‘71 Pro-Touring Chevelle Engine Specifications & Other Data:

 

ZZ 540 Technical Information

Horsepower

TBD during break-in dyno runs, AC Performance, Colchester, VT

(Best estimate is between 675-725 HP)

Torque

TBD during break-in dyno runs

(Best estimate is over 600 ft. lbs. thru all of the powerband RPM range)

 

 

Compression Ratio

9.32:1

Block

GMPP Gen 6 Big Block Chevy, P/N: 10237292 Cast iron - four bolt main caps

Crankshaft

Callie’s RaceMaster  4340 Non-Twist 4.250” stroke, internal balance

Connecting Rods

Eagle 3D H-Beam, 4340 with ARP 7/16" bolts

Crankshaft Studs

 

Pistons

ARP Main Stud Kit w/washers

 

SRP Forged Aluminum, Flat Top design, single -3CC eyebrow notch

Piston Rings

Sealed Power, Moly design

Camshaft

Comp Cams Hydraulic Roller SEE CAM CARD

Timing Chain

Cloyes Hex-Adjust Single roller

Cylinder Heads

AFR 335CNC Square Port

Intake Valves

2.300" Stainless Steel

Exhaust Valves

1.88" Stainless Steel

Valve Springs

AFR with matched spring pressures for hydraulic roller camshaft

Rocker Arms

Comp Cams full roller design, Stainless Steel, Std 1.7:1 ratio

Intake Manifold

Aluminum Holley – Fuel Injectors pre-plumbed

Induction System

Holley Commander 950 MPFI Kit w/42 lb./hr. injectors & 1,000 cfm billet throttle body

Distributor

MSD Pro Billet, Electronically controlled by Holley Commander 950 ECU

Starter

Gear Reduction, Mini Starter design by Summit Racing

Water Pump

Stewart Aluminum Pump, included with Vintage Air’s FrontRunner Kit

 

Valve Lash

Hydraulic Camshaft, on base circle of lobe remove play & add ½ turn of pre-load

 

Spark Plugs

AFR-recommended Autolite AR3932, .750” reach, 5/8” hex drive, 14MM threads

Fuel

93 octane pump gas

Ignition Timing

8º BTDC @ 800 RPM
36º Total @5000 RPM

Technical Notes: