If you’ve ever driven a supercharged CTS-V, ZL1, or Z06, then you know exactly how much fun they are. The amount of torque they generate is incredible, as are the sounds produced. And while these cars or any supercharged vehicle is great, there’s always room for improvement.
For SEMA 2020, COMP Cams add new camshafts and complete cam packages for supercharged LS engines. Their LST (Low Shock Technology) blower cams are geared to optimize high RPM power and add boost response. These cams and packages were rigorously tested on the Spintron and dynos and made sure they could squeeze the most or of every component while guaranteeing reliability and valvetrain stability.
Billy Godbold, Valvetrain Engineering Manager of COMP Cams, said, “The LST blower grinds we just introduced were inspired from two somewhat different places. The first foundation came from when we expanded the LST Turbo cam lineup. Here, we actually used a slightly newer Low Shock profile on the newer, mid-sized offering (54-331-11) that we knew would make a bit more power. The second inspiration was from months of testing a 2650 Edelbrock blower on the 5.7L and 6.4L Hemi, with a series of cam tests that involved probably months on our dyno.”
Godbold continued, “Knowing the availability of these newer profiles from the Turbo LS, having tested the dynamics on the newest LS Turbo grind, and understanding the specifics of the LS head flow and blower options, we were quickly able to dial in on these new LS Blower grinds to fit a vast array of LS blower applications with these two camshafts,” explained Godbold. “The smaller camshaft (53-335-11) is optimized for most 4.8L & 5.3L engines and mildly modified larger engines where very smooth idle stability is important. The larger camshaft (54-337-11) works great in more highly modified 5.3L’s or any of the larger displacement rectangular or cathedral port applications.”
One of the excellent features of this package is that you can purchase them with everything you need, and all of the components are designed to work thanks to COMP. If you buy the cam kit (CK-Kit), it will include an LS roller camshaft, pushrods, dual valve springs, tool steel retainers, valve locks, spring seats, and valve seals. The master kit (MK-Kit) contains all of the above plus an added timing set and lifters. COMP also offers an optional rocker arm upgrade and LS Cam Install Kit, including all of the required gaskets, crank seal, crank bolt, and cam bolts.
COMP offers two variations of the LST blower cams. The Stage 1 cam is designed for a smaller 5.3-liter mildly modified engine with a blower and works best between 2,000-7,200 RPM. The Stage 2 camshaft was crafted for an LS engine with more significant displacement or a larger blower. This cam is happy in the 2,300-7,400 RPM range and offers more duration than the Stage 1 cam.
We were curious about which of these cams would work better with the LSA blower. Goldbold said, “The LSA engine uses a smaller 1.9-liter supercharger, so it would typically be better with the reduced overlap of the smaller 54-335-11 cam, even with a larger displacement engine to feed. We tested several configurations while developing these camshafts, and it was outstanding how well both performed in almost any system. The most significant difference is the 54-335-11 is better below 4000 RPM, where the 54-337-11 has a racier idle, and the added duration shows in gains past 6000 RPM. You would be hard-pressed to find an LS blower application where these would not be a good fit.”
When it comes to power numbers, Godbold said they’d seen gains up to 850-plus horsepower on a 6.2-liter LS and 806-plus horsepower on a 5.3-liter LS when using the Stage-2 54-337-11 camshaft paired with an Edelbrock 2300 TVS Supercharger.
For more information on the LST blower cam packages from COMP and other exciting products, check out their website.