hopefully you'll never need to use all this info but...(copied from the S10Forum)History of Chevrolet's 2.2L:http://www.s10forum.com/forum/f105/2-2-growing-pains-321784/Engine Mechanical SpecificationsApplicationSpecificationsMetricEnglishGeneral DataEngine TypeL-4Regular Production Option (RPO) Code LN2 VIN Code 4/L43 VIN Code 5Displacement2.2 L134 CIDBore89 mm3.5 inStroke88 mm3.46 inCompression Ratio9:1Firing Order1-3-4-2Oil Pressure @ 65°C (150°F)348 kPa56 psi @ 3000 RPMCamshaftJournal Clearance0.038-0.088 mm0.0015-0.0035 inJournal Diameter47.453-47.478 mm1.868-1.869 inLobe Lift - Inlet and Exhaust6.687 mm0.2633 inCrankshaftCrankshaft End Play0.0511-0.1780 mm0.002-0.007 inMain Bearing Clearance0.015-0.047 mm0.0006-0.0019 inMain Journal Diameter63.360-63.384 mm2.4945-2.4954 inMain Journal Out Of Round0.005 mm0.00019 inMain Journal Taper0.005 mm0.00019 inRod Bearing Journal Clearance0.025-0.079 mm0.00098-0.0031 inRod Bearing Journal Diameter50.758-50.784 mm1.9983-1.9994 inRod Bearing Journal Out Of Round0.005 mm0.00019 inRod Bearing Journal Taper0.005 mm0.00019 inRod Side Clearance0.10-0.38 mm0.0039-0.0149 inCylinder BoreDiameter88.991-89.009 mm3.5036-3.5043 inLubrication SystemOil Capacity Without Filter Change3.473 L3.5 qtsOil Pressure (3000 RPM @ 65°C (150°F)348 kPa56 psi min.Out Of Round Maximum0.013 mm0.0005 inTaper - Thrust Side Maximum0.013 mm0.0005 inWhen Changing the Oil Filter, Up to an Additional 0.473 Liter or One Half Quart of Oil May Be Needed. Filter Type or EquivalentPF-47Cylinder HeadCylinder Head Deck Face - Overall Maximum Flatness0.08 mm0.003 inCylinder Head Deck Face - Maximum Flatness within any 150 mm (5.92 in) length0.05 mm0.002 inCylinder Head Deck Face - Maximum Flatness within 25 mm (0.984 in) length0.025 mm0.001 inOil PumpEnd Clearance0.05-0.18 mm0.002-0.007 inGear Diameter - Drive Gear38.05-38.10 mm1.498-1.50 inGear Diameter - Idler38.05-38.10 mm1.498-1.5 inGear Lash0.094-0.195 mm0.004-0.008 inGear Length - Drive Gear30.45-30.48 mm1.199-1.20 inGear Length - Idler30.45-30.48 mm1.199-1.20 inGear Pocket Depth30.36-30.44 mm1.195-1.198 inGear Pocket Diameter38.18-38.25 mm1.503-1.506 inGear Side Clearance - Drive Gear0.038-0.102 mm0.001-0.004 inGear Side Clearance - Idler0.038-0.102 mm0.001-0.004 inOil Pump Drive to Driven Gear Backlash0.23-0.51 mm0.0091-0.0201 inOuter Gerotor Thickness17.087-17.099 mm0.6727-0.6731 inValve to Bore Clearance0.038-0.089 mm0.0015-0.0035 inPistonClearance - 42.7 mm from top of pistonFactory Specification0.015-0.047 mm0.00059-0.00185 inService Specification0.015-0.087 mm0.0006-0.0034 inPiston PinClearance In Piston0.0079-0.018 mm0.00031-0.00071 inDiameter20.3200-20.3251 mm0.8000-0.8002 inInterference Fit In Rod0.021-0.0511 mm0.0008-0.002 inPiston Ring CompressionSecond Groove Side Clearance0.02-0.08 mm0.0008-0.0031 inSecond Ring Gap0.30-0.45 mm0.0012-0.0177 inTop Groove Side Clearance0.05-0.09 mm0.0020-0.0035 inTop Ring Gap0.25-0.50 mm0.010-0.020 inPiston Ring OilGap0.25-0.76 mm0.010-0.030 inGroove Clearance0.013-0.220 mm0.0005-0.0087 inValve SystemRocker Arm Ratio1.6Valve Face Angle45°Valve Face Runout0.038 mm0.0014 inValve Guide Inside Diameter7.000-7.020 mm0.275-0.276 inValve Head Diameter - Exhaust37 mm1.45 inValve Head Diameter - Inlet44 mm1.73 inValve Margin - Exhaust2.21-1.79 mm0.087-0.070 inValve Margin - Inlet1.56-1.16 mm0.061-0.046 inValve Overall Length - Exhaust127 mm5.00 inValve Overall Length - Inlet134.23 mm5.28 inValve Seat Width - Exhaust3.51 mm0.138 inValve Seat Width - Inlet2.80 mm0.110 inValve Springs Free Length48.7 mm1.91 inValve Springs Load - Closed361-325 N @ 40.64 mm81.2-73.1 lb @ 1.600 inValve Springs Load - Open957-893 N @ 29.85 mm215-201 lb @ 1.175 inValve Stem to Guide Clearance - Exhaust0.035-0.075 mm0.0014-0.0029 inValve Stem to Guide Clearance - Inlet0.019-0.053 mm0.0007-0.0020 inValve Tip to Retainer Groove Centerline - Exhaust5.38-5.90 mm0.212-0.232 inValve Tip to Retainer Groove Centerline - Intake4.94-5.46 mm0.194-0.215 in