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.
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) |
| Connecting 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 Video
Conclusion
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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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