Designed, developed and manufactured in-house, the 32-Valve DOHC SB4 7.0 engine adapts our proven high-performance valve train to a customized LS-based cylinder block that produces a staggering 750 naturally aspirated horsepower. Mercury Racing’s advanced four-valve cylinder head combustion system and dual overhead camshaft valve train provide significantly improved performance and durability compared to a standard two-valve design.
Roadster Shop is the exclusive SB4 distributor. The Mundelein, Illinois based company has been an automotive aftermarket industry mainstay in performance chassis fabrication and custom car building for over 30 years.
The project started with a call from Roadster Shop customer William Fox. William wanted to build a muscle car, something to compete with any late model European sports car. While reviewing available engine/power options William was intrigued by the new SB4 for its high rpm operating band and naturally aspirated, 750 horsepower.
The SB4 Chevelle qualified as a Roadster Shop “Survivor Series” build; a car that arrives clean in its original condition. The body is stock with the exception of some minor work to the transmission tunnel, and firewall. The paint, which ironically is very close to our Mercury Racing Blue, is original as are the chrome bumpers.
This iconic American muscle car has all the conveniences of a modern automobile. Roadster Shop re-engineered and rebuilt the complete vehicle. All new wiring and plumbing was installed. It features a custom Roadster Shop Fast Track chassis and high performance suspension. The SB4 is coupled to a Tremec/Bowler T56 6-speed transmission. Roadster Shop even built custom stainless steel headers and a complete exhaust system. Massive 345/40/19 (rear) and 265/40/18 (front) tires are mounted on all-new RS OE-2 wheels. A C& R Racing radiator keeps the SB4 cool as it runs through the gears up to its 8000 rpm rev limit.
The interior is updated with sound deadening material, modern instrumentation, cruise control, sound system and power windows. Recaro Expert seats provide support for the driver and passengers to comfortably experience the SB4’s full capabilities.
Roadster Shop debuted the SB4 Chevelle at the Goodguys 2018 PPG Nationals, July 6-8 in Columbus, Ohio. Roadster Shop personnel and fans alike were blown away with the SB4’s smooth idle and user friendly running qualities.
“This is by far the smoothest, cleanest performing engine we have ever used. It feels like its not even trying to make all of that power, almost effortless. The smoothness is noticeable throughout the entire rpm range, from idle to 8,000 rpm,” said Roadster Shop director of business development Josh Henning.
“This package really does a number on your senses. It gives you an organic analog connection to the car with a smooth powerband to create a hybrid muscle car/super car experience like we have never felt before.”
We are excited to see what Roadster Shop has planned next for the SB4. You can be assured it will be the baddest build in its class.