Production = (P), Service Limit = (SL), Out-of-Round = O-o-R
Run Out = RO, Inside Dia. = ID, Outside Dia. = OD
CAMSHAFT:
Base Circle Dia.:
‘97-’04 LS1 = 19.7mm / 0.776″
‘01 LS6 = 19.3mm / 0.760″
‘02 -’04 LS6 = 19.0mm / 0.748
End Play: 0.025-0.305mm / 0.001-0.012″
Journal Dia.: 54.99-55.04mm / 2.164-2.166″
Journal Dia. O-o-R: 0.025mm / 0.001″
Intake Lobe Lift: 7.04mm / 0.277″
Exhaust Lobe Lift: 7.13mm / 0.281″
Poller Lifter Dia.: 17.78mm / 0.700″
RO @ Intermediate Journals: 0.05mm / 0.002″
Lobe Base Circle Radius:
‘97-’04 LS1: 19.7mm / 0.776″
‘01 LS6: 19.3mm / 0.760″ (reduced for ^ valve lift)
‘02-’04 LS6: 19.0mm / 0.748 ” ” ” ” ” ”
CONNECTING ROD:
Bearing Bore Dia.: 56.505-56.525mm / 2.224-2.225″
Bearing Bore O-o-R (P): 0.004mm / 0.00015″
Bearing Bore O-o-R (SL): 0.008mm / 0.0003″
Bearing Clearance (P): 0.015-0.063mm / 0.0006-0.00248″
Bearing Clearance (SL): 0.015-0.076mm/0.0006-0.003″
Bearing Width: 24mm / 0.9449″
Side Clearance: 0.11-0.51mm / 0.00433-0.02″
Center to Center: 154.89mm / 6.098″
Piston Pin Bore Dia.: 23.97mm / 0.9436″
Piston Pin Boss Width: 24mm / 0.9449″
Piston Pin Press Interference:0.020-0.043mm / 0.0008-0.0017″
Rod Bolts: M9 x 1″ (replace with ARP/Katech if > 450HP)
CRANKSHAFT:
Rotation = Clockwise (looking at front of block)
Bearing Clearance (P): 0.018-0.054mm / 0.0007-0.00212″
Con Rod Journal Dia. (P): 53.318-53.338mm / 2.0991-2.0999″
Con Rod Journal Dia. (SL): 53.308mm Min. / 2.0987″ Min.
Con Rod Journal Taper (P): 0.005mm / 0.0002″
(Maximum for 1/2 Journal length)
Con Rod Journal Taper (SL): 0.01mm Max. / 0.0004″ Max.
Con Rod Journal O-o-R (P): 0.005mm / 0.0002″
Con Rod Journal O-o-R (SL): 0.01mm / 0.0004″
Con Rod Journal Width: 48.37mm / 1.902″
End Play: 0.04-0.2mm /0.0015-0.0078″
Main Journal Dia. (P): 64.993-65.007mm / 2.558-2.559″
Main Journal Dia. (SL): 64.993mm Min. / 2.558″ Min.
Main Journal O-o-R (P): 0.003mm / 0.000118″
Main Journal O-o-R (SL): 0.008mm / 0.0003
Main Journal Taper (P): 0.01mm / 0.0004″
Main Journal Taper (SL): 0.02mm / 0.00078″
Main Journal Width: 22.99mm / 0.905″
Reluctor Ring RO: 0.25mm / 0.01″
(Measured @ 1.0mm/0.04″ below tooth Dia.)
Crank RO : 0.05mm / 0.002″ (Measured at rear flange)
Flywheel Bolt Base Circle: 78.99mm / 3.110″
Stroke: 92mm / 3.622″
Rear Seal ID: 114.99mm / 4.527″
Thrust Wall RO: 0.025mm / 0.001″
Thrust Wall Width (P): 26.14-26.22mm / 1.029-1.032″
Thrust Wall Width (SL): 26.32 Max. / 1.036″ Max.
CYLINDER BORE:
Bore Dia.: 99.0-99.018mm / 3.897-3.898″
Bore Taper Thrust Side: 0.018mm Max. / 0.0007″ Max.
