Cobra 427 - 427 High Performance Engine Specifications; General Engine Specifications; Crankshaft and Camshaft Specifications; Valve System and Ignition System

427 HIGH PERFORMANCE ENGINE SPECIFICATIONS
GENERAL
EXHAUST VALVES
Type
8-cylinder 90° Vee,
Material 21-4N Forged Steel
Overhead Valve
with-Chrome Plated
Displacement
427 Cubic Inches
Stem and Sili-
Bore and Stroke
4·2328" x 3,784"
chrome tip
Compression Ratio
11'1 :1
Overall Length
5·246"
Brake Horsepower
4V-41O @ 5600
Overall Head
1·723
H
-I·733"
r.p.m.
Diameter
8V-425 @ 6000
Angle of Seat and
44°
r.p.m.
Face
Valve Lifters
Solid
Lift
0'298" at Valve
Carburettor
Two 4-venturi
Spring Pressure and
80-90Ibs. @ 1·82"
Fuel
Super Premium
(valve closed)
Exhaust
Dual
255-28P Ibs. @ 1·32'
(
Cylinder Block
Precision-Cast Iron
(valve open)
Material
Cylinder Head
Precision-Cast Iron
PISTONS
Material
Material
Extruded Alumin-
Oil Filter
Rotunda 6000 Mile
ium Cam, Ground
Type-Part Number
Weight
23·31 oz.
CIAZ-6731-A
PISTON RINGS
High Performance
(RI-A)
No. I Compression
Cast Iron Alloy
425 @ 6000 Brake
V-8 (8-V)
Horsepower
Chrome Plated
High Performance
480 @ 3700 Torque
No.2 Compression
Cast Iron Alloy
V-8 (8-V)
Chrome Plated
No.3 Oil Control
MulH Piece-Two
CRANKSHAJIT
Chrome Plated Steel
Rails and One Blued
Material
Precision-Molded
Steel Expander
Main Bearings (5)
Alloy Cast Iron
Width-s-No. I
0'077 4"-0·078 I"
Steel-Back Copper- No.2
0'0930"-0,0940"
Lead Alloy Replace- Gap-Nos. I and 2
0,010"-0,020"
Main Bearing Jour-
able Inserts
No.3
0·015"-0,055"
2,7484"-2'7492"
nal Diameter
PISTON PINS
Thrust Bearing
No.3
Type
Full Floating
Crankpin Journal 2'4380"-2-4388"
Tubular
Diameter
Material
S.A.E. 5015 Alloy
Steel Heat Treated
CAMSHAFT
Length
2'202'-3'212"
Material
Precision-Molded
Diameter
0,9750"-0,9753"
Special Alloy Iron
Bushing
Bronze
Bearings (5)
Steel-Back Babbitt
CONNECTING RODS
Inserts
Material
Forged Steel with
Camshaft Gear
Molded Nylon on
separately Forged.
Material
Aluminum Die Cast
Caps
VALVE SYSTEM
Weight
26'85-27·30 oz.
Length
6,486"-6,490"
Operating Tappet
0'025 (hot)
Centre to Centre
Clearance
Intake Valve Opens
0·006 @ 48° BTDC
CONNECTING ROD BEARINGS
Intake Valve Closes
0'008 @ 96° ABDC
Material
Steel-Back Copper-
Duration
324°
Lead Alloy Inserts
Exha ust Valve Opens
0·006 @ 96° BBDC
Overall Length
0'736
H
-0'746"
Exhaust Valve Closes
0'008 @ 48° ATDC
Clearance Limits
0·00))" -0'0032
H
Duration
324°
(
Valve Opening
96°
GENERAL
Firing Order
1-5-4-2-6-3-7-8
INTAKE VALVES
Valve Clearance
0·028 cold-0'025 hot
Material
Special Alloy Valve
Cam Lobe Lift
0·298
(normal)
Steel with Alumin-
Cam Lobe Wear 0'005
Overall Length
ium Coated Head·
Limit
5·446"
Valve Lift (theor- 0'500
Overall Head
2,022"-2'037"
etical zero lash)
Diameter
Compression pres-
160-200 p.s.i.
Angle of Seat and
29°
sure (sea level)
Face
Life
0·500" at valve
IGNITION 1>YSTEM
Spring Pressure and
80-90 lbs. @ ),82"
Initial Ignition 8° BTDC
Length
(valve closed)
Timing (New Points)
255-280 lbs. @ )'32"
Final Ignition 8° BTbC
(valve open)
Timing (tune-up)
54