2.8L Specs

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GM 60-Degree V-6 Specifications

General & Component Specifications


2.8L V6

Bore x Stroke 3.5O3inX2.992in (89mmX76mm)
Firing Order 1-2-3-4-5-6

Bearing Clearances
Main 0.0015-0.0025jn (0.038-0.064mm)
Rod 0.0011 -0.0025in (0.028-0 064mm)
Connecting Rod Side Clearance 0.008-0.020in (0.20-0.51 mm)

Camshaft
Lift
Intake 0.231 in (5.86mm)
Exhaust 0.262in (6.65mm)
Note: Cam above used on early base 2.8L V6’s & some S1Os &
Camaros

Intake 0.262in (6.65mm)
Exhaust 0.273in (6.94mm)
Journal Clearance 0.001 -0.0025in (0.026-0.063mm)

Crankshaft Main Journals

Small journal
#1, #2 & #4 Journals 2.4937-2.4946in (63.340-63.364mm)
#3 Journal 2.4932-2.4941 in (63.327-63.351 mm)
Large Journal 2.647-2.648in (67.241-67.265mm)
Taper (maximum) 0.0002in (0.005mm)
Out-Of-Round (maximum) 0.0002in (0.005mm)

Crankshaft Rod Journals
Small Journal 1.998-1 .999in (50.758-50.784mm)
Large Journal 1.998-1 .999in (50.758-50.784mm)
Taper (maximum) 0.0002in (0.005mm)
Out-Of-Round (maximum) 0.0002in (0.005mm)

Crankshaft End Play 0.0024-0.0083in (0.06-0.21 mm)

Cylinder Bore
Diameter 3.503-3.SO6in (88.992-89.070mm)
Taper (maximum) 0.0008in (0.020mm)
Out-Of-Round (maximum) 0.0008in (0.020mm)
Piston-To-Bore Clearance 0.0007-0.001 7in (0.017-0.043mm)

Oil Pressure (Engine @ Normal Operating Temp)
30-S5psi @ 2000rpm (205-38OkPa @
2000rpm)

Piston Ring End Gap Clearance
Top Compression 0.010-0.020in (0.25-0.50mm)
Second Compression 0.010-0.020in (0.25-0.50mm)
Oil Rails 0.011-0.030in (0.25-0.50mm)

Piston Ring Side Clearance
Top Compression 0.012-0.027in (0.30-0.70mm)
Second Compression 0.016-0.037in (0.40-0.95mm)
Oil (maximum) 0.OO8in (0.200mm)

Rocker Arm Ratio 1.50:1
Valve Stem Clearance 0.001 -0.0027in (0.026-0.068mm)

Valve Spring Pressure
Cast Iron Heads
Valve Open 195lbs @ 1.1 8in (867Nm @ 30mm)
Valve Closed 88lbs @ 1 .575in (391 Nm @ 40mm)

Aluminum Heads
Valve Open 215lbs @ 1.291 (956Nm @33mm)
Valve Closed 9Olbs @ 1.701 (400Nm @ 43mm)

Valve Spring Installed Height 1.575in (40mm)
Cast Iron Heads 1.614in (41mm)
Aluminum Heads 1.575in (40mm)



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