All-Billet Twin-Turbo 632 cid Big Block Chevy Engine - Engine Builder Magazine

All-Billet Twin-Turbo 632 cid Big Block Chevy Engine

Steve Morris specializes in boosted, 1,000+ HP engine builds only. As such, one of his recent customers chose to have a used SME engine rebuilt to run on pump gas and methanol. It's this all-billet, twin-turbo, 632 big block Chevy. Find out how much it made!

Engine of the Week is presented by

Most of you likely know Steve Morris by now. He’s an engine builder who doesn’t need much of an introduction. He’s been building 1,000+ horsepower engines for a long time now, and he’s also been in front of the camera a lot the past two years as part of his Steve Tech video series, which he has partnered with Engine Builder on to help distribute.

632 big block Chevy

Steve does a great job of breaking down the many aspects and theories of engine building, and it’s no surprise given his background and engine building resume. Steve’s shop, Steve Morris Engines, is located in Muskegon, MI and has the capabilities to do all engine work in-house, including dyno testing and tuning.

Steve started out engine building in high school before going to Fair State University to take the school’s automotive machine program. He then started working for a local shop before heading to Dart Cylinder Heads and working in the Pro Stock engine program.

“I gained a lot of experience there,” Morris says. “In fact, that’s probably where I gained a vast majority of my startup experience. I worked there for a few years and then decided I wanted to go out on my own.”

That’s when Steve opened Steve Morris Engines (SME), but it wasn’t until 2010 that Steve bought out his partners in order to run the shop exactly how he wanted. Today, Steve Morris Engines specializes in all boosted motors, despite Steve’s prior experience in naturally aspirated NHRA Pro Stock.

“My niche has really been developed into boosted engines – centrifugal supercharged and turbocharged engines – and currently today we don’t do anything less than a 1,000 horsepower,” Morris says.

The engine shop has several full-time employees, two engine dynos, a hub dyno, a chassis dyno, several balancers, several CNC machines, a line hone, and a boring mill.

“I do everything in-house outside of crankshaft grinding and cylinder head porting,” he says.

Just recently, Steve finished up work on a customer engine – a 632 cubic inch, twin-turbo build that runs on both pump gas and methanol. The customer is Aaron Jambor, who hails from Nebraska. This 632 big block Chevy is actually a used engine from SME that Jambor selected to rebuild with Steve.

“It is a pretty bad dude,” Morris says of the engine. “Honestly, it’s a pretty bad dude. It’s an all-billet, 5˝ bore space big block Chevrolet – 632 cubic inches. This runs on methanol for race, and the third set of injectors is the street injector for pump gas. We have two fuel systems directly on the car.”

88mm turbos

The 632 big block is set up with Holley EFI, titanium connecting rods, a 65mm roller bearing camshaft, an SME billet intake manifold, SME valve covers, and a pair of Harts 88mm turbos with TurboSmart wastegates.

“There are some really cool pieces in this motor,” he says. “This is a Drag Week set up. It’s a fully water-jacketed, 5˝, all-billet motor.”

methanol injectors

Steve set up the engine on his in-house engine dyno with a methanol tank connected to the methanol pump and system on the engine, as well as a pump gas system connected to the engine. Steve tested the engine on both fuels, but says that the engine isn’t a maximum effort pump gas deal. It’s just meant for a little fun on the street given its small street injector.

“It’s an interesting comparison between pump gas and methanol at these real low boost levels,” he says. “The big cubic inch engines with big turbos on methanol always make really big horsepower. They just seem to be in sweet spots of the map. They just really work well.”

Steve first tested the engine on 93 octane pump gas using a street tune, which was no boost and just running on a wastegate with a 3 psi wastegate spring. Running on 93 octane with 4.5 lbs. of boost, the 632 big block made 1,341 hp at 6,700 rpm and 1,070 lb.-ft. of torque at 6,500 rpm.

“The engine lays down after 1,300 horsepower because we weren’t throwing any more boost at it,” Steve points out. “That’s the nature of big cubic inch engines where we’re not ramming more air through them. As soon as it reaches a certain spot, it will naturally lay over. Since we’re not spinning the turbo any faster, it technically becomes some form of a restriction.”

On methanol and just the wastegates with 5.5 lbs. of boost, the engine made 1,800 hp at 7,100 rpm and 1,397 lb.-ft. of torque at 6,100 rpm.

