Edelbrock-Musi 555 cid Big Block Chevy - Engine Builder Magazine

Edelbrock-Musi 555 cid Big Block Chevy

Pat Musi Racing Engines, in conjunction with Edelbrock, recently announced they’d be building a series of 555 cid big block Chevy engines, which are much more attainable than Musi’s typical drag race set ups for PDRA or NHRA. The engine, being called the Edelbrock-Musi 555, comes in three different configurations. Find out what goes into these high-horsepower engines.

Engine of the Week is presented by

When we last caught up with Pat Musi of Pat Musi Racing Engines in Mooresville, NC, we got the full scoop on his 959 cid nitrous engine built specifically for drag racing. In fact, since Musi moved his shop to Mooresville back in 2012 from the New Jersey area, the racer and engine building legend shifted his shop’s focus. While he used to occasionally take in some routine engine work, like a 350 Chevy or LS build, he decided eight years ago to focus strictly on drag race engines, and it’s been that way ever since.

However, Musi, in conjunction with Edelbrock, recently announced they’d be building a series of 555 cid big block Chevy engines, which are much more attainable than Musi’s typical drag race set ups for PDRA or NHRA. The engine, being called the Edelbrock-Musi 555, comes in three different configurations – AVS2 Carbureted, Pro-Flo 4 EFI, and Pro-Flo XT EFI.

Obviosuly, given both Edelbrock’s and Musi’s historical pedigrees, the engines make use of top-quality, American-made components and are assembled by hand at Musi’s state-of-the-art engine shop. Each of the three engines are designed to deliver huge performance gains on pump gas.

For the consumer, there are major advantages to dealing with a combined Edelbrock-Musi produced engine. First, the consumer gets high-quality and high-performance parts that Edelbrock has proven to deliver, along with Edelbrock’s customer service department.

Second, is the engine building and tuning expertise of Pat Musi. “Edelbrock is known for their street performance and we are proud of the track record we’ve built with our racing engines,” Musi says. “I have the first prototype 555 engine installed in my personal ‘67 Camaro, the car I started racing with. It hauls ass down the track and has been trouble free for over 10 years.”

At $15,000, the Edelbrock-Musi 555 cid carbureted engine features a 9.8˝ deck big block and Edelbrock components including CNC-ported aluminum cylinder heads, a Victor Jr. intake manifold, forged 10:1 pistons, a 4.250˝ forged steel crank, an AVS2 Series 800 CFM carburetor, a Rollin’ Thunder hydraulic roller camshaft and valvetrain, and Max-Fire ignition system.

Carbureted version

This engine delivers 676 horsepower and 649 ft.-lbs. of torque on 91 octane pump gas. The Edelbrock E-CNC cylinder heads are fully CNC ported to achieve optimal air-flow for maximum horsepower and torque in high performance street and light-duty racing applications. This engine features exhaust port exits in the stock location, which allows for the use of off-the-shelf headers.

The next level up, at $17,000, is the Edelbrock-Musi 555 Pro-Flo 4 EFI engine. This variation comes complete with Pro-Flo 4 electronic fuel injection and is assembled with intake manifold, fuel injectors, fuel rails and throttle body, ECU, handheld calibration module, high-quality billet distributor, complete harness, O2 sensor and bung, fuel hose, hardware and software.

Pro-Flo 4 EFI version

The Pro-Flo 4 EFI  can be fine-tuned with the handheld calibration module without the need for a laptop and boasts 697 horsepower and 643 ft.-lbs. of torque when tuned to run on 91-octane pump gas.

The third and top-level variation of the engine is the Edelbrock-Musi 555 Pro-Flo 4 XT EFI at $17,500. The XT is the most powerful of the three engine packages at 723 horsepower and 652 ft.-lbs. of torque, and features the Pro-Flo XT EFI.

Pro-Flo XT EFI version

The Pro-Flo XT EFI system consists of a skillfully engineered intake manifold with a unique design that delivers more horsepower and torque than a traditional single-plane intake manifold.

The Pro-Flo system includes everything needed to bolt in and go, such as fuel injectors, fuel rails, O2 sensor and bung, throttle body, ECU and handheld calibration module. The ECU is self-learning, making initial start-up and tuning a breeze.

