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Chevy LS7 Engine Specs

Here in this article you will learn About the Chevy LS7 Engine Specs , Performance,  Cylinder Heads, Cam Specs & More, Let’s discuss the Chevy LS7 Engine Specs  , Valvetrain, performance, and Reviews.

The LS7 has the largest displacement of any engine in the LS series. It is Noteworthy since it was developed with the same racing Engine as the C5-R Le Mans Corvette. It was Purposefully developed for maximum performance.

General Motors’ lS and LS-Based vortec Engines were used in a variety of GM models, including chevrolet, Pontiac, gMC, Cadillac, and Buick. Furthermore, The engines were Popular with other manufacturers such as Saab, hummer, and isuzu.

These engines have a high horsepower output and Respond well to improvements such as turbos, superchargers or turbos, intake systems, cams, and nitrogen oxide. The aftermarket is thriving, crate engines are widely available, and old motors may be Bought cheaply from Junkyards.

Also Check Here: Isuzu n series specifications

Chevy LS7 Engine Specs

Chevy  LS7 Engine Block Specs

Displacement 7.0L / 427 c.i.d.
Material 319-T7 aluminum
Deck Height 9.240 in.
Cylinder Liners Pressed in, 5.850 in. long (vs. standard 5.500 in.) to support longer stroke
Bore Dia. 4.125 in.
Stroke 4.000 in.
Bore Spacing 4.400 in.
Thrust Bearing Location #3 Main
Main Cap Style Doweled, 6-bolt, billet steel (1141 alloy)
Main Housing Bore Dia. 2.751 in.
Cam Housing Bore Dia. Bore 1/5 = 2.346 in.
Bore 2/4 = 2.326 in.
Bore 3 = 2.307 in.
Piston Oil Squirters Yes
Cam-to-Crank Centerline 4.914 in.
Casting Number 12598723

Engine Ratings

Compression Ratio 11:1
Horsepower Rating 505 hp @ 6,300 rpm
Torque Rating 470-481 ft./lbs. @ 4,800 rpm
Engine Weight 454 lbs. (assembled with clutch, flywheel, balancer, and water pump)

LS7 Cam Specifications

Cam Gear Poles 4X
Duration @ .050 in. (int./exh.) 210°/230°
Lobe Separation 120°
Cam Advance -3 degrees
Cam Gear Attachment 3-bolt
Valve Lift 0.593 in./0.589 in
Camshaft Part Number 12638426

LS6 Valvetrain Specs

Valve Spring Style Beehive (LS7 specific)
Timing Chain Part Number 12646386 (single row chain)
Lifter Body Diameter 0.842 in.
Pushrod Length 7.750 in.
Pushrod Dia. 0.375 in.
Rocker Arm Mounting Style Pedestal
Rocker Arm Style Die-Cast, Roller Fulcrum
Rocker Ratio 1.8
Rocker Offset Intake only, 9mm total offset
Exhaust Valve Dia. 1.610 in.
Valve Spring Color Natural
Valve Spring Seat Pressure 100 lbs. @ 1.960 in. installed height
Valve Spring Open Pressure 310 lbs. @ 1.370 in. open height
Valve Angle 12 Degrees
Intake Valve Material Titanium, hollow stem (chrome nitride PVD coated)
Intake Valve Dia. 2.205 in.
Intake Valve Weight 77 grams
Exhaust Valve Material Stainless steel (sodium filled)
Lifter Link Style Plastic Lifter Tray
Exhaust Valve Weight 74 grams
Timing Chain Part Number 12646386 (single row chain)
Timing Chain Guide Style. Plastic Wedge Shaped Damper
Lifter Style Hydraulic roller (with ceramic check ball for high rpm operation)

LS7 Cylinder Head Specs

Casting Number 12578452
Material 356-T6 Aluminum
Combustion Chamber Volume 70cc, CNC-ported
Intake Port Shape Raised square port, CNC-ported
Intake Runner Volume 259cc
Exhaust Port Shape D-port, CNC-ported
Exhaust Runner Volume 86cc
Valve Seat Material PMF 28 / Brico 3220
Cylinder Head Bolt Style Torque to Yield (TTY)
Cylinder Head Bolt Size (10) M11 x 2 x 100, (5) M8 x 1.25 x 45

LS7 Rotating Assembly Specs

Piston Material M142 cast aluminum alloy (with anti-friction coating and anodized top ring groove)
Piston Style Flat top, with valve reliefs
Piston Volume +7cc
Wrist Pin Dia. 0.925 in. (Full Floating)
Rod Part Numbers
12586258, 126318172, 12661677
Connecting Rod Material Titanium
Connecting Rod Style I-beam, with tapered small end
Connecting Rod Length 6.067 in.
Connecting Rod Housing Bore 2.225 in.
Connecting Rod Bolts M9 x 1 x 40
Connecting Rod Weight 464 grams
Crankshaft Material Forged 4140 steel (early), Forged 44MNSIVS steel (late)
Crankshaft Part Numbers 12611649 (2006-11),
12641692 (2012-15)
Crankshaft Weight 56.40-57.65 lbs.
Crankshaft Main Journal Dia. 2.559 in.
Crankshaft Rod Journal Dia. 2.100 in.
Reluctor Wheel 58X

LS7 Applications

VIN 8th Digit Year Make Model
E 2006-13 Chevrolet Corvette Z06 and
Corvette 427 (2013)
E 2014-15 Chevrolet Camaro Z/28

Chevy LS7 Engine Specs Review

The Chevy LS7 engine is a high-performance variant of the Gen IV LS1 engine that was developed by General Motors.

It was first introduced in the 2006 Chevrolet Corvette Z06 and was also used in the Chevrolet Camaro Z/28 and the Cadillac CTS-V. The LS7 is known for its impressive power output and high-revving capabilities.

Full review YouTube video check here.


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Chevy LS7 Engine Specs FAQ

What makes the LS7 special?

The LS7 was famous for its efficiency, creating vast torque blocks within a compact block.

It also had a better power-to-weight ratio, as it was compact, light, and much superior to the initial 427s.

How much power can you get out of an LS7?

It’s safe to build as much as 1,000 horsepower with the block from the factory, but a naturally-aspirated build isn’t likely to test the limits.

If you’re looking to increase some security towards that point, you will do better to purchase forged pistons once you’ve hit 700 horsepower.

Why did Chevy discontinue the LS7?

GM has been gradually phasing the Gen III LS crate engines since 2019. to allow room for crate versions of older Gen IV LS and Gen V small blocks in the LT-series, Muscle Cars & Trucks said.

Chevy has also announced the end of the LT5 crate motor–the largest and most efficient GM production engine after only one year of being available.

How do I get more power out of my LS7?

The intake manifold for the LS7 and throttle body are great for the stock engine. If you’re looking for more power, it is necessary to provide the engine with more excellent air.

The large cam and flowing heads restrict the factory intake. An Aftermarket Intake Manifold will be the best option.

Is LS7 a big block?

in. To clarify the meaning of LS7, it can also mean a 454 cubic-inches Big Block V8 with an output of 460 horsepower.

This was featured in legendary GM muscle cars in the 1970s, such as Chevrolet Caprice, Chevrolet Caprice, Chevelle, Corvette, El Camino, Monte Carlo, and GMC Sprint.

How much horsepower does a supercharged LS7 have?

This engine produces 1100plus horses and 1050 lbs of torque, ensuring your street car’s performance is unparalleled.

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