Even the LS9 valve covers must be used because the alternator ... There’s probably 20 hp or more to be realized with a larger throttle body. See All 25 Photos 18.The engine uses Injector ...

Run on the dyno with the stock cam, long-tube headers, and no accessories, the 5.3L produced 342 hp at 5,300 rpm and 373 lb-ft of torque at 3,900 rpm. After installation of the LS9 cam and LS3 ...

It's not every day you get to hand-build a 638 HP LS9 engine that'll slip under the hood of a Corvette ZR1. Yesterday was one of those days. Here's how the magic is made. Yesterday we drove over ...

The LS9's output is nearly 103 horses per liter ... The Corvette ZR1 goes on sale this summer. Its 638-hp supercharged engine is complemented in the chassis by heavy-duty components not offered ...

The one that makes 638 hp and 604 lb-ft. Yes, some lunatic thought it was a good idea to put an LS9 in a late-'90s Tahoe. I'd like to meet this lunatic and buy them a beer. Welcome to You Must Buy ...

Ultimately, the Corvette ZR1 LS9 produces an additional 58 horsepower compared to the Camaro ZL1's LSA and 82 hp more than the Cadillac CTS-V. The LS9 carries a similar advantage over the LSA when ...

More strength was added to the LS3 block (which helped handle the power from the supercharged LS9 for the ZR1 Vette). The Pontiac G8 GXP also received the LS3 (415 hp). In 2010, the relaunched ...