Chevy LS series engines: LS1, LS2, LS6, LS7, LSX

Late model Chevy small block engines for large displacement, low weight and high performance.

The theme here is big displacement in a small-block made of aluminum, re-engineered with modern technology and race driven design. These are the ultimate high performance engine swaps for the older generations of Camaros. They reduce weight and add horsepower. See CamaroTech photos of a BMR Fabrication/Hawk front cross member which has mounts for these engines.

LSX swap kits for the first, second and third generation Camaros are available from Spohn or BRP. The kit includes engine mounts (to permit this swap with the stock cross member) and a rear transmission cross member and mount. A compatible oil pan (Cadillac CTS-V) is also available if required. See below for more information on LS series engine swaps.

Thanks to Turnkey Engine Supply for letting us tour their facility and take photos. Turnkey specializes in the assembly of LS series engines using new GM and aftermarket components.


LS Gen III small-block: The Chevrolet LS1 and LS6 series engine was the third generation of Chevy small-blocks and was first introduced as the LS1 in the 1997 Corvette and was also used in the 1998-2002 Camaro Z28. Variants of this engine are available in displacements of 293 cid (4.8L), 325 cid (5.3L), 346 cid (5.7L) and 364 cid (6L). The LS6 was introduced in the 2001 Corvette Z06 option package.

LS Gen IV small-block: The LS2 series engine was introduced in the 2005 Corvette and the LS7 became available as an option for the 2006 Corvette. The LS2 and LS7 are known as the Gen IV small-block Chevy engines.

Comparison of engine specs:
LS SeriesDisplacementHorsepower
/Torque
Cam DurationCam deg intake/exhaustCam liftValve diameterRocker Arm rationCompression RatioBoreStroke
LS1346 cid/5.7L350/3650.050 in200/203.500/.5002.00/1.551.710.25:13.8983.622
LS6346 cid/5.7L405/4000.050 in204/211.525/.5252.00/1.551.710.50:13.8983.622
LS2364 cid/6.0L4000.050 in200/203.500/.5002.00/1.551.710.9:14.03.622
LS7427 cid/7.0L505/4700.050 in211/230.591/.5912.20/1.611.7 or 1.8:111.0:14.1254.0


Historical note: The Chevy Gen I small-block is the 1955-2004 Chevy engine design used in Gen 1, 2 and 3 Camaros. The Gen II "LT" engine was used in the 1992-1996 Corvette and 1993-1997 Camaro Z28.


LS Design features:

LS1 design features: The LS2 (introduced in 2004) and LS7 (2006+ Corvette) are considered to be the Gen IV small-block design.

LS7 design features:

LS Design Features:

Chevy Aluminum Block:
Steel sleeves:

The photo to the right is of the standard LS aluminum block with steel sleeves. Pictured below is the new cast iron LSX block with six head bolts per cylinder vs the standard four. Block fits 4 and 6 bolt circle heads.

Six bolt bearing caps:

  • Two vertical studs
  • Two vertical bolts
  • Two transverse bolts

This race proven design was adapted to the Chevy small-block to introduce greater rigidity and block stability. The previous generation of Chevy small-block often employed stud girdles in race motors to add stability and stiffness.

This is also a sneak peek at one of the first releases of the cast iron LSX blocks with more bore (4.25 in max) and stroke (4.5 in max) and six head bolts (vs 4) circling each cylinder for more clamping pressure. That's 480 cid from a small block!!

Oil pan which provides structural rigidity:

Generic all purpose unit on the left.
Corvette unit on the right.

LS fuel injection: LS1, LS2, LS7, Ram
LS ignition coils: one per cylinder

This allows more time for coil saturation as the coil must saturate once every two revolutions. With the older single coil design, the coil will provide current for discharge four times per revolution.

An optical crank trigger replaces the traditional distributer.


Turnkey Engine Supply: LS engines can be assembled to order. They typically use GM blocks, heads and components as well as Mahle forged pistons, carbon fiber intakes and other improvements. They can also fit your engine with a transmission adapter plate to fit GM TH400, TH350 and 700R4 automatic transmissions. (note: current automatic tranny is the 4L65 4sp) The proper bell housing should mate the engine bolt pattern to manual transmissions. More radical supercharged and turbo charged assemblies are shown below.


World Products LSX Warhawk Aluminum Blocks/Castings:

Warhawk product sheet


LS series replacement engine sleaves:

Darton Sleeves manufactures performance "wet" sleeves which replace both the portion of the LS engine casting which holds the sleeve and LS engine sleeve itself. By removing the engine block's iron sleeve casing, the Darton sleeve provides the structure and is in direct contact with the cooling water (thus it's a wet sleeve). The MID (Modular Integrated Deck) design allows for the sleeves to "siamese" to create a solid deck of sleeve flanges, reinforcing the upper deck area. This sleeve enables one to go beyond the GM bore sizes up to 4.2 inches.
The M.I.D. sleeves are designed to work with Cometic gasket seals.

Darton manufactures both wet (all purpose) and dry sleeves (drag strip only).

Darton Sleeves


L.A.Sleeves for LSx series engine shown. Sleeves available for all makes and models.
Moly2000 centrifugally spun-cast ductile chrome-moly iron. Hard, dense and strong for race and performance applications. Sante Fe Springs CA (800)822-6005


LS series engine swaps:

When swaping an LS series engine into an earlier generation Camaro, consider the following:


Links:


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