427 LSX Twin Turbo Engine - Engine Builder Magazine

427 LSX Twin Turbo Engine

We’ve now covered a couple of engine builds done by Ramiro Ramirez of Fat Boys Racing Engines, and each one gets better than the last. He's already showcased a 502 LS and a forced induction LSX build. His latest creation is this 427 LSX twin-turbo engine built for a street/strip application.

Engine of the Week is presented by

We’ve now covered a couple of engine builds done by Ramiro Ramirez of Fat Boys Racing Engines, and each one gets better than the last. We were first introduced to Ramiro during fall 2020, when he messaged us on Instagram to tell us about his shop and his engine work. Located in Monterrey, Nuevo Leon, Mexico, Ramiro’s shop, Fat Boys Racing Engines, has been building high-performance V8 engines for nearly 17 years.

Standard deck 427 LSX block

Fat Boys Racing Engines has a focus on naturally aspirated and nitrous engine builds, and has recently started to offer forced induction builds as well. The shop’s engines are most commonly used for street/strip, drag racing and sand drag applications.

As Ramiro continues to push the envelope with his builds, he takes pride in showing off his work, and we’re glad he chooses to share his engine builds with us. Previously, Ramiro shared a 502 cid LS build and a forced induction 427 LSX.

4.000˝ stroke crank

This most recent engine build is another 427 LSX that’s slated to be boosted via a twin-turbo setup and will be going in an SS Silverado pickup. Ramirez started the build utilizing a 427 LSX Bowtie block with 11:1 compression in order to deliver strong horsepower and torque figures in a naturally aspirated setup at first. The twin turbos will be added to the build later so they can be configured in the best possible position.

CP flattop pistons and 6.125˝ rods

The LSX block is a 9.260˝ standard deck block that will be outfitted with ARP head studs, Mahle H-style main and rod bearings, and a rotating assembly that includes a 4.000˝ stroke, 8-counterweight crankshaft, billet 6.125˝ I-beam connecting rods, and CP forged flattop 4.127˝ bore pistons with .230˝ wall chromoly wrist pins. In fact, all the parts in this build are quality components ready to take the abuse of twin turbos.

Cam Motion camshaft

The valvetrain setup features a hydraulic camshaft, which Ramiro got custom designed from Cam Motion that has 670 lift and a 115 lobe center. For cylinder heads, Fat Boys Racing Engines chose a set of Frankenstein M311 heads with titanium valves. The heads were completed with Johnson hydraulic short-travel lifters, Texas Speed rocker arms and trunnion kit, Manton custom-length pushrods with a .145˝ wall, and .040˝-thick head gaskets.

The LSX has Frankenstein M311 cylinder heads

Some of the other components include a Melling high-volume oil pump, an ATI super damper, a CSR aluminum flexplate, Holley Terminator X EFI, Injector Dynamics injectors, and a Holley 105mm throttle body with a Holley Hi-Ram LS3-style intake.

The LSX engine will run naturally aspirated at first before the twin turbos are added to the setup. Once fully completed, this SS Silverado will be used on the street and on the track in Houston and in Mexico.

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

427 cid Ford Windsor V8 Engine

This one-of-one Panozster we saw at the Cleveland Auto-Aviation Museum features a number of unique traits that make it a truly special roadster, including its 427 cubic inch Ford Windsor V8 engine! Check it out.

There’s an abundance of very cool cars out there in the world, but despite all those cool cars available, some folks would rather build a car that’s entirely their own, and therefore, a one-of-one example. That’s what we were treated to when we recently visited the Crawford Auto-Aviation Museum in Cleveland, OH – a one-of-a-kind, 1948 Panoz Roadster featuring a 427 cubic inch Ford Windsor V8 engine. We got the full rundown of this build, which took 13 years to complete, from the Crawford Museum’s Program and Marketing Manager, John Lutsch.

2,600 HP ProCharged 540 cid Big Block Chevy Engine

BB&T Racing in South Haven, MS has been building high-performance domestic engines for 30 years. One of their latest builds is for a drag racing customer looking to go faster utilizing an F3 ProCharger. Check out this 2,600 hp ProCharged 540 big block Chevy engine!

615 cid Big Block Chevy Nitrous Engine

It’s no secret that turbochargers dominate the power adders seen in drag-and-drive events, and to a lesser degree, superchargers. However, very few competitors resort to nitrous. Graham Hayes is one of those nitrous believers, and his Buck Racing Engines-built 615 cid big block Chevy engine put on a strong performance all five days of Sick Week 2023. Check it out.

468 cid Big Block Chevy Engine

Kevin Willms has owned this 1930 Ford Roadster since the age of 17. He’s now 62 and getting into the drag-and-drive scene with the roadster and its 468 cid big block Chevy engine. Check it out!

Sick Week’s Fastest 4-Cylinder – a Turbocharged 2.0L 4G63 Engine

Tony Niemczyk has owned his 1995 Mitsubishi Eclipse since 2001. Over the years, it’s been a constant evolution to get the car from a regular commuter to the point it is today – a streetable race machine with the claim of Sick Week’s Fastest 4-Cylinder and back-to-back Sick Week Freaks class wins. That’s thanks to a turbocharged 2.0L 4G63 engine. Check out the details!

Other Posts

Pat Musi Racing Engines’ Outlaw 4.840 Bore Space Nitrous Engine

We love every opportunity we get to speak with Pat Musi of Pat Musi Racing Engines. This time, we were down in Mooresville, NC to check out his shop in person and get the details of a few engine builds he had underway. This is an Outlaw 4.84 nitrous engine with 731 cubic inches of

Wilkins Racing Engines’ 632 cid Big Block Chevy Nitrous Engine

Sandy Wilkins of Wilkins Racing Engines recently allowed us to visit his engine and machine shop in Mooresville, NC. We were thoroughly impressed by how clean and organized his shop was and the caliber of the engines his shop churns out. We got the full details of this big block Chevy nitrous engine he built

Harrell Engine & Dyno’s 2,500+ HP Turbocharged 448 cid Billet LS Engine

We all know Pete Harrell of Harrell Engine & Dyno in Mooresville, NC is real good at doin’ stuff, like building high-horsepower, forced induction engines. Earlier this summer, we stopped by HED for a tour and to talk to Pete about some of the current builds he had going on. One of the engines nearing

Scat Enterprises To Move Into Vortech Engineering Facility

Scat Enterprises will be moving headquarters from Redondo Beach, CA to Oxnard, CA by March 2024.