Corvette ZR1 Engineers Code-Named the Engine BAS, For "Big-Ass Supercharger"

We know the ZR1's 755-hp monster as LT5, but the folks at Chevy affectionately know it by a different name.

Brian Williams

The new 2019 Corvette ZR1 has a big supercharger—it's so big, Chevrolet had to cut a hole in the hood to accommodate it. that Corvette engineers had a little internal codename fun with the oversize engine.

Internally, the ZR1's engine is referred to as "BAS." An anonymous engineer for the ZR1 V8—which is officially called LT5— told Autoweek that BAS stands for "Big-Ass Supercharger." We think that's appropriate.

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Apparently, the Corvette team wanted to keep their work on the ZR1 quiet within the company, which is why they used an alternate codename for the LT5. One of GM's diesel engines uses what's called a Belt Alternator System, so the Corvette team hoped people would see BAS and assume it had to do with the diesel engine, not a screaming 755-horse V8.

Of course, the BAS is no longer a secret, and it's a fascinating engine. Autoweek gets into of the LT5, and it's well worth a read. A lot of parts are carried over from the Corvette Zo6's LT4 V8, but the big-ass supercharger on the LT5 is quite different. It takes 110 hp to power spin the ZR1's supercharger, which means the LT5 is generating an effective 865 hp, according to Jordan Lee, the guy behind this motor.

So, yeah. Big-ass supercharger, indeed.

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