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It could be the carb is it a holley? one good backfire will take out the power valve. but why did it back fire? in your earlier post you said you set your ignition timing at 6 degrees btdc is it still there?
it is still there and i dont know why it back fired it did that once before and the result was 6 out of 8 bent rods and its the stock carter 2 brl on it and timing is still fine