“You have to remember that the curve isn’t linear – just because the engine made 1,800 hp on 5 lbs. of boost, doesn’t mean it will make 3,600 hp on 10 lbs. of boost or 5,000 hp on 20 lbs. of boost – it doesn’t work that way,” Morris says. “It’s just at a very efficient spot on the map. It’s moving a lot of air versus pressure. Boost is a restriction number. It is not a flow number per say. It’s how much restriction the air pump is presenting to the turbos.”

Steve ran the engine this way to showcase the difference in horsepower it could produce just given the different fuels.

“It’s interesting to see the difference between pump gas and methanol,” he says. “The methanol gives it more energy and more boost given the exact same system and everything – it’s just fuel to fuel differences.”

Of course, Steve didn’t end the testing and tuning there. With the boost turned up to the point that it was meant to run, the 632 produced 3,637 hp at 7,800 rpm and 2,460 lb.-ft. of torque at 7,700 rpm. The boost level reached 30 lbs. at 7,800 rpm.

“These turbos are pretty much done at that point, but even so, it’s outstanding,” Morris says. “This engine is going to be a super solid piece for Aaron in his Chevy II street car.”

Engine of the Week is sponsored by PennGrade Motor OilElring – Das Original and Scat Crankshafts. 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

Turbocharged 388 cid LS Engine

When you look at a Volvo wagon, all sorts of things come to mind, but running quarter-mile passes of any speed usually isn’t one of them. However, Mikael Borggren’s 1987 Volvo with a turbocharged 388 cid LS engine capable of 6-second passes is definitely a sight to see! Read up about all the engine details!

We first got a glance at Mikael Borggren’s LS-swapped Volvo wagon at the inaugural Sick Week in 2022, and we instantly fell in love with it. The unassuming, “soccer mom” vibes of the Volvo paired with the performance of a turbocharged LS engine made for a surprising result on the track – 6-second quarter-mile passes at 200+ mph!

118mm Turbocharged 540 cid Big Block Chevy Engine

These days, a 200+ mph pass at a drag-and-drive event like Sick Week, is commonplace. However, it’s not every race you watch a competitor’s doors literally get blown off. Stefan Gustafsson did just that while running a PR of 6.43 at 218 mph thanks to his C4 Corvette and its turbocharged 540 cid big block Chevy engine. See what’s in this 2,100+ horsepower engine!

Twin-Turbo 400 cid LS Next Engine

Achieving five consecutive days of mid-6-second passes and 1,000 miles driven on the street earned Michael Westberg the 2023 Sick Week overall win. His Chevy S10 features a 400 cubic inch twin-turbo LS Next engine. See what’s in this engine build done by ACE Racing Engines!

Turbocharged 388 cid LS-Swapped 1973 Toyota Celica

Proof that cars from the ’70s were awesome is Steve Groenink’s 1973 Toyota Celica. Saved from a farmer’s field, this Celica features a turbocharged 388 cid LS engine capable of 6-second passes. Check it out!

Twin-Turbo 429 cid Ford Boss Engine

Earl Schexnayder of Schexnayder Racing is a Ford guy through and through. As such, he has been entering drag-and-drive events with his 2000 Cobra Mustang and a twin-turbo 429 Ford Boss engine since 2011. Check out what makes this Ford combo a sweet one!

Other Posts

Jason Sack’s Turbocharged 429 cid LSX Engine

Jason Sack had arguably one of the nicest Novas we saw during Sick Week 2023. The car’s beauty had some sort of gravitational pull as we walked passed it in the pits. Naturally, we gave in and stopped to have a chat with Jason Sack about his 1969 Nova and its turbocharged 429 cid LSX

1968 Chevelle with a Twin-Turbo 427 cid LS Engine

This 1968 Chevelle, owned by Tanner Stover, was thought out from the beginning to handle drag-and-drive competitions, and no detail was left undone. The gorgeous car features a twin-turbo 427 cubic inch LS engine capable of running 7-second passes! It’s our Engine of the Week! Related Articles – Why You Should Machine Your Connecting Rods

Kyle Morris’ Twin-Turbo Small Block Ford Engine

As Steve Morris’ son, Kyle Morris is no stranger to engine work and drag racing from his seat at Steve Morris Engines. This 1996 Mustang was purchased by Kyle at the age of 15, and he now has it ready to rip 7- and 8-second 1/4-mile passes thanks to an 1,800-horsepower, twin-turbo small block Ford

Tina Pierce’s Twin-Turbo 509 cid Big Block Chevy Engine

Striving to make 200-mph passes during Sick Week, we came away impressed by Tina Pierce and her Chevy II Nova, which features a twin-turbo 509 cubic inch big block Chevy engine. The race veteran was attending her first Sick Week and we got the details of her drag-and-drive setup in this episode of Engine of