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Chevrolet and GM Performance Parts - Chevrolet “Gen 3 And Gen 4 Design” LS1 - LS2 - LS6 - LQ4 Engine Parts
Chevrolet and GM Performance Parts - GM “GEN 3 AND GEN 4” DESIGN LS1 - LS2 - LS6 - LQ4
This page is dedicated to the “Gen 3” engine design which is not compatible with traditional GM engines. All of the GMPP “Gen 3” parts listed in the 2003 GM Performance Parts catalog are listed on this page and we will continue to add more parts as GM adds them to their catalog. GMPP shows the LS1 (LS-1) crate engine and some of the LS6 (LS-6) parts in their catalog. Nothing on the LQ4 of note yet. The LS2 crate engine is now available but not in their 2004 catalog. The LS2 engine is replacing the LS6 factory production engine so the factory production LS6 engine will not be available any longer after the end of November 2004 from what GM says. All the other LS6 crate engines and parts will still be available though.
Keys - scperformanceeng, gmperformanceeng, or gmgoodwrencheng for SC, GM, or Goodwrench engines. Use allengine for a complete list of all three.
Updated 05-05-2006.
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GM and Chevrolet and GM Performance Parts part prices are in the Price & Parts search. Enter a Key, part number, GM, SC, or a key word, like 502, into the Price & Parts search. Use GM for a list of both GM and GMPP parts and SC for a list of all Chevrolet and GM Performance Parts parts. Aftermarket company prices are on downloadable Price Sheets or on their pages. The Page Search is for searching the pages of our Web site. More information on this is on our help page.
We have more GM and Chevrolet and GM Performance Parts Performance Engines available.
“GEN 3” DESIGN LS1 - LS2 - LS6 - LQ4
The Gen 3 engine design is not compatible with traditional GM engines. Only parts designed for
the Gen 3 engines will work on any of the Gen 3 engines. Gen 3 heads for the LS1 or any other Gen 3 engine parts will work on any
Gen 3 block including the Big-Block Gen 3 block. For this reason, we at Chevrolet and GM Performance Parts have made this separate section on our
web site dedicated to only the Gen 3 engine design.
Type the part number in the Price Search for price.
This is the state of the art setup for your hotrod (320 HP and 345 Torque). This (F-Car) Camaro/Firebird LS1
engine kit includes the LS1 engine complete with fuel injectors, exhaust manifolds, and flex plate. The engine
features an aluminum block and cylinder heads with 10.25:1 compression ratio. The engine kit is supplied with ECM,
and wire harness that allows this engine to be installed with a four-speed automatic transmission (4L60E) in any
1975 or earlier vehicle.
12498399 LS6 Service Stock Replacement Long-Block with Corvette Oil Pan and Camaro Oil Pan Kit
This is a long-block stock replacement engine for a 2001-04 corvette RPO LS6 with 5.7L. This long-block includes the Corvette
oil pan installed and for Camaro applications requires a change to the Camaro pan using the Camaro oil pan kit which is also included. Technical Notes:
This engine assembly includes an aluminum block, aluminum heads, crankshaft, rods, pistons,
valve train, camshaft, valve covers, and an oil pan.
It does not include intake manifold, exhaust manifolds, balancer, flywheel, throttle body, or any electronics.
“Emission legal for Corvette LS6 option only.”
12578104 - 2004 Factory Production LS6 Corvette Engine
This is a long block for a 2001 385 HP and 2002 through 2004 405 HP Corvette RPO LS6 5.7L. This production engine includes
an aluminum block, aluminum heads, crankshaft, rods, pistons, valve train, camshaft, valve covers, oil pan, intake manifold,
throttle body, exhaust manifolds, balancer, and flywheel. It does not include any electronics.
(Now discontinued and replaced by the LS2 factory production engine.)
The LS2 is the new factory engine for the model year
2005 Corvette and replaces the LS-6 factory production engine.
The 2005 Corvette features the new 6.0L V-8 LS2 engine based on GM’s Gen IV small-block family. The LS2 is the most powerful standard small-block engine ever offered in Corvette.
Brackets, wiring harnesses, and computers for the LS1, LS2, LS6 and LQ4 can be obtained from Street & Performance.
Street & Performance, Inc.
