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GM’s most recent offering in the LT Gen V iron block lineup is what horsepower dreams are made of. Known as the L8T, you can find the motor in the 2020 and newer Chevrolet and GMC HD trucks. The newly designed block is thick in all the right places coming in at 6.6-liters, which lends itself to being the perfect factory platform to build on. The team at Scoggin-Dickey Parts Center (SDPC) Raceshop saw this potential and wanted to see what they could do if they put their touches on an L8T build, with the goal being 2,000 horsepower safely. 

The SDPC Raceshop crew began the project by sourcing a new L8T block and crank. To prepare their new block for the power numbers they had in mind, the team installed billet steel main caps and a set of ARP studs. In addition, as part of their Race Prep package, the block is drilled to accept both LT and LS style cylinder heads. For this build, SDPC bolted on a set of their CNC ported LT4 heads that utilize the factory rocker arms. They also added their CHE Trunnion upgrade along with upgraded valve springs and pushrods. Internally, a set of Callies Ultra rods and Wiseco forged pistons with Total Seal piston rings round out the rotating assembly. The factory crankshaft is a forged piece, more than capable of handling the power level the team was attempting to achieve. 

While Scoggin-Dickey was pretty open with this build, they didn’t disclose the specs of the camshaft, although it does allow the engine to spin to a 7,500 rpm redline easily. A Holley Hi-Ram intake manifold coupled with Holley’s 102 mm throttle body was pulled from the SDPC shelves and put into action for the top end of this build. To finish off the core of this beast, the Raceshop used more parts from the SDPC catalog. A balancer from ATI Performance Products, Moroso oil pan, Peterson Fluid Systems external oil pump, and Hooker Blackheart exhaust manifolds complete the engine. 

For making the level of power the SDPC guys wanted, they decided to go with twin turbochargers. In this case, two of Precision’s 7685 ball-bearing turbos push 32-pounds of boost through a Shearer Fabrication water-to-air intercooler. Precision 46 mm wastegates and 64 mm blow-off valves keep the boost under control. The fuel of choice is VP C16 delivered by port injection using Holley EFI fuel rails and injectors. 

The Raceshop used Holley’s Dominator EFI system for electronics to perform the testing. Strapped to the engine dyno and ready to make some noise, the SDPC L8T put up power numbers sure to raise the eyebrows of any enthusiast. Surpassing the goal of 2,000 horsepower, the L8T made 2,077 ponies and 1,785 lb-ft of torque at 6,500 rpm. Big numbers for a stock block and crank using primarily off-the-shelf parts. This means the same monster can be in your next project simply by ordering the parts from Scoggin-Dickey Parts Center. The guys at SDPC want you to build an L8T of your own so badly that they provided a build list with details and part numbers. 

SDPC Raceshop L8T Build SDPC Raceshop modified L8T Block PN: SDR98759 Chevrolet Performance GEN-V L8T Crankshaft PN: 12708884 Holley Hi-Ram w/ PFI provisions PN: 300-140  Johnson Hydraulic Lifters PN: 2126LSR Callies Performance Products Ultra Rods PN: U17175 Wiseco Automotive 2618 Forged Aluminum Pistons  Total Seal Piston Rings  ATI Performance Products Balancer  Moroso Performance Products, Inc. Oil Pan PN: 21154 Peterson Fluid Systems External Oil Pump  SDPC Raceshop CNC Ported LT4 Cylinder Heads PN: SDR78973 GM Production 1.8:1 Rocker Arms w/CHE Precision Inc. Trunnions CHE Trunnion Upgrade PN: CHE4290 Holley 102mm Throttle Body  Shearer Fabrications Intercooler  Precision Turbo & Engine 7685 turbos, 46 mm wastegates, 64 mm BOVs  Hooker Blackheart Exhaust Manifolds  Maxima Racing Oils 15W-50 Break-in Oil  Brisk USA Spark Plugs With the goal in mind of showing what could be done with GM’s L8T, Scoggin-Dickey knocked it out of the park while at the same time proving that insane power can be achieved reliably using off-the-shelf parts put together with a solid game plan in mind. If you are in the market for your project give SDPC a call and they can put together a monster of your own. 

SDPC Raceshop modified L8T Block PN: SDR98759

Chevrolet Performance GEN-V L8T Crankshaft PN: 12708884

Holley Hi-Ram w/ PFI provisions PN: 300-140 

Johnson Hydraulic Lifters PN: 2126LSR

Callies Performance Products Ultra Rods PN: U17175

Wiseco Automotive 2618 Forged Aluminum Pistons 

Moroso Performance Products, Inc. Oil Pan PN: 21154

Peterson Fluid Systems External Oil Pump 

SDPC Raceshop CNC Ported LT4 Cylinder Heads PN: SDR78973

GM Production 1.8:1 Rocker Arms w/CHE Precision Inc. Trunnions

CHE Trunnion Upgrade PN: CHE4290

Precision Turbo & Engine 7685 turbos, 46 mm wastegates, 64 mm BOVs 

Maxima Racing Oils 15W-50 Break-in Oil 

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