1968 Mustang 427

1968 Mustang Engine Information & Specs – 427 FE Hipo V8 (7.0 L)

427 FE Hipo V8 Technical Specs & Data

1968 Mustang Engine Information – 427 cubic inch V-8 (7.0 FE Hipo V8)

This engine was offered for one year only in the Mustang. It was very expensive to make and offered less value to the customer than the 428 engine. It was dropped after one year and the 428 became the engine of choice for the performance group unless you could afford the “Big Boss”.

Engine Basics

Year 1968
bbl 4
Cylinders 8
Power (hp) 390 hp @ 5,600 RPM
Torque (lb/ft) 460 hp @ 3,200 RPM
Compression 10.9:1
Displacement 427 cu / 7.0 liters
Bore x Stroke 4.236 x 3781

Engine 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.

Head bolts 100-110
Crank cap bolts 53-58
Rod end caps 95-105
Intake bolts 32-35
Exhaust manifold bolts 18-24
Harmonic damper 70-90
A/C Compressor mounts
Engine fan
Motor mounts to engine
Bellhousing bolts 25
Trans to bellhousing
Flywheel to Crankshaft 75-85
Oil pan bolts 12
Valve cover bolts 10
Carburetor mount bolts 10
Oil pump 15
Spark plugs
Trans. inspection plate
Water pump bolts 20
Clutch pressure plate 35
Water pump
Upper cam gear 40
Rocker arms 45
Main cap cross bolts 40

Crankshaft Bearing Journal Specifications

Main Bearing Journal (inches)

Journal Diameter 2.7484 – 2.7492
Oil Clearance 0.0010 – 0.0031
Shaft end play 0.004 – 0.010
Thrust on number 3

Connecting Rod Journals

Journal Diameter 2.4380 – 2.4388
Oil Clearance 0.013 – 0.0032
Side clearance 0.010 – 0.020

Piston Ring Specifications

Comp Ring Width

Top 0.0774 – 0.0781
Bottom 0.0930 – 0.0940

Ring side clearance

Top 0.002 – 0.004
Bottom 0.002 – 0.004
Oil ring Snug

Ring gap width

Top 0.010 – 0.031
Bottom 0.010 – 0.020
Oil Ring 0.015 – 0.066

Piston Specifications

Code Red 3.9984 – 3.3990 3.9978 -3.9984 (HP)
Code Blue 3.9996 – 4.0002 3.9990 – 3.9996 (HP)
0.003 Oversize 4.0008 – 4.0014 4.0002 – 4.0008 (HP)
Piston to Cyl. Bore clearance 0.0018 – 0.0026 0.003 – 0.0038 (HP)
Piston Pin Bore Dia. 0.9123 – 0.9126 0.9123 – 0.9126 (HP)

Valve Specifications

Year 1968
Seat angle Intake 30, Exhaust 45
Face angle Intake 29, Exhaust 44
Valve spring pressure lbs/inches 268 @ 1.31
Valve spring installed height (in) 1 13/16
Stem guide clearance (in) – Intake 0.0010 – 0.0024
Stem guide clearance (in) – Exhaust 0.0020 – 0.0034
Stem Diameter (in) – Intake 0.3715
Stem Diameter (in) – Exhaust 0.3705
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