When putting together a plan for making four-digit horsepower, the choice for the foundation of the build has to be made between iron and aluminum. Typically, we see iron blocks being used in these situations. Concept Performance is working to change that with its LSR cast-aluminum block. This particular LSR block is being used in a twin-turbo 427 cubic inch build and will see action on the track as well as being driven on the street.
From Concept To Lightweight Monster
Concept Performance originally set out to create a cast-aluminum version of the popular iron LSX block. Since its inception, the LSR block has received several revisions to add strength and improve upon its design. Priority main oiling, provisions for six-bolt cylinder heads, thicker exterior walls, and extra bracing throughout the valley and skirt areas are all features of the current generation of LSR blocks.
The LSR includes billet 1045 steel main caps and ARP hardware. The mains are offered in either six- or eight-bolt designs, adding strength where it matters. Even with all of the additional strength built into the design of the LSR block, it weighs only 113 pounds. That’s roughly the same weight as a production LS7 block and more than 100 pounds lighter than an iron LSX block.
Making It Into The 2,000-Horsepower Club
In this video from Steve Morris Engines, Morris speaks very highly of the LSR block. He states that it is about as good as it gets for a cast block with water jackets in an LS package. Meaning that this block is a great choice for anyone looking to make big power and be able to drive it further than a quarter mile at a time. This twin-turbo 427 cubic-inch LS package definitely shows what can be achieved with the LSR aluminum block. A whopping 2,368 horsepower, and according to Morris there’s more in it that they will achieve once the engine is in the customer’s car.
This particular engine from SME features All Pro LS7 heads, a Callies crankshaft, an SME billet intake, and a pair of Harts Turbo billet ball-bearing turbos. It’s run on the Holley Dominator EFI system with dual FIC 2,150cc injectors. For the dyno pulls, the engine is being run on methanol, but will be fed pump gas for street use during drag-and-drive events. Having a lightweight 2,000-plus-horsepower package that can live on the street and set fire to the drag strip will put a smile on any hot rodder’s face.