Coupes benefit greatly from the addition of underbody bracing.
C4 corvette frame stiffener.
It s a frame stiffener bar system that puts the framerails in compression not allowing the framerails to flex under load.
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As a result all c4 convertibles were equipped with an underbody x brace.
86 96 c4 no flex frame stiffener bar system.
The x frame is used to stiffen the frame and body.
Take the top off before installing the c4 no flex frame stiffener bar system and measure the distance from the windshield header to the halo with the car sitting on the ground now jack the car up on either side and retake the measurement.
With the c4 no flex frame stiffener bar system installed you should be able to open either door or hood with the car jacked up.
Underbody bracing was found to be a simple solution to the frame instability issue.
84 corvette fuel sending unit without pump.
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85 87 corvette fuel sending unit without pump.
The good news for 1986 96 c4 owners is there s a direct bolt in aftermarket solution designed by gordon killebrew.