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Pure-Stock Shootout Part VI - Pontiac Pavement Pounders

Engine Battles Gto Engine Battles 350 Ho Engine Battles Charles Lombardi
Strip Tuning Log
Run/TuningLaunch RPMShift Pt.60-ft.1/8-mile1/4-mile
1 Baseline tune2,2005,0001.908.18/87.1112.69/109.10
2 Same2,4005,200/5,0001.928.12/87.5312.62/109.59
3 Same2,6005,0002.108.31/87.9712.78/110.34
4 Same2,6005,2001.968.16/87.0312.68/108.90
5 Same2,6005,0001.908.10/87.9112.58/111.05
Best Pass Corrected12.35/113.10
Run Notes: 1) Car hooked well, car warm; 2) Shifted earlier, car hot; 3) Launch rpm raised and tires spun; 4) Car hooked well, higher shift rpm not good for 2-3 shift; 5) Track was great, rolled into the throttle faster

Strip Specs
Year/Model’71 GTO 455 H.O.
Race Weight With Driver3,845 lbs
Curb Weight3,690 lbs
Fuel Level When Last Weighed½ tank
FuelVP 110-octane
Engine Size’71 455 H.O., code YE
Cubic Inches Before/After455/462
Engine Built ByGlasgo & Co.

Induction System
Air CleanerOEM dual-snorkel
CarburetorNOS 1971 Q-Jet
Primary Jets0.074-in
Primary Metering Rods0.043-in
Secondary Metering RodsCC
Secondary HangerG
Intake ManifoldOEM aluminum

Fuel System
PumpAC Delco
Lines3/8-in

Heads
CastingNo. 197, OEM virgin
Head PortingNone
Flow NumbersN/A
ValvesStock GM 2.11/1.77-in

Bottom End
PistonsRoss forged, +0.030-in, domed
RingsChilds & Albert Z-gap
RodsEagle forged, 6.625-in
Compression Ratio9.9:1
Crankshaft: OEM nodular iron, 4.210-in stroke
Rotating Assembly BalancedYes

Camshaft
BrandBullet Cams hydraulic
Duration at 0.050212/225-deg
Duration Advertised288/302-deg
Lift with specified rocker arms0.425/0.425-in
Lobe Separation Angle112-deg
Installed Position109-deg
Rocker ArmsCrane 1.50:1

Ignition
DistributorOEM points-type
AmplifierNone
CoilPertronix
WiresPertronix
Spark PlugsAC R43S
Total Timing38-deg
RPM That Total Timing is Reached2,200

Exhaust
ManifoldsOEM H.O.
Exhaust Pipes2.5-in
MufflersDynoMax Ultra-Flo
CrossoverPypes X-type

Drivetrain
TransmissionOriginal Turbo-400
ConverterGM 2,000-rpm stall
ShifterStock
RearGM 12-bolt
Rear Gear Ratio3.55:1
PosiOEM
AxlesMoser Engineering

Chassis and Suspension
Brakes F/RStock disc/drum, manual
Wheels F/R14x6-in Rally II
Tires F/RGoodyear G70-14
Tire Pressure F/R45 psi/40 psi
Suspension Fr: 
SpringsMoog coil
Control ArmsStock
Stabilizer BarStock 1.125 in
ShocksAC Delco
Suspension Rr:  
SpringsOriginal
Control ArmsStock
Stabilizer BarStock
ShocksACDelco
Chassis ModsNone

The Rest
Safety ModsNone
PaintDuPont Chroma Base two-stage
Launch TechniqueBrake torque to 1,800, converter flashes to 2,200 rpm
Best 1/8-mile E.T./MPH prior to event7.94/89.20
Best 1/4-mile E.T./MPH prior to event12.42/110.8


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Pontiac G6 Research
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