General Mechanical Specifications

All specs shown below have been pulled from a 98 Camaro service manual. L67 details will be checked and added later.

General specifications

Application Specifications
metric english
Engine Type 90* V6
displacement 231 cubic inches
liters 3.8 L
RPO L36
Bore 96.52 mm 3.8 in.
Stroke 86.36 mm 3.4 in.
Compression Ratio 9.4:1
Firing Order 1-6-5-4-3-2

Lubrication System

Application Specifications
metric english
oil capacity with oil filter change 4.25 L 4.5 qt
oil capacity without oil filter change 3.75 L 4 qt
oil pressure @ operating temperature (1850 RPM) with 10w-30 oil 414 kPa 60 psi min
oil filter type throw away element and can
gear pocket depth 11.71-11.75 mm 0.461-0.4625 in.
gear pocket diameter 89.10-89.20 mm 3.508-3.512 in.
inner gear tip clearance 0.152 mm 0.006 in
outer gear diameter clearance 0.203-0.381 mm 0.008-0.015 in.
end clearance 0.025-0.089 mm 0.001-0.0035 in.
valve-to-bore clearance 0.038-0.076 mm 0.0015-0.003 in.
lubrication type
main bearings pressure
connecting rods pressure
piston pins splash
balance shaft bearing - front splash
balance shaft bearing - rear pressure
camshaft bearings pressure
timing chain splash
cylinder walls splash
oil pump type gerotor
oil pressure sending uint electrical
oil intake stationary
oil filter system full flow

Cylinders

Application Specifications
metric english
cylinder bore diameter 96.5 mm 3.8 in.
cylinder bore out-of-round maximum 0.0254 mm 0.0010 in
cylinder bore taper 0.0254 mm 0.0010 in

Pistons

Application Specifications
metric english
piston clearance (39mm from top of piston) 0.010-0.051mm 0.0004-0.0020 in.
piston ring groove depth - top compression 4.019-4.146 mm 0.1580-0.1630 in.
piston ring groove depth - 2nd compression 4.214-4.341 mm 0.0166-0.1710 in.
piston ring groove depth - oil control 3.814-3.941 mm 0.1500-0.1550 in.
piston ring end gap - top compression 0.305-0.559 mm 0.0120-0.0220 in.
piston ring end gap - 2nd compression 0.762-1.016 mm 0.0300-0.0400 in.
piston ring end gap - oil control 0.254-0.762 mm 0.0100-0.0300 in.
piston ring side clearance - top compression 0.033-0.079 mm 0.0013-0.0031 in.
piston ring side clearance - 2nd compression 0.033-0.079 mm 0.0013-0.0031 in.
piston ring side clearance - oil control 0.023-0.201 mm 0.0009-0.0079 in.
piston ring width - top compression 1.176-1.197 mm 0.0463-0.0471 in.
piston ring width - 2nd compression 1.476-1.497 mm 0.0581-0.0589 in.
piston ring width - oil control 1.854-2.007 mm 0.0730-0.0790 in.
piston pin diameter 21.9950-22.0000 mm 0.8659-0.8661 in.
piston pin clearance in piston 0.0020-0.0130 mm 0.00008-0.00051 in.
piston pin fit-in-rod (clearance) 0.0066-0.0217 mm 0.0003-0.0009 in.

Crankshaft

Application Specifications
metric english
crankshaft - main journal diameter - all 63.470-63.495 mm 2.4988-2.4998 in.
crankshaft - rod journal diameter - all 57.1170-57.1475 mm 2.2487-2.2499 in.
crankshaft - main journal taper - maximum 0.0076 mm 0.0003 in.
crankshaft - rod journal taper - maximum 0.0076 mm 0.0003 in.
crankshaft - main journal out-of-round - maximum 0.0076 mm 0.0003 in.
crankshaft - rod journal out-of-round - maximum 0.0076 mm 0.0003 in.
crankshaft - main bearing to journal clearance 1 0.0178-0.0406 mm 0.0007-0.0016 in.
crankshaft - main bearing to journal clearance 2 and 3 0.0254-0.0580 mm 0.0010-0.0020 in.
crankshaft - main bearing to journal clearance 4 0.0229-0.0457 mm 0.0009-0.0018 in.
crankshaft - rod bearing clearance 0.0127-0.0660 mm 0.0005-0.0026 in.
crankshaft - end play 0.076-0.276 mm 0.0030-0.0110 in.

Connecting Rods

Application Specifications
metric english
connecting rod - rod side clearance 0.102-0.508 mm 0.0040-0.0200 in.
connecting rod - connecting rod large end bore ID 60.295-60.312 mm 2.37378-2.3745 in.

Camshaft

Application Specifications
metric english
camshaft - journal diameter 47.655-46.858 mm 1.8462-1.8448 in.
camshaft - bearing inside diameter 1 and 4 46.970-46.934 mm 1.8428-1.8492 in.
camshaft - bearing inside diameter 2 and 3 46.977-46.942 mm 1.8481-1.8495 in.
camshaft - bearing to journal clearance 0.041-0.119 mm 0.0016-0.0047 in.
camshaft - intake maximum lobe lift 6.55 mm 0.258 in.
camshaft - exhaust maxiumum lobe lift 6.48 mm 0.255 in.

Balance Shaft

Application Specifications
metric english
balance shaft - end play 0.0-0.171 mm 0.0000-0.0067 in.
balance shaft - rear journal diameter 38.085-38.105 mm 1.4994-1.5002 in.
balance shaft - radial play-front bearing clearance 0.0-0.026mm 0.0000-0.0010 in.
balance shaft - rear bearing to journal clearance 0.0127-0.109 mm 0.0005-0.0043 in.
balance shaft - drive gear lash 0.050-0.125 mm 0.0020-0.0049 in.
balance shaft - bearing bore diameter - front 51.973-51.999 mm 2.0462-2.0472 in.
balance shaft - bearing bore diameter - rear, in block 47.584-47.612 mm 1.8735-1.8745 in.
balance shaft - bearing inside diameter - rear 38.118-38.194 mm 1.5007-1.5037 in.

Valve System

Application Specifications
metric english
lifter hydraulic
rocker arm ratio 1.6:1
face angle 45*
seat angle 45*
minimum margin 0.635 mm 0.025 in.
seat runout - maximum 0.050 mm 0.002 in.
seat width - intake 1.53-2.03 mm 0.060-0.080 in.
seat width - exhaust 2.29-2.79 mm 0.090-0.110 in.
stem height - all 49.15-50.17 mm 1.935-1.975 in.
stem clearance - all 0.038-0.089 mm 0.0015-0.0032 in.

Valve Springs

Application Specifications
metric english
valve spring - free length 499.78 mm 1.960 in.
valve spring - load - closed 334 N @ 43.69 mm 75 lb @ 1.72 in.
valve spring - load - open 1014 N @ 32.4 mm 228 lb @ 1.277 in.
valve spring - installed height 42.93-44.45 mm 1.690-1.720 in.
valve spring - number of active coils 4.48
valve spring - number of total coils 6.6

Flywheel

Application Specifications
metric english
flywheel - runout - maximum 0.38 mm 0.015 in.