The side pipes for the L88...
The side pipes for the L88 cars came in the interior of the car for later installation by the owner. They were unique because they were flat on the bottom for better ground clearance.
L88 Options
C48: Deletion Option for Heater and RadioA '67-model-year option incorporated to discourage street use and reduce overall vehicle weight by removing the heater and defroster. A radio could not be ordered with the L88 option.
J50/J56: Heavy-Duty Power-Brake Combination
A special proportioning valve that increased braking effect to the front to compensate for weight transfer under heavy braking. Brake shoes were stronger than stock units for improved retention. Famous dual-pin front brake calipers were used.
K66: Transistor Ignition
This was the standard transistorized ignition that was used on the L71- and L89-equipped Corvettes from '67 to '69.
F41: Special Suspension
Installed heavy-duty front coil springs and heavy-duty shocks both front and rear, and a heavy-duty seven-leaf rear spring.
M22: Close-Ratio Four-Speed Manual Transmission
Heavy-duty manual transmission with fine-spline input shaft, a large-diameter output shaft, and gear teeth that utilized reduced helix angles. Much noisier transmission than standard Muncie.
G81: Posi-traction Rear Axle
Standard production Corvette Posi-traction system
L88 Engine Tech Pointers:
* The '67 and '68 L88 engines used closed-chamber aluminum heads with a 12.5:1 compression ratio. A required sticker was placed in the interior of the car: "WARNING: Vehicle must operate on fuel having a minimum of 103 research octane and 95 motor octane or engine damage may result." According to Bill Tower, this sticker was supposed to be placed in the glovebox next to the tire-pressure sticker. Most are located behind the stick shifter on the console.
* The '67 L88 Corvettes came without emissions equipment. The '67 L88 Corvettes were equipped with a black road-draft tube mounted on the driver side of the engine. It was used to draft partially filtered gases out of the engine.
* The '67 L88 engines were more unique than later models because the valve covers, aluminum heads, and block were painted Chevy Orange. The '68 and '69 L88 aluminum heads were left bare and the valve covers were chrome.
 While the other '67 big-blocks...  While the other '67 big-blocks were equipped with brass radiators, the L88 sports an aluminum cross-flow radiator with a Harrison Expansion tank. The '67 L88 Corvettes did not have a fan shroud. |  Designed by Holley's Marty...  Designed by Holley's Marty Sullivan who used aircraft pressure strobes to show airflow into the carburetor, this cowl-inducted hood was critical to making power with the L88 engine. |  Plug wires for the L88 were...  Plug wires for the L88 were heavy-duty as noted by the red wire coloration, which matched the color of the unique distributor cap. |