LM7 5.3L Engine Specs: Performance, Cylinder Heads & More

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.

LM7 5.3L Engine Specs

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

LM7 5.3L Engine Specs Review Video

LM7 5.3L Engine Specs FAQ

How much HP does a 5.3 LM7 have?

Test on the dyno using a FAST-managed system along with long-tube headers.

With no accessories. The standard 5.3L engine produced 348 horsepower when running at 5,600 rpm and 376 pounds of torque at 4,400 rpm.

Is the LM7 5.3 a good engine?

The LM7 is among the most well-known LS engines due to several reasons.

Its iron block strength is an excellent option for boost or Nitrous applications. GM created a huge number of these over eight years. A large number of LM7 engines on the market keep prices low.

Which LS engine is best for turbo?

“All engine types work fantastic with a turbo; however, those with 5.3 and 6.0-liter engines tend to be the most well-known.

The 5.3 is the least expensive and simplest to locate, which is why you’ll find many people who use it. With the 5.3 and 6.0, you can get as much as 1,000 horsepower with the stock motor when you press them.

What year did the LM7 come in?

The LM7 was introduced during the year 1999. It was available in GM pickups, vans, and SUVs from 1999 until 2007.

The LM7 was a 5.3L engine referred to as the Vortec 5300.