LM7 5.3L Engine Specs
Here in this article you will learn about the LM7 5.3L Engine Specs , Performance, Cylinder Heads, Cam Specs & More, Let’s discuss the ford LM7 5.3L Engine Specs , Valvetrain, performance, and Reviews.
The LM7 is a 5.3L Gen. 3 small block engine used in GM trucks from 1999 to 2007.
To promote it, the engine was also referred to as the Vortec 5300. This information relates to the stock engine LM7.
Mechanically, General Motors’ LS and LS-based Vortec engines ended up on nearly every branch in the GM family tree:
Chevy, Pontiac, GMC, Cadillac, Buick–heck, there was even Saab, Hummer, and Isuzu were able to get some LS admiration.
As LS and Vortec engines become popular, they’ve been the most popular performance and swap engines of the current era.
These motors are capable of producing a large amount of horsepower.
They also respond very well to upgrades, such as turbos, superchargers and intake mechanisms, cams, and nitrogen oxide.
The market for aftermarkets is robust Crate engines are widely accessible, and used motors are usually easily found in junkyards.
Summit Racing has created a collection of complete guides for every engine in the LS family of machines so that engineers and builders can find a reference to work.
This guide specifically addresses this specific engine: the Chevy L7 LS Truck engine.
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LM7 Block Specs |
|
|---|---|
| Displacement | 5.3L / 325 c.i.d. |
| Material | Iron |
| Bore Dia. | 3.780 in. |
| Stroke | 3.622 in. |
| Deck Height | 9.230-9.240 in. |
| Bore Spacing | 4.400 in. |
| Thrust Bearing Location | #3 Main |
| Main Cap Style | 6-Bolt |
| Main Housing Bore Dia. | 2.751 in. |
| Cam Housing Bore Dia. (1999-2003) | Bore 1/5 = 2.326, Bore 2/4 = 2.317, Bore 3 = 2.307 |
| Cam Housing Bore Dia. (2003-07) | Bore 1/5 = 2.346, Bore 2/4 = 2.326, Bore 3 = 2.307 |
| Cam-to-Crank Centerline | 4.914 in. |
| Casting Numbers | 12567392, 12567393, 12551358 |
LM7 Engine Ratings |
|
|---|---|
| Compression Ratio | 9.5:1 |
| Horsepower Rating | 270-295 hp |
| Torque Rating | 315-335 ft.-lbs. |
LM7 Valvetrain Specs |
|
|---|---|
| Lifter Link Style | Plastic Lifter Tray |
| Lifter Body Diameter | 0.842 in. |
| Pushrod Length | 7.385 in. |
| Rocker Arm Mounting Style | Pedestal |
| Rocker Arm Style | Die-Cast, Roller Fulcrum |
| Rocker Ratio | 1.7 |
| Rocker Offset | None |
| Valve Spring Style | Beehive |
| Valve Spring Color | Natural |
| Valve Angle | 15 Degrees |
| Intake Valve Material | Steel, Solid Stem |
| Intake Valve Dia. | 1.890 in. |
| Exhaust Valve Material | Steel, Solid Stem |
| Exhaust Valve Dia. | 1.550 in. |
| Lifter Style | Hydraulic Roller |
LM7 Rotating Assembly Specs |
|
|---|---|
| Piston Volume | +8cc |
| Wrist Pin Dia. (1999-2004) | 0.9447 in., 0.9448 in. (Pressed) |
| Wrist Pin Dia. (2005-07) | 0.9429 in., 0.9431 in (Floating) |
| Connecting Rod Material | Powdered Metal |
| Connecting Rod Style | I-Beam |
| Connecting Rod Length | 6.098 in. |
| Connecting Rod Bolts | M9 x 1 x 43 |
| Crankshaft Material | Cast Iron |
| Crankshaft Main Journal Dia. | 2.559 in. |
| Crankshaft Rod Journal Dia. | 2.100 in. |
| Reluctor Wheel | 24X |
| Flexplate Mounting Flange | 0.857 in. |
| Piston Material | Hypereutectic Cast Aluminum Alloy |
| Piston Style | Dished |
LM7 Cylinder Head Specs |
|
|---|---|
| Material | Aluminum |
| Combustion Chamber Volume | 61cc |
| Intake Port Shape | Cathedral |
| Intake Runner Volume | 200cc |
| Exhaust Port Shape | Oval |
| Exhaust Runner Volume | 70cc |
| Intake Valve Diameter | 1.890 in. |
| Exhaust Valve Diameter | 1.550 in. |
| Cylinder Head Bolt Style | Torque to Yield (TTY) |
| Cylinder Head Bolt Size (1999-2003) | (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1.25 x 45 |
| Cylinder Head Bolt Size (2004-06) | (10) M11 x 2 x 100, (5) M8 x 1.25 x 45 |
| Casting Numbers | 862, 706 |
LM7 Applications |
|||
|---|---|---|---|
| VIN 8th Digit | Year | Make | Model |
| T | 1999-2007 | Chevrolet | Silverado 1500 |
| T | 1999-2007 | GMC | Sierra 1500 |
| T | 1999-2006 | Chevrolet | Tahoe |
| T | 1999-2006 | Chevrolet | Suburban 1500 |
| T | 1999-2006 | GMC | Yukon |
| T | 1999-2006 | GMC | Yukon XL 1500 |
| T | 2002-2005 | Cadillac | Escalade (2WD) |
| T | 2002-2006 | Chevrolet | Avalanche |
| T | 2003-2007 | Chevrolet | Express |
| T | 2003-2007 | GMC | Savana |
5.3 Crate Engine And Transmission Package
Chevrolet Performance Crate Engines: For project vehicles, Chevrolet Performance provides LS engines and other crate engines. Crate engines and transmissions can be bought separately and matched.
