1979 Mustang Inline 6

1981 Mustang Engine Information & Specs – 200 Ford Straight 6 (3.3 L)

3.3 L Ford Straight Six Technical Specs & Data

1981 Mustang Engine Information – 200 cubic inch I6 (3.3 L Ford Inline 6)

The 3.3L Ford Straight Six

The 3.3 liter, 200 ci engine was used in 1979, 1980 and 1981. However, this was not FORD’s first 200 cubic inch inline six cylinder engine. A 200 ci engine first appeared in the Mustang line in 1965 and ran through the 1970 year run. After that it was just too small to drive the monstrous 1971, 1972 and 1973 Mustangs so it was eliminated from the Mustang engine line and replaced with a bigger 250 cubic inch engine. I had a 200 cubic inch engine in a Falcon back in the 1960’s. Although it was not a fireball, it was very dependable.

Engine Basics

Year 1981
Cylinders 6
Displacement 200 cu / 3.3 liters
Power (hp) 89 hp @ 4,200 RPM
Torque (lb/ft) 143 lb/ft @ 2,300 RPM
Compression 8.7:1
Bore x Stroke 3.660 x 2.700

3.3L Ford V6 Firing Order

3.3 liter, 200 ci engine cylinders front to rear 1-2-3-4-5-6

Firing Order 1-5-3-6-2-4

Distributor rotation CW

More Specs

  • Cylinder compression pressure: 101 PSI minimum
  • Oil pressure at 2000 rpm and warm: 30-50
  • Spark plugs: BSF82-C @0.050″
  • Thermostat starts to open: 193-200
  • Thermostat fully open: 212
  • Radiator cap pressure: 16
  • Cylinder head warp limit: 0.003″ per 6″: 0.006″ total

Engine & Other Torque Specifications

All torque specifications provided in this table are those recommended by FORD. If you use special bolts, follow the torque specifications provided by the manufacturer. I recommend that you use the 3 step torque technique where you torque down the bolts in three equal steps. Once you have reached the maximum recommended torque setting, go around one more time. Do not torque in a circular pattern. Always torque cross to cross.

Cylinder head bolts (3 steps) 50-55, 60-65,70-75
Intake manifold nuts/bolts (4 steps)
Oil pump inlet tube to pump 10-15
Exhaust manifold bolts 18-24
Exhaust pipe to manifold bolts
flywheel/drive plate bolts 75-85
oil pan bolts 7-9
valve cover bolts 3-5
Drive plate to torque converter 30-35
Main bearing cap bolts 60-70
Connecting rod cap nuts 21-26
Fuel pump to block bolts
Wheel lug nuts 80-105
Front hub nut 17-25, back off 1/2 turn, then 10-15
Harmonic dampener 85-100
Bellhousing bolts
Transmission to block 28-38
water pump 12-18
Cylinder front cover bolts 6-9
Pulley to harmonic damper 35-50
Rocker arm shaft to cylinder head 30-35
Engine mount to block bolts
Engine mount to frame nuts & bolts
Carb to intake 2150 2V 14-16
Carb to intake model 7200 VV 12-15
neutral start switch C3 1979-1981 12-15
neutral start switch C4 6-8
neutral start switch AOD 8-11 lbs
Auto transmission pan bolts C3 12-17
Auto transmission pan bolts C4 & C5 12-16
Auto transmission pan bolts A4LD 8-10
Auto transmission pan bolts AOD 6-10
Spark plugs 10-15
Oil pan drain Plug 15-25
Engine block coolant drain plug 5-10
Camshaft sprocket bolt 35-45
Camshaft thrust plate to block 12-18
Fuel pump to block 12-18
Front cover bolts 12-18
Oil filter insert to block 10-15
Oil pump to block 10-15
Thermostat housing bolts 12-18
Fan pulley to hub 12-18
fuel pump to block 12-18

Valve information

Minimum valve margin width 1/32″
Intake & exhaust valve seat angle 45 degrees
Intake & exhaust valve face angle 44 degrees
Intake valve seat width 0.060-0.080″
exhaust valve seat width 0.070-0.090″
Intake & exhaust seat runout limit 0.002″ total
Intake stem diameter Standard 0.3100-.03107″
Intake valve stem to guide clearance 0.0008-0.0025
Intake & exhaust valve face runout limit 0.002
Exhaust stem diameter 0.3098-0.3105
Exhaust valve stem to guide clearance 0.0010-0.0027
Valve spring pressure, Intake standard 51 – 57 @ 1.59″
Valve spring pressure, Exhaust standard 142-158 @ 1.22″
Valve spring pressure, limit Intake & Exhaust 10% loss
Valve spring free length 1.79″
Valve spring Installed height 1 9/16 – 1 19/32
Valve lifter diameter 0.8740-0.8754
Valve lifter to bore clearance Standard 0.0007-0.0027
Valve lifter to bore clearance Limit 0.005

Crankshaft Specifications

Connecting rod journal diameter – Standard 2..1232-2.1240″
Connecting rod journal out-of-round 0.0006″
Connecting rod journal taper limit 0.0006″ per inch
Connecting rod Bearing oil clearance desired 0.0008-0.0015″
Connecting rod Bearing oil clearance allowed 0.0008-0.0024″
Connecting rod side clearance std. 0.0025-0.0105″
Connecting rod side clearance allowed 0.014
Main Bearing journal diameter 2.2482-2.2490″
Main Bearing journal out-of-round limit 0.0006
Main bearing taper limit 0.0006″ per inch
Main Bearing journal oil clearance desired 0.0008-0.0015″
Main Bearing journal oil clearance allowed 0.0008-0.0024″
Crankshaft endplay 0.004-0.008″
Crankshaft endplay service limit 0.012″
Cylinder bore diameter 3.6800-3.6848
Cylinder bore out-of round limit 0.005″
Cylinder bore taper limit 0.010″
Piston diameter coded red 3.6784-3.6790
Piston diameter coded blue 3.6796-3.6802
Piston to bore clearance 0.0013-0.0021″
Piston ring end gap compression rings 0.08-0.016
Piston ring end gap – oil rings 0.015-0.055
Piston ring side clearance, compression rings – Standard 0.0020-0.0040″
Piston ring side clearance service -limit 0.006
Oil ring Snug fit