By The Numbers
'70 Pontiac Trans Am
Steve Coombes, 60
Liberty Hill, TX
| Engine |
| Type: | Pontiac 505 |
| Block: | IA2 aftermarket block,
bored to 4.350 inches |
| Oiling: | Melling oil pump, Canton six-quart pan |
| Rotating assembly: | Crower 4.250-inch billet crank,
Eagle 6.800-inch big-block Chevy steel rods,
forged 10.0:1 JE pistons |
| Cylinder heads: | Edelbrock Performer RPM
aluminum castings ported to flow 330/250 cfm
at .700-inch lift, Ferrea 2.15/1.77-inch valves |
| Camshaft: | Crower 260/266 at .050 solid roller,
.701/.680-inch lift, 110-degree LSA |
| Valvetrain: | Crower offset lifters,
Sims Performance roller bearing retainer plate,
T&D shaft-mount rockers |
| Induction: | Edelbrock Victor intake manifold,
Holley 950-cfm carb built by Precision Racing Components |
| Ignition: | MSD Pro-Billet distributor, coil,
and Digital 6 box; Taylor plug wires |
| Fuel system: | Aeromotive A1000 pump,
Mallory five-port pressure regulator,
Jaz 16-gallon fuel cell |
| Exhaust: | Hedman 2-inch headers,
Dr. Gas 3.5-inch X-pipe collectors,
dual DynoMax 3-inch mufflers |
| Cooling: | Meziere water pump,
aluminum crossflow radiator,
dual Perma-Cool electric fans
with custom shroud |
| Output: | 642 hp at 6,000 rpm
and 640 lb-ft at 4,600 rpm |
| Built by: | CHS Racing Engines (Austin, TX) |
| Drivetrain |
| Transmission: | GM TH200-4R trans,
3,500-stall converter,
B&M Quicksilver shifter,
Earl’s trans cooler |
| Rear axle: | GM 12-bolt rearend,
Moser 30-spline axles,
3.73:1 gears, Auburn posi |
| Chassis |
| Front suspension: | Global West upper
and lower control arms,
Edelbrock shocks, custom 1-inch sway bar,
Moog six-cylinder replacement springs |
| Rear suspension: | Landrum 300 lb/in leaf springs,
Edelbrock shocks,
CalTracs traction bars,
custom subframe connectors |
| Brakes: | Wilwood 10.75-inch discs, front;
Wilwood 11-inch discs, rear |
| Wheels & Tires |
| Wheels: | American Racing Torq-Thrust D
15x6, front; 15x8.5, rear |
| Tires: | Firestone 215/65R15, front;
Nitto 275/60R15 drag radials, rear |