooked the particular portly fuel-crisis snoozer, squinting on the online auction photos, Tomlinson noticed potential. Interest in GM’s Gen 3 (LS) engines was catching open fire, and Holley fueled the trend with swap-minded products to lower LS engine-swap barriers. The company needed the utilitarian, versatile testbed for items, and the A-body’s quarry-sized engine compartment can accommodate virtually any engine combination. The particular Chevelle would make a great product-development workhorse.

The initial concept for the wagon was “low-buck longroof. ” Planned as a budget-minded spit-shine with a mild drivetrain, the particular third-generation A-body needed a few refined nips and tucks to give this a more muscular presence. Holley drawn the body off the frame and chucked the wheezy drivetrain. The body and lowered suspension were powder coated, and a subtle brown and lotion paint job was applied to your body. The bumpers were shortened in order to suck them tighter to the fenders, with the front piece gaining a lesser opening.

There’s some thing about pulling a column shifter down into D before running a ten-second quarter mile. The 1974 Chevelle wagon’s interior is completely stock, aside from fresh carpet and a Holley EFI Digital Dash.

Other than fresh carpet, the inside remains the same as when it lumbered from the assembly line. The straightforward style continued under the hood, where a boneyard 6. 0L LQ9 yanked from the wrecked truck replaced the Chevelle’s smog-strangled small-block.

Holley topped the engine using its newly developed dual-quad carburetor set up and a set of big-block–inspired coil addresses to motivate the wagon within groovy fashion. A set of Hooker cast-iron manifolds for modern LS motors kept the exhaust system ’70s basic. While the electronics were separated through the hydrocarbons, Holley’s Dominator ECU has been used to run the ignition plus transmission control for the 4L60E transmitting.

No lie: we all found these time slips filled between the back seat cushions throughout our photo shoot.

The wagon had been completed for the 2011 HOT FISHING ROD Power Tour, where it went respectable 14-second quarter-mile times plus sipped less than a gallon of gasoline every 20 miles.

As turbocharging started to drip down to street-driven LS swaps, nevertheless , Holley’s offerings for the hair-dryer unit grew from EFI systems in order to hard parts, including the company’s turbocharged exhaust manifolds.

Will this bring back memories? Before minivans and sport utility vehicles, the individuals mover of choice was a rolling bench-seat bungalow with more square inches associated with glass around the occupants than cu inches under the hood.

Holley’s engineering supervisor, Tim Grillot, filled us within on the details: “We launched the new Hooker turbo manifolds plus wanted a test and marketing automobile. We already had the truck with the LS, and we thought it could be cool to breathe some brand new life into the wagon, as it have been in the same basic configuration for some time. We wanted to showcase how simple our LS turbo manifolds ensure it is for a consumer to add a turbocharged to their LS vehicle. Our objective with the manifolds was to offer a sophisticated, easy solution to turbocharging. Historically, fabricating the turbo headers is the most challenging component to a turbo system. We undertaken that challenge with this very affordable and simple solution. These manifolds, when combined with our own crossover tube, are a direct, bolt on fit for most popular chassis. ”

Grillot’s memory space of workplace water-cooler discussion resulted in a bench-racing showdown: “Tom [Tomlinson] challenged me to help make the wagon run high-11s at complete weight with the stock 6. zero truck engine that was in the vehicle. ” Grillot responded as merely a logical drag racer could; he or she scoffed and quickly stepped one particular lead foot confidently over Tomlinson’s proverbial line in the sand: “Elevens? We’ll run 10s with it. ”

On the street, the truck rides on color-coordinated Circle Race billet aluminum 18-inch wheels protected in 245/45 and 295/45 Nitto NT555 tires front and back, respectively.

While Grillot’s ego confidently sauntered away to his office, the ticker tape of calculations trailed from the water cooler back to their desk. Reeling in the mental adding-machine tape revealed a balance of reddish colored ink. Stock 6. 0L motor, 10: 1 compression, 4, six hundred pounds—the horsepower side of the formula easily had four digits. Blending that kind of power out of the junkyard 6. 0L engine—more compared to once—was a tall order. Chances of Grillot returning from the dragstrip with a 10-second slip or a package of parts seemed about actually.

Bluster apart, Grillot wasn’t completely out of their element. He had built two four. 6L Ford-powered turbo cars: the stick-shift 1965 Mustang that happened to run 10. 80s on 17-inch road tires, and his 1978 Fairmont that will ran 8. 60 with a TH400 trans. Clearly, Grillot knew the particular “soft speed” potential of turbocharging.

In true turbocharged drag car fashion, spent wear out from the 76mm turbo and 50mm Turbosmart waste gate exits ahead of the wheel.

Even though they planned to use the present junkyard 6. 0L engine, Holley knew the stock camshaft plus valvesprings wouldn’t keep the necessary improve from lifting the valves. The Brian Tooley Racing Turbo Phase II cam and PAC valvesprings replaced the stock components. The particular car’s existing dual-quad setup has been replaced with a single-plane EFI a lot more and 95mm throttle-body.