Bank Angle = 45 degrees
Cylinder Bank Offset: 24.10mm / 0.949″
ENGINE BLOCK: A319 T5 / 107#’s
Length: 519mm / 20.43″
Width: 460mm / 18.11″
Deck Height: 234.57-234.82mm / 9.235-9.245″
Cylinder Bank Angle = 45 degrees
Cylinder Bank Offset: 24.10mm / 0.949″
Center Main = Crank Thrust Wall #3
Indexing = Crank CenterLine
Camshaft Bearing Bore Dia.: 55.063-55.088mm / 2.168-2.169″
Block Deck Flatness: 0.11mm / 0.004″ (measured within 6″)
Block Deck Flatness: 0.22mm / 0.008″ (length of Deck)
Main Bearing Bore Dia. (P): 69.871-69.889mm / 2.750-2.751″
Valve Lifter Bore Dia. (P):21.417-21.443 / 0.843-0.844″
FUEL INJECTION:
LS1 Static Flow Rate = 3.6 gal/sec.
Cranking Fuel pressure = 53 to 63 psi
IGNITION:
Coil Output = 60mJ
Sparkplug Wire length = 219mm
Sparkplug Type = AC 41-931 / Beru Silverstone S1K
Sparkplug gap = 1.5mm / 0.060″
INTAKE MANIFOLD:
Head Deck Flatness: 0.5mm / 0.02″ @ gasket mating surface
LS1 MAF ID = 75mm
LS1 Throttle Body ID = 75mm
LS6 MAF ID = 80mm
LS6 Throttle Body ID = 80mm
OIL PAN & FRONT/REAR COVER Alignment:
Oil Pan to Rear of Block: 0.0-0.25mm / 0.0-0.01″
(@ Bellhousing Surface)
Front Cover: 0.0-0.5mm / 0.0-0.2″ (@ Oil Pan Surface)
Rear Cover: 0.0-0.5mm / 0.0-0.2″ (@ Oil Pan Surface)
OIL PUMP:
Dia: 89.99mm / 3.543″
Gear Thickness: 10.69mm / 0.421″
Pressure Relief Setting (Factory): 60 psig @ 5,000 RPM
PISTONS: Cast Eutectic Aluminum, +’03 have coated skirts
Weight = 434 grams
Piston OD: 98.964-98.982mm / 3.8962-3.8969″
Piston to Bore Clearance(P): 0.018-0.054mm/0.0007-0.00212″
Piston to Bore Clear. (SL): 0.018-0.054mm / 0.0007-0.00212″
(Maximum)
Piston Deck Height in Operation: 0.203mm / 0.008″
(Above Deck Surface)
Top Land Thickness: 34mm / 0.177″
PISTON PINS:
Pin to Piston Bore (P): 0.01-0.02mm / 0.0004-0.00078″
Pin to Piston Bore (SL): 0.01-0.02mm / 0.0004-0.00078″ Max.
Pin Dia.: 23.997-24.0mm / 0.9447-0.9448″
Pin Fit in Con Rod: 0.02-0.043mm / 0.00078-0.00169″
(Interference)
PISTON RINGS:
Top Comp. Thickness: 1.500mm / 0.59″
Top Comp. Gap Clocking: None Required
Top Comp. End Gap (P): 0.23-0.38mm / 0.009-0.0149″
Top Comp. End Gap (SL): 0.23-0.38mm / 0.009-0.0149″ Max.
Top Comp. Groove (P):0.04-0.085mm / 0.00157-0.003346″
Top Comp. Groove (SL):0.04-0.085mm/0.00157-0.003346″Max.
2nd Comp. Thickness: 1.500mm / 0.59″
Top Comp Gap Clocking: None Required
2nd Comp. End Gap (P): 0.44-0.64mm / 0.0173-0.0251″
2nd Comp. End gap (SL): 0.44-0.64mm / 0.0173-0.0251″ Max.
2nd Comp. Groove (P): 0.04-0.08mm / 0.00157-0.003149″
2nd Comp. Groove (SL):0.04-0.08mm/0.00157-0.003149″Max.
Oil Cont. Rail Thickness (2): 3.00mm / .188″ (EACH)
Oil Cont. Top Rail Gap Clocking: 25 degrees from Top Ring
Oil Cont. 2nd Rail gap Clocking: 25 degrees from Expander
Oil Cont. End Gap (P): 0.18-0.69mm / 0.007-0.0271″
Oil Cont. End Gap (SL): 0.18-0.69mm / 0.007-0.0271″ Max.
Oil Cont. Groove (P): 0.01-0.22mm / 0.0004-0.00866″
Oil Cont. Groove (SL):0.01-0.22mm / 0.0004-0.00866″ Max.
VALVETRAIN: Hydraulic Roller
Rocker Arm Ratio = 1.70:1
Valve Lash Net Lash: No Adjustment
Valve Face Angle = 45 degrees
Valve Seat Angle = 46 degrees
Valve Seat RO: 0.05mm / 0.002″ Max.
