632 cid Big Block Chevy Nitrous Engine - Engine Builder Magazine

632 cid Big Block Chevy Nitrous Engine

If you're looking for a tried and proven big block Chevy combo that can make 150 passes without damage – look no further than this 632 cid big block Chevy nitrous build done by Pat Musi of Musi Racing Engines. It'll deliver 1,250 horsepower NA all day long!

Engine of the Week is presented by

When you spend a few hours hanging with Pat Musi at his engine shop, Pat Musi Racing Engines, in Mooresville, NC, it’s never enough to see just one engine he has being built – you have to see a few! Thankfully, Pat is more than happy to show you engine after engine.

If you’re familiar with Musi’s engine expertise, then you’re well aware he’s a big nitrous guy. It was fitting that we got to hear the details of this 632 cid big block Chevy nitrous engine during our visit. The engine combination has become one of Musi’s staple engine packages.

“This is really an Edelbrock deal,” Musi says. “It’s an Edelbrock manifold and heads. They’re all ported here in-house on our Centroid in the Race Center. These motors are for an entry level guy or grudge racer, and we plan to have these ready on the shelf.”

The 632 big block can come in either an aluminum block version or a steel block version, depending on your budget, and Musi Racing Engines ensures quality components make it into the entire build.

“These engines have all the normal components that we typically use,” he says. “Edelbrock’s Rick Roberts and I developed this 12-degree head a long time ago, and we’re constantly tweaking it, but it’s reliable. We also have the Edelbrock manifold and Jesel valvetrain and belt drive. This engine will go 150 runs before it even needs to be looked at. We haven’t had any failures. It’s a tried and proven piece.

“The valvetrain doesn’t move. Danny [Jesel] and I corrected all the stuff that’s been wrong with the Big Chief-style head. We put three valve cover bolts on and a lot of little, subtle things that change because the rockers were always running into the valve cover bolts and where the rocker bar is had to change – a lot went into this whole build. It’s really for a guy who wants an entry level engine and doesn’t want all the maintenance. Bolt it in and go racing.”

Aside from the heads, manifold and some of the valvetrain, the 632 big block also features a stout rotating assembly.

“It’s a GRP rod and Diamond pistons,” he says. “Due to the supply chain, we sometimes use a Wiseco or Gibtec piston. They’re all good parts. We go through so many parts we have to have a couple suppliers to keep up.”

As mentioned earlier, Musi loves a nitrous build, and this 632 is no exception. Without the nitrous, on a single 1700 APD carburetor, the big block Chevy makes 1,250 horsepower all day long. With a tune up for one stage of nitrous, the engine makes 1,650 horsepower. And, on two stages of nitrous, it’ll get close to 2,000 horsepower.

“You could run it 150 runs at 1,650 horsepower and never have to worry about rings or damage – just follow our instructions and away you go,” Musi says. “It’s a turnkey deal.”

Engine of the Week is sponsored by PennGrade1Elring – Das Original and NPW Companies. 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

ProCharged 540 cid Big Block Chevy Engine

Prior to Sick Week 2024, we saw photos of Big 3 Racing co-owner Chuck Stefanski’s wagon, a 1981 Chevy Malibu rebodied as with LeMans parts, getting finishing touches, including an awesome ProCharged 540 cid big block Chevy engine. Check it out!

Big 3 Racing wagon big block Chevy engine

There’s just something about wagons that hit different. And, if that wagon is anything like the one Chuck Stefanski of Big 3 Racing competes in drag-and-drive events with, it’s certified badass. Prior to Sick Week 2024, we saw photos of Stefanski’s wagon, a 1981 Chevy Malibu, getting the finishing touches before making the trek from Big 3 Racing’s HQ in Hinckley, OH, just outside of Cleveland, all the way down to Florida for Sick Week. Since photos don’t always do a car justice, we knew Chuck was someone we wanted to catch up with – not only because his Malibu wagon was badass, but because it features a ProCharged 540 cid big block Chevy engine!

2,662cc Air-Cooled and Turbocharged VW Engine

This 1969 Volkswagen Beetle was just $600 when Steve Dalton bought it in high school. Having tweaked the performance of the car every year, he’s gone way past that mark and several iterations of the VW engine. Today, it’s a 2,662cc air-cooled and turbo’d VW with a bunch of aftermarket goodies.

Volkswagen Beetle’s Air-Cooled and Turbocharged Engine

This Volkswagen Beetle cost owner Steve Dalton $600 when he bought it back in high school for use as a daily driver. Every year since he’s owned the car, the Beetle and its engine have gotten some sort of performance upgrade to the point that it is at now. Steve is a regular on the

ProCharged 572 cid Big Block Chevy Engine

Inspired to build a hot rod with all its systems exposed, Leroy Edwards used his 50 years of mechanic experience to build this cool-looking car himself. Powering this hot rod is a ProCharged 572 cid big block Chevy engine with nitrous adding an extra kick. Check it out!

big block Chevy engine
Twin-Turbo 6.4L Gen III Hemi Engine

After rebuilding his ‘Lil Red Express truck for the past two years following a collision during the Midwest Drags, Rick Russell got back to drag-and-drive competition at Sick Week 2024. This time, ‘Lil Red Express featured a twin-turbo 6.4L Gen III Hemi engine!

Lil Red Express
Other Posts
The Newest in Nitrous

Nitrous is not new to the game of performance engines, but it continues to make a big impact and every year the technology keeps pushing the needle further.

nitrous
The 2025 NHRA Mission Foods Drag Racing Schedule

In all, the 2025 NHRA Mission Foods Drag Racing Series schedule currently includes 20 races at standout facilities across the country.

Turbocharged Nissan SR20 DET Engine

For a number of years now, Derek and Rita Cho-Sam of DRZA Auto in Tavares, FL have been among our top Nissan engine shops. When we realized that Sick Week would be rolling through their part of Florida, we made arrangements to stop by and see DRZA in person. Derek and Rita gave us a

Nissan SR20 DET engine
When the Industry Comes Together

It’s been said many times and in many ways – this industry of ours is tough to beat – especially when tragedy strikes.