[dscott]

dvcobra, It sounds like the exhaust temps are extreme on your car. Normal exhaust heat shouldn't cause the problem you describe. I don't ever remember a bolt breaking from heat stress. You may want to have someone check the header temp with an infra red gun. We measure our exhaust temps on the dyno and they shouldn't exceed 1500 degress. We tune most engines to run around 1350 to 1400 degrees. Note that this is an internal header temp. Timing will play a big factor in exhaust temps as well as a lean running carb. Other than that I have no suggestions.
Don