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Strip Specs
Year/Model: ’70 LeMans
Race Weight With Driver: 3,650
Curb Weight: 3,400
Fuel Level When Weighed: 1⁄2 tank
Fuel: 93-octane
Engine: ’75 400
Cubic Inches Before/After: 400/406
Engine Built By: Owner
Induction System
Air Cleaner: None
Carburetor: 800-cfm Quadrajet
Jets: . . 0.068 primary (no primary metering rods), K hanger with DC secondary rods
Spacer Plate: 1-inch, home-made, wood
Intake Manifold: Edelbrock Performer RPM
Fuel System
Pump:
Carter, set to 7 psi
Lines:
Stock
Regulator: None
Heads
Casting: ’75 6X-6
Head Porting: Port-matched, angle-milled 0.085-in
Flow Numbers: Unknown
Valves: Ferrea stainless steel, 2.11/1.77-in
1971 Pontiac Gto 1970 Pontiac Lemans Engine
Bottom End
Pistons: Speed Pro forged, 0.102-in dome
Rings: Total Seal, file-to-fit, 5⁄64, 5⁄64, 3⁄16
Rods: Stock
Compression Ratio: 10.97:1
Crankshaft: Stock, 3.75-in stroke
Rotating Assembly Balanced: Yes
Camshaft
Brand: Ultradyne hydraulic flat-tappet
Duration at 0.050: 236-/242-deg
Duration Advertised: N/A
Lift with Specified Rocker Arms: 0.538-/0.546-in
Lobe Separation Angle: 110 deg
Installed Position: -4 deg
Rocker Arms: Harland Sharp, 1.5:1
Ignition
Distributor: GM HEI
Amplifier: None
Coil: Pertronix
Wires: MSD 8mm
Spark Plugs: Bosch
Total Timing: 36-deg
Rpm That Total Timing is Reached: 2,800
Exhaust
Headers: Hedman
Primaries: 1.75-in
Collectors: 3.00-in
Exhaust Pipes: None
Mufflers: None
Crossover: None
Drivetrain
Transmission: Turbo 400
Converter: TCI 9-in, 3,600-stall
Shifter: B&M Pro Stick
Rear: Chevy 12-bolt
Rear Gear Ratio: 4.33
Spool: Moser
Axles: Moser, 33-spline
Chassis and Suspension
Brakes F/R: Stock Drum
Wheels F/R: 15x3.5, 15x8
Tires F/R: MT ET Fronts/ Goodyear 28x9x15
Tire Pressure F/R: 45 psi / 15 psi
Suspension Front
Springs: Stock replacement
Shocks: Competition Engineering 90/10
Control Arms: Stock
Stabilizer Bar: None
Other Features: None
Suspension Rear
Springs: Moroso Trick
Shocks: Competition Engineering single-adjustable, set on full soft
Control Arms: Stock upper w/no-hop bars, boxed lower
Stabilizer Bar: Stock
Other Features: None
Chassis Mods: None
The Rest
Interior Mods: Auto Meter tachometer, Summit gauges
Exterior Mods: None
Safety Mods: Driveshaft loop, fuel-cut off, rear battery disconnect
Color: Sierra Yellow/ Tan vinyl top
Launch Technique: Footbrake to 2,500-3,300 rpm
Best 1/8-mile ET/MPH Prior to Event: 7.33/99.62
Best 1/4-mile ET/MPH Prior to Event: 11.79/114.21
1971 Pontiac Gto 1970 Pontiac Lemans Ed Deel
Ed Deel
Ed, a 56-year-old supervisor, has been racing off and on for 40 years. His LeMans was a gift from his son in 2001. His favorite moment in it was “winning Modified class at the Ames Performance Tri-Power Pontiac Nationals in 2007.” Though this is his only Pontiac, he previously owned an ’04 Grand Prix GTP.
Strip Tuning Log
Run/Tuning Launch RPM Shift Point 60-ft. 1/8-mile 1/4-mile
1. 36-deg timing, all in at 3,200 rpm, 0.068 primary jets, rear shocks set to medium soft, 17 psi in rear tires 2,500 5,400 1.62 7.50/90.76 11.86/111.45
Best Pass Corrected 11.60/113.97
2. 16 psi in rear tires 4,000 5,400 1.66 7.64/89.36 12.06/109.90
3. Rear shocks set to full soft, 16.5 psi in rear tires 2,200 5,400 1.62 7.60/88.35 12.06/109.19
4. 17 psi in rear tires 2,500 5,400 1.60 7.53/89.60 11.96/109.85
5. Lowered all-in to 2,900 rpm, 15 psi in rear tires 2,000 5,400 1.67 7.62/88.62 12.04/110.17
Run Notes: 1) Hooked ok; 2) Bad wheelspin; 3) Hooked ok; 4) Hooked good; 5) Bad wheelspin.
Conclusion
Both of our Shootout participants came to the track to evaluate recent changes they’ve made to their Pontiacs.
Mike learned that his A-body reacted favorably to the diet, and the front skinnies alone shaved 0.1 second off his e.t.
Ed learned that his new smaller-width Goodyears, full-soft rear shock settings, and new launch rpms did not help his performance. He’s going to go back to a wider tire, stiffer shock settings, and his old launch technique.
Like the racers in this Shootout, you may want to evaluate the effect new speed parts have on your e.t’s. Maybe you’ll find they produce better performance, like Mike did; maybe you’ll decide you’re better off with what you had, like Ed learned. No matter your results, we’re sure the cars and combos detailed in this story will give you plenty of ideas for your project.
