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ZZ427/480 High Performance Engine Specifications and Key Component Details:
Displacement: ............................................................. 427 cubic inches
Bore x Stroke: ............................................................. 4.250ʺ diameter x 3.70ʺ stroke
Deck Height: ............................................................... 9.80" from crankshaft centerline
Horsepower Rating: .................................................... 480 HP @ 5800 RPM
Torque Rating ............................................................. 490 ft.lbs. @ 3800 RPM
Block: .......................................................................... Cast iron, four-bolt intermediate mains, one piece rear seal
Crankshaft: ................................................................. 4340 forged steel with a one-piece rear seal design. Internally
.......................................................................... balanced with 3.766ʺ stroke
Balancer: .................................................................... SFI approved high performance
Connecting Rods: ....................................................... 6.135" center to center. Forged 4340 steel
Pistons: ....................................................................... Forged aluminum with dome
Piston rings: ................................................................ Plasma-moly ring top ring, cast iron 2nd ring, standard
.......................................................................... tension oil ring
Compression Ratio: .................................................... 10:1 nominal
Intake Manifold ........................................................... Aluminum dual plane for 4150 series carburetors
Cylinder Heads: .......................................................... Aluminum oval port with stainless steel valves
Valve Diameter (Intake/Exhaust): ............................ 2.19ʺ/1.88ʺ
Chamber Volume: ................................................... 110cc
Ovate (Beehive) Valve Springs ............................... 155 lbs. seat pressure at 1.880ʺ installed height
Camshaft: ................................................................... Hydraulic roller tappet
Valve Lift: ................................................................. .527ʺ intake and .544ʺ exhaust
Duration: .................................................................. 224° intake, 234° exhaust @ .050ʺ lift
Centerline: ............................................................... 110° LSA
Rocker Arm Ratio: ...................................................... 1.7:1, Aluminum roller rocker
Timing Chain: ............................................................. Heavy duty single roller design
Oil Pan: ....................................................................... 6 - quart Gen VI
Oil Filter: ..................................................................... AC Delco part # - PF1218
Valve Lash .................................................................. 1/2 turn down from zero lash
Carburetor .................................................................. 770cfm four-barrel with vacuum secondary circuit and
.......................................................................... electric choke
Fuel: .......................................................................... Premium unleaded - 92 (R+M/2)
Oil Pressure (Normal): ................................................ 50-55 psi @ 1500 RPM
Firing Order: ............................................................... 1-8-4-3-6-5-7-2
Maximum Engine Speed: ........................................... 6500 RPM
Spark Plugs: ............................................................... AC Delco R45XLS, .035ʺ gap
Distributor ................................................................... High Energy Ignition (HEI) billet aluminum
Ignition Timing ............................................................ 10°-12° base timing
34°-36° total timing
Water Pump ................................................................ Short leg aluminum pump
Flex plate .................................................................... 14ʺ automatic transmission flexplate (internal balance)
ZZ427/480 (19166393) Deluxe Specifications
TITLE
19211813
REV 15JA15
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