All three versions of the 555 cid engine are competition ready, yet ultra-reliable for daily street use, and all three can be dropped in and used with standard drivelines. The standard deck block allows the engine to be installed in most cars without hood clearance issues, and the standard exhaust port location allows for the use of off-the-shelf headers.

“We see our relationship with Pat Musi and our involvement in the new Race Center as key elements to our future growth,” says Don Barry, CEO of Edelbrock. “We can’t think of a better organization to ally ourselves with than Musi Racing. Their reputation for building high performance, reliable engines is legendary.”

With every 555 engine purchase, the buyer receives a one-on-one call with Pat Musi to discuss the customer’s setup, a certificate of authenticity signed by Pat Musi, an exclusive 555 owners club decal, and of course, a powerful, new engine.

Engine of the Week is sponsored by PennGrade Motor Oil and Elring – Das Original.

If you have an engine you’d like to highlight in this series, please email Engine Builder Editor, Greg Jones at [email protected]

You May Also Like

1,700-HP Supercharged Suzuki-Based Top Fuel Motorcycle Engine

Making a 1/4-mile pass in 5.50 seconds at nearly 270 mph requires zero mistakes by both the racer and the crew. That ET is the current Top Fuel motorcycle world record belonging to Larry “Spider-Man” McBride. We got to speak with him and learn more about his 1,700-hp supercharged Suzuki-based Top Fuel motorcycle engine.

My son is a Marvel fanatic. And let’s be honest, most kids these days are obsessed with Marvel super-heroes. In my house, the Avengers are a constant topic and Spider-Man is on TV at least three days a week. Spider-Man has many talents, of course, but riding a 270-mph Top Fuel motorcycle isn’t in the comics, TV shows or movies. Maybe it should be!

Vortech Supercharged 572 cid Big Block Chevy Engine

When David Pearson of Little Evil Racing shows up at the track with his Pro 275 Foxbody Mustang, people fear him, and for good reason. David has set numerous 275 drag radial world records, and with a Vortech supercharged 572 cid big block Chevy in this Mustang, another record may fall!

422 cid Small Block Chevy Circle Track Engine

We were treated to a shop tour of Terry’s Machine Shop by owner Todd Gilliam. This old-school machine shop outside of St. Louis does a little bit of everything, and they had just wrapped up this badass 422 cubic inch small block Chevy engine for a circle track customer. Check it out!

Supercharged 500 cid Billet Hemi Engine

Doc Baker is a racer and builder who does things his own way. A perfect example of his work can be seen under the hood of his 1971 Dodge Demon – this supercharged 500 cubic inch billet Hemi engine. Check out what went into the build!

521 cid Blown Big Block Chevy Engine

According to owner Colin Jost, this 521 cubic inch blown big block Chevy engine doesn’t know it’s a Chevy since everything was built like a Hemi. Regardless, it’s 2,500 horsepower of awesomeness. Check it out!

Other Posts

Stefan Gustafsson’s Turbocharged Big Block Chevy Engine

We didn’t get the opportunity to speak with Stefan Gustafsson during the 2022 edition of Sick Week, and after he won the whole event that year, we knew we couldn’t attend the 2023 event and not talk to him this time. We got the chance to speak to Stefan about his C4 Corvette and its

PennGrade1 Partners with American Motorcycle Racing Association

A new partnership between PennGrade1 and the American Motorcycle Racing Association begins March 31.

Michael Westberg’s Twin-Turbo 400 cid LS Engine

Michael Westberg, who hails from Sweden, has been racing here in the U.S. recently and he’s been a force to be reckoned with at drag-and-drive events. His Chevy S10 pickup truck features a twin-turbo 400 cubic inch LS engine built by ACE Racing Engines, and the engine just propelled Michael to a Sick Week victory

Reviewing Callies’ Ultra I-Beam Connecting Rods

For our small block Ford build, we opted for a set of Callies’ Ultra I-beam connecting rods. We went with a 6.200″ rod that features a Chevy rod journal, despite our engine being a Ford platform. This rod’s quality construction and strong material make it a great choice for numerous applications and engines. Related Articles