1964.5 Mustang Engine Information – 170 cubic inch I6 (2.8 L Inline 6)

170 Cubic inch engine was only used on the early 1965 Mustangs, (often referred to as 1964 1/2). The engine code was “U”. Paint color was black (paint code 903)and black heads with orange valve covers (paint code 912) and air cleaner. It was an inline six cylinder single barrel carbureted engine rated at 101 or 105 horse power depending on who you believe. I have also seen sources where it was rated at 105 horses, but I believe most sources show 105.

It had a compression of 9.1:1, a bore and stroke of 3.500×2.940. The exhaust was a single exhaust pipe with a single inlet/outlet transverse mounted muffler behind the axle and in front of the gas tank. The muffler resembles the 8 cylinder muffler, but they are not the same.

One could get a 3 speed manual or a Ford-O-Matic automatic transmission with this engine. The engine was available for the early 1965, and 1965 years only. As the Mustang grew in size, so so did the base engine in 1966, the little engine that could grew to 200 cubic inches.

From the Mustang’s first unit, this was the base engine. Although small in size, it did push the car down the road at a fair clip, and it was a dependable little engine. The single barrel carburetor was easy to adjust and did not go out of adjustment very easily. Back in the 60’s gas mileage was not a concern as it was generally under 20 cents per gallon. You could fill up the tank on Monday for about $2.50 and drive it almost all week.

Engine Basics

Year	1964.5
Cylinders	6
Displacement	170 cu / 2.8 liters
Power (hp)	105 hp @ 4,600 RPM
Torque (lb/ft)	140 lb/ft @ 3,200 RPM
Compression	8.2:1
Bore x Stroke	3.660 x 2.700

2.8L Cologne V6 Firing Order

• 2.8 liter engine 171 ci V6
• F.O. 1-4-2-5-3-6
• cylinders front to rear RH 1-2-3
• cylinders front to rear LH 4-5-6
• Cylinder compression pressure 101 psi minimum
• Oil pressure at 2000 rpm and warm 40-60
• Spark plugs AWSF42-C @0.034″
• Thermostat starts to open 192-198 degrees
• Thermostat fully open 226 degrees
• Radiator cap pressure
• Cylinder head warp limit 0.003″ in 6″ or 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.

Intake manifold nuts/bolts (4 steps)	3-6, 6-11, 11-15, 15-18
front cover plate bolts	12-15
Front cover bolts	12-15
Oil pump inlet tube to pump	7-9
Exhaust manifold bolts	27-49
Exhaust pipe to manifold bolts	25-35
flywheel/drive plate bolts	47-51
oil pan bolts	7-10
valve cover bolts	3-5
rocker arm shaft support bolts	43-49
Main bearing cap bolts	65-75
Connecting rod cap nuts	21-25
Fuel pump to block bolts	12-15
Wheel lug nuts	80-105
Front hub nut	17-25, back off then to 10-15 lbs
Harmonic damper	92-103
Bellhousing bolts	35
Tranny to block	35
water pump	20
Engine mount to block bolts	55
Engine mount to frame nuts & bolts
Carb to intake 2150 2V
Carb to intake model 7200 VV
neutral start switch C3 1979-1981	12-15
neutral start switch C3 1982 – 1986	7-10
neutral start switch C4	6-8
neutral start switch C5	55-75 “/lbs
neutral start switch C3 1982 – 1986	84-120 “/lbs
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	21-38
Engine block coolant drain plug	14-18

Valve information

Minimum valve margin width	1/32″
Intake & exhaust valve seat angle	45 degrees
Intake & exhaust valve face angle	44 degrees
Intake & exhaust valve seat width	0.060-0.079
Intake & exhaust valve face runout limit	0.0015″
exhaust valve seat width	0.070 – 0.090
Intake & exhaust valve seat runout limit	0.002
Intake stem diameter Standard	0.3159-0.3167
Intake stem diameter – 0.015 oversized	0.3566-0.3573
Intake stem diameter – 0.030 oversized	0.3376-0.3723
Exhaust stem diameter – standard	0.3149-0.3156
Exhaust stem diameter – 0.015 oversized	0.3561-0.3568
Exhaust stem diameter – 0.030 oversized	0.3711-0.3718
Intake valve stem to guide clearance	0.0008-0.0025
Exhaust valve stem to guide clearance	0.0018-0.0035
Valve spring out of square limit	5/16″
Valve spring pressure, standard	60-68 @1.585″
Valve spring pressure, limit	10% loss
Valve spring free length	1.91 (about)
Valve spring Installed height	1 37/64-1 39/64
Valve lifter diameter	0.8736 – 0.8741
Valve lifter to bore clearance	0.0009 – 0.0024
Service limit	0.005″

Crankshaft Specifications

Connecting rod journal diameter – Standard	2..1252-2.1260″
Connecting rod journal out-of-round	0.0006″
Connecting rod journal taper limit	0.0006″ per inch
Connecting rod Bearing oil clearance desired	0.0006-0.0016″
Connecting rod Bearing oil clearance allowed	0.0005-0.0022″
Connecting rod side clearance std.	0.004-0.0011″
Connecting rod side clearance allowed	0.014
Main Bearing journal diameter	2.2433-2.2441″
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	0.0008-0.0019″
Crankshaft endplay	0.004-0.008″
Crankshaft endplay service limit	0.012″
Cylinder bore diameter	3.6614-3.6630
Cylinder bore out-ofround limit	0.005″
Cylinder bore taper limit	0.010″
Piston diameter coded red	3.6605-3.6615″
0.20 oversized	3.3.6802-3.6812
Piston to bore clearance	0.001-0.0019″
Piston ring end gap compression rings	0.015-0.023
Piston ring end gap – oil rings	0.015-0.055
Piston ring side clearance, compression rings – Standard	0.0020-0.0033″
Piston ring side clearance service -limit	0.006
Oil ring	Snug fit