Valve Seat Width (Intake) = 1.02mm / 0.04″
Valve Seat Width (Exhaust) = 1.78mm / 0.07″
Valve Stem:
Clearances:
Intake (P): 0.025-0.066mm / 0.001-0.0026″
Intake (SL): 0.093mm / 0.0037″ Max.
Exhaust (P): 0.025-0.066mm / 0.001-0.0026″
Exhaust (SL): 0.093mm / 0.0037″ Max
Oil Seal Installed Height = 18.1-19.1mm / 0.712-0.752″
(Measured from VS Shim toTop Edge od Seal Body)
Valve Stem Dia. (P): 7.955-7.976mm / 0.313-0.314″
Valve Stem Dia. (SL) 7.9mm / 0.311 Min.
Valve Spring:
Free Length = 52.9mm / 2.08″
Pressure (Closed) = 340 N @ 45.75mm / 76# @ 1.80″
Pressure (Open) = 980 N @ 33.55mm / 220# @ 1.32″
Installed Height (Intake) = 45.75mm / 1.800″
Installed Height (Exhaust) = 45.75mm / 1.8″
Valve Guide Installed Height = 17.32mm / 0.682″
(Measured from Spring Seat Surface to Top of valve Guide)
Roller Lifter Dia.:17.78mm / 0.700″
Valve Material: Stainless Steel, Hollow Stems, Na filled Exhaust
Cams
1997-2000
0.472/0.479, 202/210 on 117
2001 LS1
.500/0.500, 198/208 on 115.5LSA
2001 LS6
0.525/0.525, 204/211 on 116
2002 LS6
0.551/0.547, 204/218 on 117.5
CYLINDER HEAD: A356 T6
Block Deck Flatness: 0.11mm / 0.004″ (within a 6″ area)
Block Deck Flatness: 0.22mm / 0.008″ (length of head)
Exhaust Manifold Deck Flatness: 0.22mm / 0.008″
Intake Manifold Deck Flatness: 0.22mm / 0.008″
Height: 120.2mm / 4.732″ (Deck to Rocker Cover Surfaces)
Valve Angle: 15 degrees
Valve Guide Material = Sintered Iron (Press IN)
Valve Guide Seperation: 48.6mm / 1.913″
Valve Seat Angles: 30/45/60 degree blend into chamber
Valve Stem Dia.: 8.001mm / 0.315″
ALL Gen III heads are interchangable.
Here is a list of a few casting #’s:
933 97 aluminum perimeter bolt 5.7
806 97-98 aluminum perimeter bolt 5.7
853 99-00 aluminum center bolt 5.7
241 01-03 aluminum center bolt 5.7 (some late MY00 cars got 241 castings)
243 LS6 aluminum center bolt 5.7
862 and 706 99 and up 4.8-5.3 truck heads
873 99-00 LQ4 6.0 iron center bolt heads
317 01 and up LQ4 6.0 aluminum center bolt heads
035 02 and up LQ9 6.0 aluminum center bolt heads
Even more info:
Casting Number 241
Head: 1997+ LS1 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12559806 (1997-98) Chambers = 69cc
12559853 (1999-00)
12564241 (2001-03)
Combustion Chamber Volume: 66.67cc
Compression Ratio: 10.1:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
Casting Number 243
Head: 2001 LS6 5.7 Litre Passenger Car
Material: Aluminimum
Part Number:
12564243
Combustion Chamber Volume: 64.45cc
Compression Ratio: 10.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
Casting Number 706
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches
Casting Number 373
Head: 1999-2000 LQ4 6.0 Litre Truck
Material: Cast Iron
Part Number:
12561873
Combustion Chamber Volume: 71.06cc
Compression Ratio: 9.5:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
Casting Number 317
Head: 2001+ LQ4 6.0 Litre Truck
Material: Aluminimum
Part Number:
12572035
Combustion Chamber Volume: 71.06cc
Compression Ratio: 10:1
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
- It takes about .005″ milling of the block deck to remove 1cc of volume. It takes .007″ milling to remove 1cc from an LS1 head
Simple Milling Math:
You have a stock 66cc chamber and you want to get down to 63cc
66-63 = 3. You have to remove 3cc’s
.007 x 3 = .021. So to get your 66cc chambers down to 63cc you’d have to mill ~.021.