#1 Hot Rod Lane - Mena, AR 71953
http://www.hotrodlane.cc/
The “Gen 3” V8 (RPO-LS1) engine is used in all 1997 and later Corvettes, and 1998 and later Camaros.
A special manifold must be fabricated to use this head. Use with special cylinder block P/N 12480030. These discontinued cylinder
heads are the same as P/N 12480090 except for the following:
• The chamber volume for the discontinued P/N 12480005 head is 38cc with flat faced valves of .75mm inlet and 1.5mm exhaust margins. P/N 12480090
provides additional material over discontinued P/N 12480005 for CNC porting and chamber shaping and starts at a volume of less than 30cc’s. Technical Note: Replaced by P/N 12480090 cylinder head.
The “Gen 3” V8 (RPO-LS1) engine is used in all 1997 and later Corvettes, and 1998 and later Camaros.
A special manifold must be fabricated to use this head. Use with special cylinder block P/N 12480030. To compete
successfully in GT-2 racing an aftermarket parts development started with the intent of providing the new GM
powertrain LS1 engine a higher performance platform. The first component designed was the cylinder head with an
intent to provide a part that was similar to the LS1 in appearance for sanctioning body approval. The cylinder
heads include the following features:
• The basic height, width and attachment faces are in stock location to dowel and deck position.
• All dimensions and fasteners are metric.
• The basic valve angle was revised from 15 to 11 degrees to produce a smaller chamber.
• The valve angle also provides more space for aftermarket rocker arms. Jesel valve train systems has provided the current race pieces. The
production individual pedestals are cast into a continuous feature tieing all the bosses together.
• The rocker cover hold down bosses are incorporated into the rocker arm plateau for the 4-bolt center hold down type cover (1999 model year).
• The chamber volume for the discontinued P/N 12480005 head is 38cc with flat faced valves of .75mm inlet and 1.5mm exhaust margins. P/N 12480090
provides additional material over discontinued P/N 12480005 for CNC porting and chamber shaping and starts at a volume of less than 30cc’s.
• The inlet port roof and floor is raised and the attachment pattern is designed for a Kinsler fuel injection manifold.
• Inlet port is 57.15 x 36.58mm / 55.957mm dia. precision finished.
• The cylinder head is machined for larger diameter springs (41.5mm or 1.63” dia. machined pocket).
• The exhaust flange is identical with the production part. The exhaust port is stock size.
• The head is machined for a 12.712 / 12.688mm dia. valve guide bore.
• Rocker cover oil rail seal is a reverse tapered groove for a 3.2mm dia. (.125”) free length “O” Ring.
This cylinder head starts with the production LS6 cylinder head and is then CNC ported for maximum flow.
It is the cylinder head of choice for Corvette showroom stock road racing. With this cylinder head and the
ASA camshaft, Gen 3 engines can approach 500 horsepower in racing applications. This cylinder head includes
production LS6 valve springs and valves. Technical Notes: These ported heads are race only. Not for street usage.
12564824 Aluminum Head Assembly, 2002-2003 RPO LS6
This cylinder head is used on 2002 Corvettes with 405 HP RPO LS6. The LS6 cylinder head can be used on any
Gen 3 design V8 block. This LS6 head is emission legal on the 2002-2003 Corvette only.
The casting number is 12564243.
It includes the following items:
• 12564825 Head - Bare
• 12565313 Valve Spring
• 10166344 Cap, Valve Spring, capable of .550” lift cam
• 12565311 Valve, Intake, light weight
• 12565312 Valve, Exhaust, light weight, sodium filled, hollow stem
• 10166345 Key, Valve Stem
• 12482063 Oil Seal, Intake
• 12482062 Oil Seal, Exhaust
SBC LS6 “Gen 3” Performance Cylinder Head. Bear Head version of P/N 12564824.
