By The Numbers

1974 Pontiac LeMans

Tim Smith, 45, Chatham, VA


Type: Pontiac 350

Displacement: 365 ci (.060-over)

Block: factory, 1974 vintage

Bore & stroke: 3.935x3.75 inches

Compression ratio: 10:1

Rotating assembly: OEM cast-iron crank and rods, Sealed Power forged pistons

Cylinder heads: OEM cast iron, ported and polished by Taylor’s Engines (Providence, NC)

Camshaft: COMP Cams hydraulic flat-tappet Thumpr; 235/249 degrees at .050, .490/.475-inch lift

Valvetrain: 2.11-/1.66-inch valves, 7⁄16-inch screw-in studs, COMP Cams valvesprings, COMP Cams 1.5 ratio aluminum roller rockers, stock pushrods

Intake manifold: Edelbrock Performer

Carburetor: Edelbrock 650-cfm Thunder Series

Exhaust: FlowTech 1.625-inch primary ceramic-coated long-tube headers, 3-inch collectors, 2.5-inch dual exhaust into Flowsound 2.5-inch mufflers and Trans Am dual tips

Oiling: Melling oil pump

Ignition: GM HEI

Cooling: stock water pump and radiator

Output: approx. 400 hp

Built by: Tim Smith


Transmission: factory Turbo 350 three-speed automatic

Torque converter: B&M Holeshot, 2,500-rpm stall speed

Rearend: factory 8.5-inch Positraction 10-bolt with 3.73 ring-and-pinion


Frame: factory perimeter frame A-body

Front suspension: factory radial-tuned suspension (RTS), double A-arm, new factory coil springs, factory antisway bar

Rear suspension: factory triangulated four-link radial-tuned suspension, new factory heavy-duty station wagon springs for hauling ’shine

Steering: factory recirculating-ball sector-gear steering box

Brakes: factory 11-inch discs and D-52 calipers, front; factory drums, rear

Wheels & Tires

Wheels: steel 15x8 Pontiac Rally wheels

Tires: Cooper Cobra; 225/70R15, front; 275/60R15, rear; ’cause not all roads are paved