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Engine Mechanical Specifications (LF1)

Engine Mechanical Specifications (LF1)

Application Specification
Metric English
General

Engine Type


V-6

Displacement


3.0 Liter 183 cu in

RPO


LF1

VIN


G-cars/Y-trucks

Bore


89 mm 3.5039 in

Stroke


80.3 mm 3.1614 in

Compression Ratio


11.7:1

Firing Order


1-2-3-4-5-6

Spark Plug Gap


1.1 mm 0.0433 in
Block

Crankshaft Main Bearing Bore Diameter


72.867-72.881 mm 2.8688-2.8693 in

Cylinder Bore Diameter


88.992-89.008 mm 3.5036-3.5042 in

Cylinder Bore Out-of-Round - Production Max.


0.026 mm 0.001 in

Cylinder Bore Taper


0.020 mm 0.0008 in
Camshaft

Camshaft Bearing Inside Diameter - Front Number 1


35.000-35.020 mm 1.3779-1.3787 in

Camshaft Bearing Inside Diameter - Middle and Rear Number 2-4


27.000-27.020 mm 1.0630-1.0638 in

Camshaft End Play


0.045-0.215 mm 0.0018-0.0085 in

Camshaft Journal Diameter - Front Number 1


34.936-34.960 mm 1.3754-1.3764 in

Camshaft Journal Diameter - Middle and Rear Number 2-4


26.936-26.960 mm 1.0605-1.0614 in

Camshaft Journal Out-of-Round


0.006 mm 0.0002 in

Camshaft Journal to Bore Clearance


0.040-0.084 mm 0.0016-0.0033 in

Camshaft Lobe Lift - Exhaust


42.456-42.756 mm 1.6715-1.6833 in

Camshaft Lobe Lift - Intake


42.385-42.685 mm 1.6687-1.6805 in

Camshaft Runout - Front and Rear Number 1 and 4


0.025 mm 0.0010 in

Camshaft Runout - Middle 2 and 3


0.050 mm 0.0020 in

Valve Lift - Exhaust


10.8 mm 0.4252 in

Valve Lift - Intake


10.8 mm 0.4252 in
Connecting Rod

Connecting Rod Bearing Clearance


0.010-0.070 mm 0.0004-0.0028 in

Connecting Rod Bore Diameter - Bearing End


59.620-59.636 mm 2.3472-2.3479 in

Connecting Rod Bore Diameter - Pin End - Production


24.009-24.019 mm 0.9452-0.9456 in

Connecting Rod Bore Diameter - Pin End - Service Maximum


24.007 mm 0.9457 in

Connecting Rod Length - Center to Center


156.05 mm 6.1437 in

Connecting Rod Side Clearance


0.095-0.355 mm 0.0037-0.0140 in

Connecting Rod Width - Bearing End



Production


21.775 mm 0.8573 in

Service


21.725-21.825 mm 0.8553-0.8593 in

Connecting Rod Width - Pin End



Production


21.775 mm 0.8573 in

Service


21.725-21.825 mm 0.8553-0.8593 in
Crankshaft

Connecting Rod Journal Diameter


55.992-56.008 mm 2.2044-2.2050 in

Connecting Rod Journal Out-of-Round


0.005 mm 0.0002 in

Connecting Rod Journal Taper


0.005 mm 0.0002 in

Connecting Rod Journal Width



Production


22.000 mm 0.8661 in

Service


21.920-22.080 mm 0.8630-0.8693 in

Crankshaft End Play


0.100-0.330 mm 0.0039-0.0130 in

Crankshaft Main Bearing Clearance


0.010-0.060 mm 0.0004-0.0024 in

Crankshaft Main Journal Diameter


68.000 mm 2.6772 in

Crankshaft Main Journal Out-of-Round


0.005 mm 0.0002 in

Crankshaft Main Journal Taper


0.005 mm 0.0002 in

Crankshaft Main Journal Thrust Wall



Runout


0.000-0.040 mm 0.0000-0.0016 in

Square


0.000-0.010 mm 0.0000-0.0004 in

Crankshaft Main Journal Width, #2, 4



Production


24.000 mm 0.9449 in

Service


23.900-24.100 mm 0.9409-0.9488 in

Crankshaft Main Journal Width, #3



Production


24.400 mm 0.9606 in

Service


24.360-24.440 mm 0.9591-0.9622 in

Crankshaft Pilot Bearing Bore Diameter


20.965-20.995 mm 0.8254-0.8266 in

Crankshaft Rear Flange Runout


0.025 mm 0.0010 in

Crankshaft Reluctor Ring Runout - Maximum


2.000 mm 0.0787 in

Crankshaft Runout


0.030 mm 0.0012 in

Crankshaft Thrust Bearing Clearance


0.076-0.305 mm 0.0030-0.0120 in

Crankshaft Thrust Surface - Height Diameter


95.000 mm 3.7401 in

Crankshaft Thrust Surface Runout


0.040 mm 0.0016 in
Cylinder Head

Valve Guide Bore - Exhaust


6.000-6.020 mm 0.2362-0.2370 in

Valve Guide Bore - Intake


6.000-6.020 mm 0.2362-0.2370 in

Valve Guide Installed Height


14.050-14.550 mm 0.5531-0.5728 in

Valve Lifter Bore Diameter


12.008-12.030 mm 0.4728-0.4736 in
Lubrication System

Oil Capacity - With or Without Oil Filter Change


5.7 Liters 6 Quarts

Oil Pressure - Minimum @ Idle


69 kPa 10 psi

Oil Pressure - Minimum @ 2,000 RPM


138 kPa 20 psi

Piston Cooling Jet Valve Opening Pressure


1.7-2.3 bar 25-33 psi
Piston Rings

Piston Ring End Gap



