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Supercharger Snout Porting

Camaro ZL1
Posted February 11 2014 01:36 PM by Scott Parker 
Filed under: Gm High Tech Performance Magazine, Car Engine

Camaro ZL1

Don't be shy, let's modify 

Chevrolet went to great lengths to squeeze even more power out of the Cadillac CTS-V’s LSA, but as always the factory leaves a little on the table for us hot rodders. As we have shown in the past, it is quite easy to turn the Camaro ZL1 into a 10-second missile with a mostly stock long-block. Heck, 9s aren’t even that far off if you don’t mind a little nitrous and race gas. There are even LS9 supercharger swaps. But for those of us that love OEM reliability, or just can’t bare the thought of tearing into the 6.2L with reckless abandonment, there are plenty of bolt-ons that can up the ante.

As one builder explained to me, the first place you want to start on the LSA is at the intake. The little TVS1900 supercharger is notoriously choked up on the inlet side, and uses a throttle body that is actually smaller than 90mm (unlike its naturally aspirated cousins). One of Vengeance Racing’s customers found this out the hard way. After already upgrading the cam, headers, upper and lower pulleys, and adding a methanol injection kit – there weren’t many areas left untouched. Baseline dyno pulls revealed 662-rwhp and 646 lb-ft of torque. Vengeance turned its attention to the supercharger snout first, breaking out the porting tools to open it up, smooth it out, and port match it to a Nick Williams 102mm throttle body. The results? 53-rwhp and 55 lb-ft of torque with tuning.

If you are interested in learning more about modifying a ZL1, stay tuned for a new project as we start with the basics on a bone stock LSA. 

ZL1 supercharger snout
ZL1 supercharger snout porting
ZL1 supercharger snout port matching
ZL1 supercharger snout ported & smoothed
Nick Williams 102mm throttle body
ZL1 dyno sheet


Vengeance Racing is full of a bunch of crooks. Can't believe these guys are still in business. 

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GM High-Tech Performance
GM High-Tech Performance