Wrong plug installed, now what?
Thread Starter
Race Director
Joined: Feb 2003
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From: Kingman AZ
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St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Wrong plug installed, now what?
Over the winter I bought new Bosch +4 spark plugs. I was at Pep Boys and bought what the counter guy gave me. I installed them and they seem to work fine.
I was reading my tech manual recently and it says that my 87 takes plugs with NO COMPRESSION WASHERS! The plugs I bought and installed do have compression washers. I had taken the old plugs out a long time ago and don't remember if they had compression washers or not. Over the winter I did a valve seal job, installed roller tip rockers, repainted the valve covers and installed new plug wires.
It runs fine! What effect will these plugs have? They are a real PITA to change. Should I leave well enough alone or change them?
I was reading my tech manual recently and it says that my 87 takes plugs with NO COMPRESSION WASHERS! The plugs I bought and installed do have compression washers. I had taken the old plugs out a long time ago and don't remember if they had compression washers or not. Over the winter I did a valve seal job, installed roller tip rockers, repainted the valve covers and installed new plug wires.
It runs fine! What effect will these plugs have? They are a real PITA to change. Should I leave well enough alone or change them?
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Keep those plugs; you have Al heads (if stock) and there are some errors in the GM Shop Manual.
In this case you need to go by the GM P/N for your year, not by the description in your shop manual.
In this case you need to go by the GM P/N for your year, not by the description in your shop manual.
Thread Starter
Race Director
Joined: Feb 2003
Posts: 16,475
Likes: 270
From: Kingman AZ
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Cruise-In VIII
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
Originally Posted by jd_v3tt3
Do you have iron heads or aluminum?
Pro
Joined: May 2005
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From: crofton maryland
i just took those same plugs oout only because i had no idea how long they were in. i put AC delco's back in with the comp washer? i have a 86, but i need to get a magnet to see if i have iron or al heads?
