t’s hard to pull off the sleeper look with a car that most people consider a muscle car. The ’72 Chevrolet Chevelle seen here certainly fooled us on first inspection, but all bets were off when we saw it make a pass down the dragstrip on a heavy dose of nitrous oxide. Shannon Medley bought the car several years ago and built it as a fun project that he could drive on the street and take to the track. When he bought it, the car was so nice that he hated to make it a serious race car, so he did what he could to retain the car’s original appearance. That’s part of what plays into the car’s sleeper theme—green on green with a bench seat isn’t exactly the most common go-fast combination.
Shannon has toyed with several different wheel-and-tire combinations on the Chevelle and has run a best of 6.32 at 106 mph in the eighth-mile on a set of Weld Draglite wheels and Mickey Thompson bias-ply slicks. This combination totally ruins the sleeper look, so he rarely runs it, even though it’s a 1/2 second quicker than the sleeper whitewall and hubcap setup. By the way, the whitewalls are just painted onto a pair of tiny Mickey Thompson 215/60R14 drag radials. He used stock 14×6 steel wheels and full hubcaps, which are bolted into place for safety. The car ran consistently in the 6.80s with the whitewalls. Shannon has also worked hard to get the car to perform well on regular street radials. He’s tested numerous times with the car and has learned the proper launch technique and the right moment to lay the nitrous to it. His best effort on hard street radials (275/60R15 Futura) has been a 7.10 at 102 mph.
While the cylinder heads are the stock LT1 aluminum castings, with the original 1.94-inch intake valves and 1.50-inch exhaust valves, Shannon had Steve Chapman perform some additional massaging. This allows the heads to flow 262 cfm at 0.600 inch of lift. Shannon then installed a Comp Cams 292XFI hydraulic roller camshaft and a set of Comp 1.6 roller rockers. The original intake manifold proves to be a limited factor in most LT1 applications, but Shannon seems to have great success with it after installing a 58mm throttle body and a set of 36-pound injectors. The secret to the combination resides in a blue bottle that hides in the trunk—Shannon sprays the Chevelle with a 175hp dry shot of nitrous. That’s generally way too much nitrous for a dry shot, but Shannon tunes the car to provide an adequate amount of fuel when the nitrous is activated.
For aesthetics, Shannon gave his Chevelle the least-desired color for most muscle cars: green. He also retained the all-steel body panels, original windows, bumpers, and trim. His friend, Michael Hudgins, did the bodywork on the panels and then laid down a few coats of the original “Grandma Green,” and followed that with clearcoat. The car has a great, factory look.
Vehicle: ’72 Chevrolet Chevelle
Type: LT1 small-block Chevy
Displacement: 383 ci
Compression Ratio: 11.3:1
Bore: 4.030 inches
Stroke: 3.75 inches
CYlinder Heads: Original LT1 castings, ported by Steve Chapman
Rotating Assembly: Scat crankshaft, Scat rods, Speed Pro pistons
Valvetrain: Comp 1.6 roller rockers
Camshaft: Comp Cams 292XFI hydraulic roller
Induction: Port-matched LT1 intake, 175hp dry nitrous system
Ignition: MSD 6AL
Exhaust: Summit Racing 1⅝-inch headers, Flowmaster mufflers
Transmission: TCI TH350 automatic transmission, manual valvebody, PTC 3,600 converter
Rear Axle: GM 12-bolt, Lincoln Locker, 3.55:1 gears
Front Suspension: Stock
Rear Suspension: Jegs control arms, adjustable shocks
Brakes: Stock drum brakes
Wheels: 14×7 steel wheels and hubcaps
Tires: 215/70R14 front, 215/60R14 drag radials
Upholstery: Stock
Material: Green vinyl
Seats: Bench
Steering: Original
Shifter: B&M Ratchet
Dash: Original
Instrumentation: Original
Audio: Original AM radio
HVAC: N/A
Bodywork: Michael Hudgins
Paint By: Michael Hudgins
Paint: “Grandma Green” base/clear
Hood: Original
Grille: Original
Bumpers: Original