The LS7, which debuted in the Corvette C6 Z06, is now available as a 570-hp crate motor.
It's tough making big power from a naturally aspirated pushrod engine.
That's not to say that it can't be done, of course; to this day, NASCAR engines all follow a cam-in-block, V8 configuration, and they generate plenty of thrust. But horsepower is a function of both torque and rotational speed - the faster the engine spins, generally speaking, the more power it makes - and pushrod valvetrains don't like to spin like overhead-cam ones do.
That's what makes the big, burly 7.0L Chevy LS7 such a big deal. With a relatively high 7,000-rpm redline, the LS7 was rated at 505 peak horsepower in the Chevrolet Corvette C6 Z06 and fifth-gen Camaro Z/28, making it remarkably power-dense for its time. In terms of outright grunt, it's still more potent than the C8's LT2 V8.
But Chevrolet has since utterly outdone itself, revamping the LS7 with a simpler wet-sump lubrication system and a high-lift camshaft. That latter modification contributes to a whopping 65-horsepower increase at peak, for a total output of 570 horsepower - better than 80 horsepower per liter. The result - what Chevrolet has dubbed the "LS427/570" after its cubic-inch displacement and horsepower rating - is now on sale as a crate motor through the Chevrolet Performance catalog.
"The all-new LS427/570 builds on the legendary, racing-bred performance of the LS7 to create the most powerful naturally-aspirated LS crate engine in our portfolio," says GM's Specialist Marketing Group Manager, Jessica Earl.
While the LS427/570's new high-lift hydraulic roller camshaft is, indisputably, its party piece, the high-performance crate motor features a number of other highlights. Those include unique high-rate valve springs, a dependable rotating assembly with a forged steel crankshaft and titanium connecting rods, and CNC-ported cylinder heads with big, 2.2-inch titanium intake valves and 1.6-inch sodium-filled exhaust valves.
We don't yet know pricing on the new motor, but considering the original LS7 crate motor sells for around $11,000 at some retailers, we can safely assume it will start north of ten grand. Get your checkbook ready.