This cylinder head debuted on the 2001 LS6 Vortec engine. It offers the same overall package configuration as LS1 cylinder heads. However, the
combustion chamber has been downsized approximately 3cc for more compression. Also, the exhaust port has been redesigned and features a raised
floor and smaller port volume. This head is characterized by a “D” shaped exhaust opening at the exhaust flange. [Old P/N 12560808]
BARE BLOCKS
12480030 Block, Gen 3 Aluminum Siamesed Bore Racing Block
This is the same block that was used in the LeMans 24 hour endurance racing C5R Corvettes, and is intended
for maximum effort competition engines. This block has the same production external dimensions and bosses,
but the primary difference between this block and the Gen 3 production blocks is a siamesed water jacket,
which allows engine builders to build engines with larger bore sizes. The delivered, pre hone, bore size
is 4.117”, and the maximum finished bore size recommended with this block is 4.160”. Cylinder
deck height is 9.240”. This block uses a dry, pressed-in liner similar to other GM racing aluminum
small blocks. Steel billet bearing caps are fitted to the block. This block features wet sump style oiling
and is made from high strength A356 aluminum that utilizes a modified T7 heat treat. Production Gen 3 style
cylinder heads may be used on this block; however, for maximum performance, P/N 12480090 Gen 3 racing cylinder
heads should be used.
This aluminum block is used on the 2001 LS6 Corvette. 4.00” (99.00 mm) Bore. Technical Note: Uses casting P/N 12561168.
12551366 “Gen 3” 6.0L Pick-Up Truck Bare Block (Big-Block)
--
This “Gen 3” cast iron 6.0L block is used on 1998-2001 pickup trucks. 3.98” (101.60 mm) Bore. Technical Note: Uses casting P/N’s 12551364, 12573581, or 12577184. All Gen 3 parts will fit this block.
12568950 “Gen 4” 6.0L Corvette LS2 Bare Block
--
This “Gen 4” aluminum 6.0L block is used on 2005 C6 Corvette LS2 engines. All-new 319-T5 Aluminum, 4.00" bore cylinders. Use this aluminum cylinder block as the starting point for a big-inch custom street or competition engine. Many Gen III (LS1/LS6) components, including cylinder heads and reciprocating parts, can be used.
CAMSHAFTS
12560950 LS6 “Gen 3” Production Performance Camshaft
--
This camshaft is original equipment in LS6 Vortec engines. It features .525” intake and exhaust lift,
217 degree exhaust duration at .050”, 207 degree intake duration at .050”, and 116 degree lobe centers.
12480033 Camshaft “Gen 3” (Hot Cam)
--
The “Gen 3” (RPO-LS6) engine is used in all 1997 and later Corvettes, and 1998 and later Camaro/Firebird
vehicles. This camshaft is comparable to the LT4 hot camshaft but for your LS1 engine. This kit includes 16 LS6 valve
springs P/N 12565117.
12480110 Camshaft, “Gen 3” V8 (LS1)
--
The “Gen 3” V8 (RPO-LS1) engine is used in all 1997 and later Corvettes, and 1998 and later Camaros.
This camshaft is designed for ASA racing and has .525” lift on 110° center line. Use with “Gen 3”
LS1 engines only.
This hydraulic roller camshaft for RPO LS1 or LS6 was designed for showroom stock road racing. It requires
the use of 2002 and later LS6 hollow stem intake valves P/N 12565311, hollow stem - sodium filled exhaust
valves P/N 12565312, and valve springs P/N 125565313. It features .570” intake and exhaust lift, 251
degree exhaust duration at .050” and 239 degree intake duration at .050”. Technical Notes:
• Center line of intake lobe means M.O.P. or maximum open point, determined across nose of lobe.
• Lobe flank is not symmetrical - for best torque set intake to TDC@105 degree and for best power set
intake to [email protected] degree.
• Cam timing @ 0.050” tappet lift (timed @106 degrees intake to TDC)
• Exhaust opens @ 51 degrees and closes @ 20 degrees with duration at 251.
• Intake opens @ 12 degrees and closes @ 47 degrees with duration at 239.
These steel header flanges are a great way to start a fabricated set of Gen 3 headers for a race car or
street rod. This flange is for stock exhaust port location.
OIL PANS
12561828 Oil Pan, 2002-03 LS6 Corvette
--
This oil pan is used on 2002-03 Corvettes with RPO LS6.
CYLINDER HEAD GASKETS
12498543 Cylinder Head Gasket Kit “1997-2001”
--
This gasket kit includes two head gaskets for 1997 through 2001. LS1 Camaro and Corvette, plus 1991 Corvette LS6 engines.