Holley hung the 76mm Bullseye turbocharger off the company’s aforementioned turbo manifold system plus dumped the spent exhaust out there the front right corner. A 50mm Turbosmart wastegate keeps boost in check, and an eBay-sourced air-to-air intercooler chills the intake charge. All of the intake and exhaust plumbing has been fabricated in-house in Holley’s R& D facility.

The particular modified bumpers, two-tone paint, plus lowered stance have us rethinking third-generation A-bodies.

A brushless Holley VR1 mechanical fuel pump feeds a steady supply of fuel towards the Holley EFI injectors, rails, plus fuel pressure regulator, and a Hughes-built 4L80E trans replaced the previous 4L60 unit. Grillot admits, “The rpm converter is a little tight for an enhanced drag vehicle, but this helps along with street manners. ”

A 9-inch Ford axle along with 3. 70: 1 gears expands the package. Holley uses 2 sets of wheels; on the street, the particular wagon rides on Circle Race billet-aluminum 18-inch wheels covered within 245/45 and 295/45 Nitto NT555 tires front and rear, correspondingly. The steelie lookalikes are substituted for track duty with a group of Weld RT-S beadlock wheels calculating 15× 10 inches and keeping 275/60-15 Mickey Thompson drag tires in the rear. The front rolls upon Weld 17× 4. 5-inch Aluma Star 2 . 0 wheels plus M/T Sportsman S/R 28 by 6 tires.

The show biz industry cemented the station wagon’s put in place American pop culture with cameo appearances carrying rambunctious rug rodents, snarky teenagers, and peeved moms and dads down the highway to visit theme recreational areas, eccentric relatives, and inevitable mechanised and mental breakdowns. Ten-second quarter-mile times probably weren’t part of any kind of scripts, however.

When making the required power on the stock engine with 10: one compression, careful tuning is critical. Holley’s Matt Lunsford programmed the Dominator EFI system and squeezed out there 905 rwhp on Holley’s in-house Dynojet Dynamometer with the turbo pushing 19. 5 psi down the share motor’s throat. Peak power had been at 5, 800 rpm, and also a stump-yanking 862 lb-ft of torque peaked at 5, 300 rpm.

Big numbers apart, Grillot speaks glowingly of the Chevelle’s streetabilty: “The car feels just how it looks on the street: super comfy, stylish, and plush. It is a classic treat to drive. The car has AIR-CONDITIONING, power steering, and stock brake systems, so it really drives like a share ’70s cruiser. The engine is extremely mild, and coupled with the tunability of the Holley Dominator EFI system—that manages the engine, transmission, and all sorts of the boost control—everything is very even and easy to drive. ”

The Chevelle’s 4, 600-pound suppress weight makes the car’s ten-second efficiency even more mind-boggling.

But enough about road manners—did it run the number? In Holley’s 2017 LS Fest within Bowling Green, Kentucky, it was period for Grillot to put up—or close up. We were in attendance, plus Grillot quipped: “Get your digital camera ready. I’m either going to operate 10s in this thing or screw it up trying. ”

After strapping on his head protection and pulling the column shifter down into Drive, Grillot headed to the particular burnout box. “There is no transbrake, so it is a little hard to build improve on the starting line. As soon as this rolls out 30 to 60 ft, the boost comes in hard and fast plus it quickly starts making lots of vapor! Before you know it, you are sitting in what seems like grandma’s station wagon, getting criticized in the back and quickly approaching rates of speed that seem unreasonable for the share bench seat! ”

At the track, the street rubber is usually swapped out for a set of Weld RT-S bead lock wheels measuring 15× 10 hold 275/60-15 Mickey Thompson drag radials in the rear. Front side rolls on Weld 17” by 4. 5” Aluma Star second . 0 wheels and M/T Sportsperson S/R 28 x 6 wheels.

Just how fast is unreasonable? How about a ten. 89 at 130 mph? The particular sub-11-second pass gained Grillot important bragging rights—and a friendly reminder from your track that cars shouldn’t operate 10s with a stock interior.

Besides proving away the company’s electronic fuel shot and exhaust components, what otherwise did Holley learn? Grillot states, “Turbos are an easy way to create lots of power! ”

Holley doesn’t plan any kind of major changes to the car soon. “We’re just going to drive this and have fun with it, ” Grillot muses. “The car will be used on Power Tour and other displays. We’ll continue to use it to display and develop new products. Just like any kind of hot rodding project, it is a never-ending evolution. ”

Based on Holley’s Tim Grillot, “There is not any trans brake, so it is a little difficult to build boost on the starting series. As soon as it rolls out 30-60 ft the boost comes in hard and fast and yes it quickly starts making lots of vapor! Before you know it you are sitting in what seems like grandma’s station wagon, getting criticized in the back and quickly approaching rates of speed that seem unreasonable for the share bench seat! ”

Even though Grillot wheeled the car to the magic number, he is quick to credit Holley architectural lab technicians Lucas Embry plus Logan Duvall, who did all the wrenching and assembly of the present setup on the wagon, including the camshaft, turbo, fuel system, transmission exchange, and all associated wiring.

By launching this 2-ton barge into the 10s, this task raises more than eyebrows and requirements. It raises questions about the recognized limits of hot rodding—and the particular bidding prices of mid-1970s A-body wagons.











































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