Dyno Tests

CPR Takes us Through Building a 550 HP Street 383 Stroker LS

On the dyno, this mild 10.8:1 compression 383 made an excellent 556hp with nearly 530 lb.-ft of torque. When you can make 1.45 hp/ci – that’s some power.

By Jeff Smith/Photos By Jeff Smith and CPR-Engines It seems that the only engines that get any media exposure anymore in the popular media are 1,000-plus horsepower “street” engines. The problem with those big-power stories is that they do not represent what’s really going on. A turbo motor that can make 2,000 hp isn’t what the average street guy is ... Read More »

Better With Boost: Vortech Your LS

Are you looking for BIG TIME power gains? Look no further than a Vortech supercharger!

There are many routes to increased performance. If we start with a stock motor, you can always upgrade the existing combination with a top-end kit featuring heads, cam and intake. If you want more, you can also increase the displacement of the short block. Of course there is always nitrous oxide, but if you are looking for serious power gains, ... Read More »

Blown Away: Supercharged LS Cam Comparison


By Richard Holdener Cam swaps for LS motors are always exciting because nothing wakes up an LS like wilder cam timing. We have seen 50, 60, and even 70 horsepower gains from a simple cam swap on an otherwise stock LS application. The gains have been even greater on modified motors. The reason for this is that LS motors already ... Read More »

Off Your Rocker

The factory LS roller fulcrum rockers are good, but full rollers are even better.

To illustrate the gains offered by upgrading the factory rockers, we ran a back-to-back test using the stock rockers and a set of 1.72-ratio, aluminum roller rockers from COMP Cams. Read More »