| BY THE NUMBERS |
| '72 Pontiac Trans Am |
| Bob Bertelsen, 49 |
| Columbiana, OH |
| ENGINE |
| Type: |
GM L99 small-block |
| Block: |
factory block bored to 4.070 inches |
| Oiling: |
Melling oil pump, factory GM pan |
| Rotating assembly: |
Callies 4.000-inch forged |
| crank and 6.125-inch steel rods; |
| Mahle 11.2:1 pistons |
| Cylinder heads: |
factory L99/LS3 aluminum |
| castings with Mast 1.290-inch |
| beehive valvesprings |
| Camshaft: |
Mast 230/237-at-.050 |
| hydraulic roller, .588/.607-inch lift, |
|
111-degree LSA |
| Valvetrain: |
Mast cam phaser restrictors; |
|
stock lifters and rockers |
| Induction: |
GM L99/LS3 intake manifold |
| and throttle body |
| Ignition: |
stock coils, MSD spark plug wires |
| Fuel system: |
custom tank, |
| Aeromotive pump and regulator |
| Exhaust: |
Sanderson 1.75-inch headers, |
| custom 2.5-inch H-pipe, dual Flowmaster mufflers |
| Cooling: |
stock water pump, custom shroud; |
| Flex-A-Lite radiator and dual electric fans |
| Output: |
575 hp at 6,300 rpm |
| and 540 lb-ft at 4,600 rpm |
| Built by: |
Mast Motorsports |
| DRIVETRAIN |
| Transmission: |
Bowler 4L80E trans and |
| 2,200-stall converter; |
| Cadillac DTS shifter |
| Rear axle: |
Chassisworks 9-inch rearend |
| with Moser 31-spline axles |
| and 3.25:1 gears |
| CHASSIS |
| Front suspension: |
DSE front |
| subframe assembly, control arms, |
| coilovers, and sway bar |
| Rear suspension: |
DSE four-link |
| and coilovers |
| Brakes: |
Baer 14-inch discs with |
| six-piston calipers, front; |
| Baer 13-inch discs with |
| six-piston calipers, rear |
| WHEELS & TIRES |
| Wheels: |
Rushforth Night Train |
|
19x10, front; 19x12, rear |
| Tires: |
Nitto Invo |
|
275/30R19, front; 345/30R19, rear |