12498544 Cylinder Head Gasket Kit “2002-2004”
--
This gasket kit includes two head gaskets for 2002 through 2004 LS1 Camaro and Corvette.
CYLINDER HEAD VALVES
12565311 Intake Valve
--
LS6 hollow stem intake valve. Used with P/N 88598606 roller camshaft.
12565312 Exhaust Valve
--
LS6 hollow stem, sodium filled, exhaust valve. Used with P/N 88598606 roller camshaft.
CYLINDER HEAD VALVE SPRINGS
12565313 Valve Spring
--
LS6 valve spring. Used with P/N 88598606 roller camshaft.
12565117 Valve Spring
--
LS6 valve spring. Used with P/N 12480033 “Gen 3” Hot Cam.
VALVE COVERS
12480025 Gen 3 valve cover.
--
This magnesium valve cover can only be used on the discontinued racing cylinder head P/N 12480005 or racing cylinder head P/N 12480090. Technical Note: This valve cover will not fit LS1, LS6, or LQ4 production heads.
CYLINDER HEAD BOLTS
12498545 Cylinder Head Bolt Kit “1997-2004”
--
This bolt kit includes fifteen head bolts for 1997 through 2004 LS1 Camaros and Corvettes and LS6 Corvettes.
This kit services one head only. Two are required per engine. Technical Note: Head bolts cannot be reused on these engines.
TIMING CHAIN DAMPERS
88958607 Timing Chain Damper, LS1, LS6
--
This timing chain damper is intended for high engine speed applications and is used to improve timing chain
life. Some blocks require drilling and taping - an instruction sheet is included.
TIMING CHAINS
88958608 Timing Chain Heavy Duty, 1997-03
--
This is a heavy duty single roller chain that uses thicker alloy steel sideplates to improve strength. It
is a must for high performance Gen 3 engines.
TIMING RINGS
12559353 Timing Ring, Crankshaft Trigger
--
This timing wheel is used on all Gen 3 LS1 and LS6 engines.
CRANKSHAFTS
12559354 Crankshaft Assembly, 1996-03
--
This crankshaft assembly is used on all 1997-2003 production Corvettes and Camaros. This is a nodular cast
crankshaft with casting P/N 12552216.
CONNECTING RODS
12568734 Rod, Connecting, 1997-03
--
This connecting rod is used on all 1997-2003 production Corvettes and Camaros.
Technical Notes: Use with 12568069 LS6 Connecting Rod Bolts
CONNECTING ROD BOLTS
12568069 - LS6 Connecting Rod Bolts
--
These rod bolts have increased strength over all pre-2000 model year “Gen 3 rod” bolts. Recommended
for use in all performance “Gen 3” engines.
INTAKE MAINIFOLDS
88894339 Manifold, Intake
--
This is the Gen 3 fuel injection manifold used on 2001-03 RPO LS6 Corvette engines. The manifold includes
the manifold, intake manifold seal P/N 12560251, intake manifold gasket P/N 12533587, throttle body seal
P/N 12552542, map sensor P/N 16212460, map sensor seal P/N 16194007. [Old P/N 88890523]
Identical to the production LS6 ring pack except the end gaps are unfiled, which allows engine builders to
optimize ring gaps for competition applications. The second ring is a Napier type ring, which controls oil
as well as being a compression ring. The oil rail expander ring is also revised for improved oil control.
Can be used in any Gen 3 type engine. Each ring set does one cylinder of a Gen 3 engine.
88958610 Ring, Piston Gen 3 (+.010) Unfiled Gaps
--
Identical to the production LS6 ring pack except the end gaps are unfiled, which allows engine builders to
optimize ring gaps for competition applications. The second ring is a Napier type ring, which controls oil
as well as being a compression ring. The oil rail expander ring is also revised for improved oil control.
Can be used in any “Gen 3” type engine. Each ring set does one cylinder of a Gen 3 engine.
Technical Notes: Use with .010 over-bored cylinders.
PISTONS
88984245 Piston Assembly, 1997-03
--
This piston assembly is used on all 1997-2003 production Corvettes and Camaros. [Old P/N 88984245]
LS1 engine kit P/N 25534322 installation guide. LS1 design and development, installation notes, engine controls, technical
information, and specifications. 36 pages of information including engine control schematics.
