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Pontiac Pavement Pounders Shootout - Mid-Michigan Motorplex Part III

1970 Gto Judge Side View
Gto Engine Top View Mark Weymouth Front View
STRIP TUNING LOG
Run/TuningLaunch RPMShift Pt. 60-ft.1/8-mile1/4-mile
1. 40-deg timing
42 psi in rear tires
"K" hanger
2,8006,0002.288.45/89.5712.80/113.53
2. 40 psi in rear tires3,5006,0002.078.15/90.0312.49/113.57
3. Same3,3006,0002.118.19/90.2212.51/114.01
4. Same4,0006,0002.088.16/90.3712.48/113.95
BEST PASS CORRECTED12.25/116.05
5. Same4,2006,0002.118.20/90.0812.53/113.96

STRIP SPECS
Year/Model'70 R/A-IV GTO Judge
Race Weight with Driver3,880 lbs
Curb Weight3,685 lbs
Fuel Level When Last Weighed½ tank
FuelTurbo Blue 110 or VP 110
EngineR/A-IV 400, '70 SR
Cubic Inches Before/After400/412
Engine Built ByDynamic Speed & Marine and the owner

Induction System
Air CleanerK&N factory replacement
Carburetor7040273 750-cfm Q-jet
Primary Jets0.073-in
Primary Metering Rods0.039-in
Secondary Metering RodsDR
Secondary Metering Rod HangerF
Intake ManifoldFactory two-piece aluminum

Fuel System
PumpCarter high-flow
LinesFactory 3/8-in

Heads
Casting No. .614 R/A-IV '70
Flow Numbers231/181-cfm at 25-in of pressure
ValvesManley SS NHRA stock class legal race, 2.11/1.77-in

Bottom End
PistonsDiamond forged, 0.060-over, 2.8cc reliefs
RingsDiamond file-fit
RodsOliver forged NHRA stock class replacements, 6.625-in
Compression Ratio12.13:1
CrankshaftStock Pontiac N, 3.75-in stroke
Rotating Assembly BalancedYes

Camshaft
BrandMelling hyd. 041 factory replacement
Duration at 0.050, Intake/Exhaust231/240-deg
Duration Advertised308/320-deg
Lift with Specified Rocker Arms, Intake/Exhaust0.516/0.516-in
Lobe Separation Angle113.5-deg
Installed PositionStraight up
Rocker ArmsNOS 1.65:1 stamped steel

Ignition
Distributor1112011 GM points
AmplifierNone
CoilFactory GM
WiresDate-coded 7mm restoration wires
SparkAC 45S
Total Timing39-deg
Rpm That Total Timing Is Reached2,400

Exhaust
ManifoldsFactory A-body Ram Air
Exhaust Pipes2.5-in
MufflersMagnaFlow
CrossoverX-type

Drivetrain
TransmissionM21 Muncie
ClutchCenterforce Dual-Friction
ShifterFactory Hurst
RearBOP 10-bolt
Rear Gear Ratio4.33:1
PosiOriginal 4-pinion

Chassis and Suspension
Brakes F/RStock 9.5-in manual drum/drum
Wheels F/R14x7 Rally IIs
Tires F/RF70-14 Firestone Wide Oval
Tire Pressure F/R50 psi/42psi
Suspension Front
SpringsOriginal GM coil
Control ArmsOriginal GM
Stabilizer BarOriginal GM 1.125-in
ShocksOriginal Delco spiral
Other featuresPolygraphite bushing
Suspension Rear
SpringsOriginal GM coil
Control ArmsBoxed R/A-IV
Stabilizer BarOriginal GM 0.0875-in
ShocksOriginal Delco spiral
Other featuresHop Stop bars
Chassis ModsNone

The Rest
Interior ModsNone
Safety ModsDriveshaft loop
PaintPepper Green with green, yellow,
white stripes and Judge decals
Launch Technique3,200 rpm and ride the clutch out
Best 1/8-mile ET/MPH Prior to Event7.90/90+
Best 1/4-mile ET/MPH Prior to Event12.21/115.13


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