Bigger is better. Period. Matt and Shane Corish certainly embraced that idea by bringing the first commercially available 12-cylinder LS engine to the 2016 SEMA show. While stroker cranks and cylinder over-bores are the most commonplace ways to bolster the brawn of a motor, Matt and Shane skipped that step entirely and went straight to adding more cylinders. Their scratch-built 12-cylinder LS began life as two LS1 blocks that were treated to a chop and weld. Courtesy of the extra cylinders, the V12 now displaces a whopping 519ci and that's with a factory LS1 bore and stroke of 3.898-inches and 3.62-inches.
The fact that a running 12-cylinder LS is a thing is cool, but this isn't some one-off Frankenstein. Matt and Shane own V12LS.com and are using SEMA as a springboard to launch their latest product, a custom V12 LS block casting. The original welded block you see here is actually a development mule paving the way for bigger, better things to come.
"We're going to go into production and start casting these blocks very shortly, " said Shane. "When we start, we won't have any question about strength and we would love to see some people push 20psi of boost and get up to the 2,000 horsepower mark."
Shane says the cast blocks will have the option of larger (4.00-inch-plus) bores and potentially utilize an LS3-style cylinder head. Some quick math reveals that a 4.125-inch bore and just a hint more stroke (3.75-inch) would let the V12 tip the scales at 601ci. Being that the engine already produces a hearty 717 horsepower with a very conservative cam, we can't even imaging would the extra cubes or a bit of boost would bring to the table. "These are torque monsters," said Matt. "It's making 400lb-ft at 2,000 rpm.
So how do you build a V12 out of a V8? According to Shane, it isn't as bad as one might suspect. "The crankshaft and camshaft are completely custom (billet pieces) but the rest of it is pretty interchangeable with LS parts," said Shane. The engine uses factory style pistons, rods, bearings, valvetrain, etc. Aside from the extra 4 holes, it's still an LS.
The V12 is nestled in the engine bay of a '67 Camaro built by Quality Custom Rides. "They basically built the car around the engine," said Shane. In its current configuration, the V12 sports a set of 1.5-inch individual throttle bodies and massive 6-into-1 headers built by Stainless Steel Headers Corporation. The car is still in the build stage but is on track to be just as eye-catching as the engine.
Deposits are currently being accepted for the V12, which will retail for $35,000, and Matt says they will start shipping mid-2017. "It's not the cheapest 717 horsepower but it's definitely the coolest!" That is a point we'd have a hard time arguing