You can also do the reverse, say you want to mille a head .030 to figure out how many CC’s that removes you take .030 / .007 = ~ 4.28. Milling a stock 5.7 head .030 puts your chamber at ~ 62.
Gen III Powered Vehicles
The 4.8/293, 5.3/325, 5.7/346, and 6.0/364 can be found in…
Cars
1997 – 2004 Chevrolet Corvette (5.7)
1998 – 2002 Chevrolet Camaro (5.7)
1998 – 2002 Pontiac Firebird (5.7)
2004 – 2005 Cadillac CTS-V (5.7)
2004 Pontiac GTO (5.7)
Trucks, Vans, SUVs
1999 – 2004 Chevrolet Silverado (4.8, 5.3, 6.0)
2000 – 2004 Chevrolet Tahoe (4.8, 5.3)
2000 – 2004 Chevrolet Suburban (5.3, 6.0)
2002 – 2004 Chevrolet Avalanche (5.3)
2003 – 2004 Chevrolet Express (5.3, 6.0)
2003 – 2004 Chevrolet SSR (5.3)
2003 – 2004 Chevrolet Trailblazer (5.3)
1999 – 2004 GMC Sierra (4.8, 5.3, 6.0)
2000 – 2004 GMC Yukon (4.8, 5.3, 6.0)
2003 – 2004 GMC Envoy (5.3)
2003 – 2004 GMC Savana (5.3, 6.0)
2001 – 2004 Cadillac Escalade (6.0)
2002 – 2004 Hummer H2 (6.0)
2003 – 2004 Isuzu Ascender (5.3)
2004 Buick Rainier (5.3)
Models LS1 Offered In
1997 – 2004 Chevrolet Corvette
1998 – 2002 Chevrolet Camaro (Z28 and SS)
1998 – 2002 Pontiac Firebird (Formula and Trans Am)
2004 Pontiac GTO
LS1 Specifications
1997 – 2000 Chevrolet Corvette
345hp @ 5600rpm
350tq @ 4400rpm
2001 Chevrolet Corvette
350hp @ 5200rpm
375tq @ 4400rpm (360tq @ 4000rpm w/Automatic)
2002 – 2004 Chevrolet Corvette
350hp @ 5200rpm
375tq @ 4000rpm (360tq @ 4000rpm w/Automatic)
1998 – 2000 Chevrolet Camaro Z28
305hp @ 5200rpm
335tq @ 4400rpm
1998 – 2000 Chevrolet Camaro SS*
320hp @ 5200rpm
345tq @ 4400rpm
2001 – 2002 Chevrolet Camaro Z28
310hp @ 5200rpm
340tq @ 4000rpm
2001 – 2002 Chevrolet Camaro SS*
325hp @ 5200rpm
350tq @ 4000rpm
1998 – 2000 Pontiac Firebird Formula/Trans Am*
305hp @ 5200rpm (320hp @ 5200rpm w/WS6)
335tq @ 4400rpm (345tq @ 4400rpm w/WS6)
2001 – 2002 Pontiac Firebird Formula/Trans Am*
310hp @ 5200rpm (325hp @ 5200rpm w/WS6)
340tq @ 4000rpm (350tq @ 4000rpm w/WS6)
2004 Pontiac GTO
350hp @ 5200rpm
365tq @ 4000rpm
Models LS6 Offered In
2001 – 2004 Chevrolet Corvette Z06
2004 – 2005 Cadillac CTS-V
LS6 Specifications
2001 Chevrolet Corvette Z06
385hp @ 6000 rpm
385tq @ 4800 rpm
2002 – 2004 Chevrolet Corvette Z06
405hp @ 6000 rpm
400tq @ 4800 rpm
2004 – 2005 Cadillac CTS-V
400hp @ 6000rpm
395tq @ 4800rpm
* Does NOT include Firehawk or optional SS content from SLP.
The Gen III Small Block V8
RPO, Cubes, Bore x Stroke, and Liters
LR4, 293 cu/in, 3.779” x 3.268”, 4.8 Liters
LM4/LM7/L59, 325 cu/in, 3.779” x 3.622”, 5.3 Liters
LS1/LS6, 346 cu/in, 3.898” x 3.622”, 5.7 Liters
LQ4/LQ9, 364 cu/in, 4.000” x 3.622”, 6.0 Liters
Gen VII Big Block (thrown in for good measure)
L18, 496 cu/in, 4.250” x 4.37”, 8.1 Liters
The 5.3 is NOT a 327.
The 5.7 is NOT a 350.
The 8.1 is NOT a 502.