JEGS High-Performance LS Crate Engine: The 5.3L LM7 LS crate engine from JEGS develops 460 horsepower and 425 ft.-lbs. The engine has a 3-year guarantee and may be combined with any gearbox. Blueprint Engines assembles LS engines, transmissions, and front components. Choose a torque converter, clutch assembly, and manual or automatic gearbox.
Connect & Cruise Crate Powertrain Systems: Chevrolet Performance provides combinations that produce the optimal powertrain solution without third-party tune. These kits contain a crate engine, transmission, and all the essential parts for your build.
LS Trans & Engine Packages: Pace Performance matches a gearbox with your desired LS engine. These packages eliminate component matching hassles.
LM7 5.3L Engine Overview
The LM7 Vortec 5300 is a small-block V8 GM engine that was produced from 1999 until 2013. It is a longer-stroked by 9 mm version of the Vortec 4800 and replaced the L31.
The LM7 is a 5.3L, Gen. 3 small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 5300.
The LM7 engine produced 270 hp and 315 lb⋅ft of torque. The LM7 is one of the most popular LS engines for several reasons. With iron block strength, it is a great choice for boost or nitrous.
The engine is made with both cast iron blocks (LM7) and aluminum versions (LM4 and L33). The LM7 5.3 HP engine produced 270 hp and 315 lb⋅ft of torque. The LM7 engine responds well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide.
The 5.3L LS engine family is capable of making a lot of horsepower and responds well to upgrades. The aftermarket is strong for LM7 engines, and crate engines are available. Used motors are often cheaply sourced through junkyards.
If you are looking for an LM7 engine for sale, you can check out junkyards or online marketplaces. If you are looking for a new engine, you can purchase an LM7 crate engine from various suppliers. Crate engines are available for the LM7 Vortec 5300.
You can purchase an LM7 crate engine from various suppliers. The lm7 engine upgrades respond well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide.
The aftermarket is strong, and used motors are often cheaply sourced through junkyards.
LM7 5.3L Engine Review Video
Conclusion
The LM7 5.3L engine is a popular V8 truck engine produced by General Motors from 1999 to 2007. It has a displacement of 5,327 cc (5.3 L) and produces 270 hp (201 kW) and 315 lb⋅ft (427 N⋅m) of torque. The engine is known for its iron block strength, making it a great choice for boost or nitrous. It responds well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide. For more information visit our website: Commercialvehicleinfo.com
LM7 5.3L Engine Specs FAQ
The LM7 5.3L engine is a small-block V8 GM engine that was produced from 1999 until 2007. It is primarily a truck/SUV engine that spanned both the Gen. III and Gen. IV versions of the GM LS lifespan.
The LM7 engine has a displacement of 5,327 cc (5.3 L; 325.1 cu in) from a bore and stroke of 96 mm × 92 mm (3.78 in × 3.62 in).
The 1999 LM7 engine produced 270 hp (201 kW) and 315 lb⋅ft (427 N⋅m) of torque.
The fuel type of the LM7 engine is gasoline (petrol).
The LM7 engine was produced from 1999 until 2007.
The layout of the LM7 engine is a four-stroke, V8.
The bore and stroke of the LM7 engine is 96 mm × 92 mm (3.78 in × 3.62 in).
The Vortec 5.3 is widely regarded as extremely reliable, with most engines having a lifespan within the 200k-300k mileage range.
The LM7 engine is known to have common problems such as oil consumption, lifter noise, and camshaft wear.
The LM7 engine responds well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide.
Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick—heck, even Saab, Hummer, and Isuzu got some LS love.
LM7 engines can be found for sale in junkyards or online marketplaces. Crate engines are also available from various suppliers.
The LM7 engine is one of the most popular LS engines for several reasons. With iron block strength, it is a great choice for boost or nitrous. The engine is capable of making a lot of horsepower and responds well to upgrades. The aftermarket is strong, and used motors are often cheaply sourced through junkyards
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