By The Numbers
1970 Pontiac Firebird
Thomas Cronkright, 36 Grand Rapids, MI
Engine
Type: Pontiac 455
Block: Butler aluminum block bored to 4.250 inches
Oiling: Melling oil pump, Canton seven-quart pan
Rotating assembly: Eagle forged 4.000-inch crank and rods; custom Ross 8.5:1 pistons
Cylinder heads: Kauffman aluminum castings with 2.200/1.700-inch valves and 64cc chambers CNC ported to flow 380 cfm
Camshaft: COMP Cams custom hydraulic roller
Valvetrain: COMP Cams valvesprings, lifters, retainers, and timing set
Induction: custom billet Visner intake manifold, dual 4-inch throttle-bodies, twin 66mm Bullseye turbochargers, custom air-to-air intercooler, Tial 44mm wastegates and blow-off valves
Fuel system: Rick’s Hot Rod Shop tank; Aeromotive Eliminator pump and regulator; FAST XFI stand-alone computer and twin injectors per cylinder
Ignition: MSD 6AL box, Mallory distributor
Exhaust: custom stainless steel turbo headers, X-pipe, and dual 3-inch MagnaFlow mufflers
Output: 1,020 hp at 5,900 rpm at 12.5 psi
Built by: All Speed Customs
Drivetrain
Transmission: Rockland T56 Magnum six-speed trans, Ram twin-disc clutch, Kiesler shifter
Rear axle: Moser 12-bolt rearend, 3.55:1 gears, Detroit TrueTrac limited-slip differential
Chassis
Front suspension: Detroit Speed and Engineering upper/lower control arms and sway bar; QA1 coilovers; Classic Performance Products 2-inch drop spindles
Rear suspension: DSE four-link, sway bar, and coilovers
Brakes: Wilwood 14-inch discs with six-piston calipers, front; Wilwood 13-inch discs with four-piston calipers, rear
Wheels & Tires
Wheels: Forgiano Ritorno 19x10, front; 20x12.5, rear
Tires: Nitto NT05 275/30R19, front; 315/35R20, rear
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