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Originally Posted by hevymetl
I forgot to add it already has HEI. Rather, Im assuming it has HEI since it has newer distributor and no points or condenser. I can live with it. Its not ridiculous loud like shots going off, just a rumble or popping with the back pressure like was mentioned. I dont think its worn valves since the motor has recently been rebuilt. I really just need to fix this exhaust leak. Its right at the first joint after the manifold. Its a 2 bolt clamp, which Im assuming has a ball and socket type connection. Im hoping I can find something that I can do a bolt on replacment fix with rather than taking it all down to weld. Does anyone know if I can just order the whole shebang? Its pretty rusted so a total replcement wouldnt be out of line. Thanks for all the replies on this, Im lovin cruisin this truck around. I went to the lumber yard the other day to pick up railings for my deck, and like 3 different dudes commented on my "work" truck.
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I believe exhaust leaks can also cause back firing as it allows cold air in.