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ANNIVERSARY EDITION 427 High Performance Engine Specifications and Key Component Details:
Displacement: ........................................................................... 427 cubic inches
Bore x Stroke: ............................................................................ 4.250ʺ diameter x 3.766ʺ stroke
Deck Height: ............................................................................... 9.80" from crankshaft centerline
Horsepower Rating .................................................................... 430 HP @ 5800 RPM
Torque Rating ............................................................................. 444 ft. lbs. @ 3800 RPM
Block: ........................................................................................ Cast aluminum with steel liners, four-bolt intermediate mains
............................................................................................. with splayed outers, 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: .................................................................................... .527" intake and .544ʺ exhaust
Duration: ..................................................................................... 224° intake, 234° exhaust @ .050" 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 # - PF35L
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)
Anniversary Edition 427 (19166392) Specifications REV15JA15
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