Pontiac Forum - Pontiac Discussion Forums - PA: 1978 Pontiac Trans Am 478 CID, EFI, 200 Mph “G” Machine

SOLD!!

1978 Pontiac Trans Am 478 CID, EFI, 200 Mph "G” Machine.
Needs repair, Have parts. $6000

This T/A started life as……..
VIN: 2W87Z8N144151
Color: Gold over Deep Met Brown
1 Owner since new, Garage kept, Never driven in winter. Is rust Free!
Has All factory options. Fisher T Tops, WS6 Performance Pkg, 2.2 Turn Steering, Plush

interior, Power Everything, Tilt, Cruise Etc. Cost $11,800 in 1978. Basic T/A's were $5,700.

How it became a 200 mph G Machine w/a 5.2:1 Weight to Power Ratio.

Chassis:
-100+ hours of seam welding, gusseting and re-enforcing the front sub-frame to prevent flex

and deflection.
-Channeled and lowered body is welded around fabricated full frame. Including Interior

low-cage. This more than replaces the strength lost to the T Tops and Lowers the car 2

inches without losing ground clearance. Adding stability and lowering wind resistance.
-This car can be launched without consequence or damage.
-Rancho Springs, Heavy Adjustable Sway Bars and Links. Urethane Sway Bar Bushings.
-Bilstein Performance Shock Absorbers
-WATTS link centering and stabilizing the differential. Removing all side-to-side

deflection.
-Spring Perch on rear springs raised 1” to prevent axel wrap & improve launch.
-16”x9” Enkie Aluminum wheels to fit 255/50/16 Z rated tires.
-Body is Clearenced to fit this size tire and retain full suspension travel.
-Battery is relocated to the trunk for weight distribution.
-Fully Functional Fresh Air Shaker Hood
-Functional 200 Mph Speedometer
-Thermostatically controlled electric cooling fans.
-3 Stage Headlights. Low, Hi and Super Hi to 600 watts

Interior:
-Premium Camel Velour with ALL the options and amenities. Tilt Wheel, Cruise, Power Windows,

Door Locks, Rear Defrost, Navigation Lights, AC, Pulse Wipers and All Gauges.
-All is in Excellent Shape. No Fading, Cracking or Tears, None. The door handles and console

cover are not broken.
-The car never sat in the sun. It has been garaged kept since new.

Stealth:
-It can Out Run Anything chasing it.
-Tinted Tail Light Covers cut down overall lumens and do not reflect.
-Switches for lighting control. Brakes, Running, Parking Etc.
-Chrome is all Blacked Out to reduce reflection.

Drive Train:
-Engine:
-Only 15k miles!
-476 CID EFI Calculated 750hp and 750ft.lbs. Torque Without NOS!! at 4800 Rpm, 6500 Redline
-455 CID Pontiac Block, Magna Fluxed, Ultrasonic Cyl Thickness Tested, Line Bored, Decked to

Square and Bored 0.030 over.
-9.75 Compression Ratio, Runs on 93 or 94 Pump Gas
-Forged Crank Stroked +0.040 This brings the Pistons to Deck, Increases displacement,

compression and torque. Balanced.
-Forged TRW Flat top pistons.
-Chrome Molly TRW rings
-Stainless Manley Valves & Springs.
-Silicone Impregnated Bronze Valve Guides
-Ported, Polished and Flowed Heads
-Crower Roller Tipped 1.7 rocker arms.
-Crane Ram Air IV Grind Cam.
-GM Hi Rev Hydraulic Lifters.
-Crane True Double Roller Timing Chain
-Hi Performance TRW Push Rods.
-Holly 900 CFM Pro Jection 4 Fuel Injection.
-Edelbrock Performer Intake Manifold, drilled and tapped for NOS install.
-Hi Performance TRW Oil Pump.
-Hi Performance Rod, Main and Head Bolts
-Hi Performance Recurved GM HEI Ignition with Accel Super Coil.
-Engine is Completely Balanced
-8 Quart Lunati Oil Pan with Baffles and Trap Doors for Oil Retention.
-2 Quart Pressurized Oil Reservoir to protect against Pressure loss during 1+ G Cornering

maneuvers.
-Neoprene Rear Main Seal Napa Pt # 1495168 Replaces Stock Pontiac Rope Seal.
-Block is fitted for Remote Oil Filters and Cooler Lines.

Transmission:
-GM TH 400 Built by Steve's Racing Transmissions in Stillwater NJ. His 900 Hp Model with a

Converter for a 427 L88 Corvette for proper stall and lockup speeds. It takes off like a

slingshot.
-Shift points are set to maximize performance with this engine. The car will break traction

at each shift if desired every time.
-Full Power Shift points are 5900 1st to 2nd @ 75mph and 5700 2nd to 3rd @ 135 mph. From

there it starts going fast.
-Hi Capacity Sump Aids Cooling and holds 3 extra qts trans fluid.
-Conversion from the stock TH 350 includes the proper Pontiac Cross Member, Driveshaft,

Downshift Mechanism and Solid Lakewood U Joints.
-Speedometer gears have been corrected for accuracy.
-Hi Performance Ratchet Shifter is one of the GM Options.

Differential:
-GM 2.41:1 True Positraction
-GM 3.23:1 True Positraction Is also included if you want a low ratio. Even with the 2.41

gear it has more torque than traction with 10” SCCA Slicks. With this power to weight and so

much torque a short gear is unnecessary.

Brakes:
-Front Disks are Drilled and Force Cooled with 2” Tubing to Backing Plate ducted from the

front air dam.
-Rear Drum Faces also drilled for cooling.

Damage:
-Car was run into a wall on the right front corner at about 25 mph. It needs the subframe,

windshield and sheet metal replaced. Most all parts are Included.

Parts Included:
-Second 1978 WS6 Trans/Am less engine and transmission. Otherwise complete. It is a sister

car with 15X8 WS6 Pontiac Snowflake Wheels. All sheet metal to make repairs is included. It

has been disassembled and is in dry storage.
-Fully Prepared, Seam Welded, Gusseted and Reinforced Sub Frame. Ready to Install.
-Spare 455 block & Crankshaft
-Spare 3.23:1 Posi Differential
-125 HP NOS System. Never Installed. Would put Hp at about 875. It was never necessary to

use it.

Contact me if you have any other questions!