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muffler gets white hot and the motor makes apopping noice on 1998 Chevrolet Blazer

i just put a new motor in my 98 blazer and now it is making a popping noice and the muffler and cadalice converter get white hot i changed the wires plugs and cap

Asked by for the 1998 Chevrolet Blazer
Recheck ignition timing and plug wire placement to be sure #1 is where it is supposed to be! Running rough, lack of power?
4 more answers , 1 more comment
Recheck ignition timing and plug wire placement to be sure #1 is where it is supposed to be! Running rough, lack of power?
poss running very lean
Was the new motor a 'long block' , 'short block' or complete used motor from a salvage yard? Popping through intake? Valve or timing(or both) issue.
check to see if your converter is plugged
did and its not