MILFORD, MI – With several months of engineering work remaining on the ’15 Chevrolet Corvette Z06, the sports car already owns the fastest lap at the General Motors Proving Ground. In the coming weeks, more records are expected to fall when it travels to Germany’s fabled Nurburgring for testing.

The supercharged, 638-hp Corvette ZR1 owns GM’s quickest turn of “The ’Ring,” posting a 7:19.63 in 2012. That’s about 3.5 seconds ahead of the previous-generation Z06, which still commands a top-15 time at the track from 2011.

But the redesigned ’15 Z06 boasts an all-new 650-hp 6.2L LT4 V-8, which like the ZR1 with its 6.2L LS9 V-8 uses an Eaton Roots-type blower for added power over base-model Corvettes.

Jordan Lee, chief engineer and program manager for the small-block V-8 at GM, says the LT4 crushes the performance benchmark set by the LS9.

“The LT4 makes the ZR1 feel sluggish,” Lee says during a recent backgrounder on the engine here. “It’s brutal in a raw sense, but a thrill.”

The LT4’s calling card is maximum power almost instantly. The engine, based on the fifth-generation small-block LT1 6.2L V-8 architecture powering the ’14 Corvette Stingray, makes 457 lb.-ft. (619 Nm) of torque just off idle, Lee says, and 625 lb.-ft. (847 Nm) at a scant 2,800 rpm.

The LT4 also maintains 90% of its peak torque, or 592 lb.-ft. (802 Nm), from 2,500 to 5,400 rpm. The full brunt of the LT4’s 650 lb.-ft. (881 Nm) of thrust comes at 3,600 rpm and gives it nearly 8% greater peak grunt than the ZR1.

GM has not published a top speed for the Z06, but given the power output it would almost certainly exceed the 205 mph (330 km/h) of the ZR1. GM has said the ’15 Z06 with its new 8-speed automatic will do 0-60 mph (97 km/h) in 3.7 seconds and cover the quarter-mile (0.4 km) in 11.9 seconds, clear evidence this engine indeed is loaded with low-end torque.