C3 Corvette Rust and Corrosion

The body panels on a C3 are fiberglass, so the shiny part you see never rusts. The trouble is the steel underneath, and on a car that is now forty to fifty years old that steel has usually seen some weather. Knowing where a C3 hides its rust is the difference between a good buy and a very expensive project.

The one that matters most is the birdcage, the welded steel frame that wraps the windshield, the door hinges and the roof. It rots from the inside where you cannot see it, at the base of the A-pillars and under the windshield corners. Fixing a birdcage means peeling the body back, so it is the first thing to check and the last thing you want to find.

Underneath, look at the frame where it kicks up over the rear axle and at the front frame horns, and the spots where the body mounts bolt down. Then the floors and footwells, the rear trailing arms, and the brackets behind the bumpers. Put the car on a lift, grab a flashlight and poke around before you hand over any money. The photos below show what all of this looks like once the rot sets in.