454 motor problem

#1
I have a 1985 winnebago with 454 chevy motor. We took it on a 300 mile trip. When I started it to come home one of the spark plugs blew out.Could anyone tell me why this happened? :sleepy:
 

C Nash

Senior Member
#2
454 motor problem

Not installed properly, bad threads are a couple things that come to mind. Did the new plug screw all the way in and tighten up?
 
#3
454 motor problem

hotrod nc
Did the spark plug itself (threaded portion) blow out or did just the porcelain section blow out?
 
#6
454 motor problem

i think i would replace and /or tighten the other plugs to prevent having that problem on a trip again. I have a friend that just snugs his plugs and says it's easier to remove them and he has been lucky and haven't blown out or damaged the threads with compression leaking from a loose plug.
 
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