The main reason I've had them blow out is because the header bolts back out of the head. I was talking to a buddy a few weeks ago about the problem and he said they used high temp rtv instead of a gasket and haven't had any blow outs since...
Chuck
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90 Blazer Silverado 350w/ 700R4 and 32" Kelly's
"I am a bomb technician. If you see me running try to keep up!"
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