1998 Chevrolet Blazer Q&A

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

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 -
Answer 1
check to see if your converter is plugged -
Comment 1
did and its not -
Answer 2
poss running very lean -
Answer 3
Recheck ignition timing and plug wire placement to be sure #1 is where it is supposed to be! Running rough, lack of power? -
Answer 4
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. -