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LS Engine Power Packages - A New Generation Of Performance

LS1/LS2 Power Recipes

By Richard Holdener, Photography by Richard Holdener

Spec Sheet 500hp LS2
The CNC-ported AFR 205 heads were a big part of why this LS2 produced such big power. Combining the free-flowing heads with a custom AFR-spec cam resulted in 571 hp and 500 lb-ft of torque.

BlockStock 2003 LS2
CrankStock 2003 LS2 (Stock Stroke)
RodsStock 2003 LS2
PistonsStock 2003 LS2
Compression10.9:1
Cylinder HeadsAFR 205S
CamCustom AFR
Lift.575 In./.585 Ex.
Duration230 In., 232 Ex.
Intake ManifoldStock 2003 LS2
Throttle BodyStock 2003 LS2
Injectors36 lb.
Management SystemFAST
HeadersHooker 1 5/8
Exhaust18-IN. Collector Extension
Fuel(91-Octane Rocket-Brand Race Gas)

Like the smaller LS1, the 6.0L LS2 responded just as well to modifications. By equipping the LS2 crate motor with a set of AFR 205 heads, a custom AFR cam profile, and an LSX (90mm) intake, the power numbers reached 571 hp and 500 lb-ft of torque. Remember that the LS2 motors sport the better LS6 heads (243 castings), so additional power from aftermarket heads is more difficult to come by than with the smaller LS1. With 571 hp, this is one serious normally aspirated street motor.

Spec Sheet 600hp LS1
It's obviously possible to exceed 600 flywheel horsepower with a normally aspirated LS1, but life is so much easier with forced induction. Rather than go the wild cam, high-compression, or even large-displacement route, simply adding a supercharger to an otherwise mild LS1 will result in some serious power. Exceeding 600 flywheel horsepower is no problem; in fact, this modified LS1 managed to exceed 600 wheel horsepower (closer to 700 at the flywheel) running just 10 psi of boost. Credit the efficiency and power potential of the Kenne Bell twin-screw supercharger for the impressive power. The test motor featured a 5.7L LS1 short-block equipped with LS6 heads and cam. The motor exhaled through the stock LS6 titanium exhaust. Run on the Dynojet chassis dyno, the Kenne Bell supercharged Vette produced 600 wheel horsepower and 658 lb-ft of torque. How does 500 lb-ft of torque at just 2,000 rpm sound? If you put your foot in this bad boy's throttle, you'd better be sure the wheels are pointed in the right direction.

BlockStock 1998 LS1
CrankStock 1998 LS1 (Stock Stroke)
RodsStock 1998 LS1
PistonsStock 1998 LS1
Compression10.2:1
Cylinder HeadsStock LS6 (+2cc Chambers Compared To LS1)
CamStock LS6
Lift.555/.551
Duration204 In., 218 Ex.
Intake ManifoldKenne Bell Blower
Throttle BodyStock LS1
Injectors42 lb.
Management SystemKB System Custom Chip
HeadersStock LS6 Ex Manifolds

Adding a Kenne Bell supercharger kit to your C5 or C5 Corvette is a surefire recipe for performance. Running the kit on an LS6-enhanced LS1 resulted in 600 wheel horsepower. Adding the same kit (with more boost) to a 408 stroker version resulted in 800 wheel horsepower.

By Richard Holdener
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