First Compression Ring - Nominal


0.150-0.300 mm 0.0059-0.0118 in

First Compression Ring - Maximum, Ring in Bore


0.350 mm 0.1378 in

Second Compression Ring - Nominal


0.280-0.480 mm 0.0110-0.0189 in

Second Compression Ring - Maximum, Ring in Bore


0.450 mm 0.0177 in

Oil Control Ring


0.150-0.600 mm 0.0059-0.0236 in

Piston Ring to Groove Clearance



First Compression Ring


0.030-0.065 mm 0.0012-0.0026 in

Second Compression Ring


0.015-0.060 mm 0.0006-0.0024 in

Oil Control Ring


0.030-0.170 mm 0.0012-0.0669 in

Piston Ring Thickness



First Compression Ring


1.175-1.190 mm 0.0463-0.0469 in

Second Compression Ring


1.470-1.495 mm 0.0579-0.0589 in

Oil Control Ring


2.360-2.480 mm 0.0929-0.0976 in
Pistons and Pins

Piston



Piston Diameter - Measured Over Skirt Coating


88.476-89.014 mm 3.4833-3.5045 in

Piston Diameter - Service Limit Minimum, w/more than 10k miles


88.926 mm 3.5010 in

Piston Pin Bore Diameter


24.007-24.012 mm 0.9452-0.9454 in

Piston Ring Groove Width - First Compression Ring


1.220-1.240 mm 0.0480-0.0488 in

Piston Ring Groove Width - Second Compression Ring


1.510-1.530 mm 0.0595-0.0602 in

Piston Ring Groove Width - Oil Control Ring


2.510-2.530 mm 0.0988-0.0996 in

Piston to Bore Clearance - Production; Measured at Skirt Coating


0.022-0.032 mm 0.0008-0.0013 in

Piston to Bore Clearance - Service Limit Maximum, w/more than 10k miles


0.650 mm 0.0256 in

Pin



Piston Pin Clearance to Connecting Rod Bore - Production


0.007-0.024 mm 0.0003-0.0010 in

Piston Pin Clearance to Connecting Rod Bore - Service Maximum


0.030 mm 0.0012 in

Piston Pin Clearance to Piston Pin Bore - Production


0.007-0.015 mm 0.0003-0.0006 in

Piston Pin Clearance to Piston Pin Bore - Service Maximum


0.015 mm 0.0006 in

Piston Pin Diameter


23.997-24.000 mm 0.9448-0.9449 in

Piston Pin Length


60.60-61.10 mm 2.3858-2.4055 in
Valve System

Valves



Valve Face Angle


44.25 degrees

Valve Face Runout


0.038 mm 0.0015 in

Valve Face Width - Exhaust


2.750 mm 0.1083 in

Valve Face Width - Intake


2.180 mm 0.0858 in

Valve Head Diameter - Exhaust


30.470-30.730 mm 1.1996-1.2098 in

Valve Head Diameter - Intake


35.03-35.29 mm 1.3791-1.3894 in

Valve Installed Height


35.23-36.69 mm 1.3870-1.4445 in

Valve Length - Exhaust


97.11 mm 3.8232 in

Valve Length - Intake


101.23 mm 3.9854 in

Valve Seat Angle - Seating Surface


45 degrees

Valve Seat Angle - Relief Surface


30 degrees

Valve Seat Angle - Undercut Surface


60 degrees

Valve Seat Roundness- Maximum


0.025 mm 0.0010 in

Valve Seat Runout - Maximum


0.080 mm 0.0032 in

Valve Seat Width - Exhaust Seating Surface


1.400-1.800 mm 0.0551-0.0709 in

Valve Seat Width - Exhaust Relief Surface


0.700-0.900 mm 0.0276-0.0354 in

Valve Seat Width - Intake Seating Surface


1.000-1.400 mm 0.0394-0.0551 in

Valve Seat Width - Intake Relief Surface


0.500-0.700 mm 0.0197-0.0276 in

Valve Stem Diameter - Exhaust


5.945-5.965 mm 0.2341-0.2348 in

Valve Stem Diameter - Intake


5.955-5.975 mm 0.2344-0.2352 in

Valve Stem-to-Guide Clearance - Exhaust


0.035-0.075 mm 0.0014-0.0030 in

Valve Stem-to-Guide Clearance - Intake


0.025-0.065 mm 0.0010-0.0026 in

Valve Lifters - Stationary Hydraulic Lifter Assembly (SHLA)



Valve Lifter (SHLA) Diameter


11.989-12.000 mm 0.4720-0.4724 in

Valve Lifter (SHLA)-to-Bore Clearance


0.037-0.041 mm 0.0015-0.0016 in

Rocker Arms



Valve Rocker Arm Ratio


1.68 to 1

Valve Rocker Arm Roller Diameter


17.740-17.800 mm 0.6987-0.7008 in

Valve Springs



Valve Spring Coil Thickness


3.250 x 3.900 mm 0.1280 x 0.1535 in

Valve Spring Diameter - Inside Top


12.090-12.590 mm 0.4760-0.4957 in

Valve Spring Diameter - Outside Top


20.140 mm 0.7929 in

Valve Spring Diameter - Inside Bottom


17.950-18.450 mm 0.7067-0.7264 in

Valve Spring Diameter - Outside Bottom


26.000 mm 1.0236 in

Valve Spring Free Length


42.050-44.850 mm 1.6555-1.7657 in

Valve Spring Installed Height - Closed


35.000 mm 1.3779 in

Valve Spring Installed Height - Open


24.000 mm 0.9449 in

Valve Spring Load - Closed


247-273 N 56-61 lb

Valve Spring Load - Open


598-662 N 134-149 lb