LS1/LS6 Engine Dimensions & Clearances
 

LS1/LS6 Engine Dimensions & Clearances

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"

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"

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

very good info

ive been waiting for this list for a long time...


j-rod?, more like j-god

Great info!

you have the lift backwards on those cams...the earlier cams had the higher lift.....

trchredC5
 

Hi Folks,
What are numbers for the 04 cam?

stroker
 

would i need to machine the block for clearence for a 383 stroker in a 98 ls1?

ls1 bob wehigt
 

how much the bob wehigt the cranckshaft 3.622 ls1

How much of this would transfer to a 5.3? Is there somewhere that I could find that info?

How much cam lift can the stock pistons clear?

great breakdown of the numbers!!

A lot of useful knowledge

Under valvetrain, where it says clearances, that would be piston to valve clearance, correct?

whats the out of round spec for the crank snout (ballancer end) I am guessing .001" across the board for LS1,LS2, 4.8/5.3/6.0L

Need to know for 07 LR4 4.8L hit hard upfront chipped ballancer, bent bolt, and ballencer, checked crank runout at nose (snout) less then .001"

Internal balance?
 

are these internal balance with nuetral flywheel? can I put a flexplate on a motor that originally came with a flywheel? also, will the stock plastic manifold hold 15 pounds of boost? thanks.

Thanks for taking the time to list all this

I'm looking at an Ls1 guys says its 383 trying to find out if true I measured the down stroke and wit measured 5 3/4 inches from top of the plug hole with 242 heads does anyone know if this is correct for a 383 or 346

wow that makes way more sense to me lol i was like i had a 00 ss and it came 345 hp stk and i know the 01 and 02 had like what 325ish?, i was like wtf hows that work the 02 with a bigger cam and less hp??!??! thanks for clearin that up lol

Hi,

the engine spec list is great, but has anyone the measurements for the Camshaft Bearing Bores width (length)?

Thank you for any input in advance.

Greets

Dan

I see that the valve face angle is 45* and the seat angle is listed as 46*.

Is this information correct? do they run interference valve jobs from GM?