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Old 03-20-2017, 08:23 PM   #1
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Default oil on spark plugs

Been battling this issue to no avail, I am constantly getting oil on my spark plugs threads and on number 2 cylinder will foul out the plug to where it wont even fire. I am running a prc 260 ls3 head and I have rtv the rocker bolt holes. I have no idea where the oil is coming from. Didn't have this issue until these heads ? Any advise. The motor does use oil but does not leak, going to do a leak down test this weekend. After an hour driving all the plugs are burning good except one and all have oil on the threads.
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Old 03-20-2017, 08:42 PM   #2
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Valve seals/guides....
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Old 03-20-2017, 08:44 PM   #3
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The heads have less than 5,000 miles but I have noticed this problem since day 1.
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Old 03-20-2017, 08:47 PM   #4
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Make sure the valve seals were correctly installed. Even new they will fail if not done correctly.
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Old 03-20-2017, 08:51 PM   #5
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Would of been straight from tsp, but I will check. Will a leak down test help confirm this ?
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Old 03-20-2017, 08:55 PM   #6
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Probably not if the valves seal well.
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Old 03-21-2017, 08:18 PM   #7
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It would have to be more than just a valve seal to foul a plug.
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Old 03-21-2017, 08:40 PM   #8
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Quote:
Originally Posted by G Atsma View Post
Valve seals/guides....

First item to check, it was the issue on my engine after new valve seals installed, 3 did pop-up
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Old 03-21-2017, 09:27 PM   #9
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Going to check this weekend all plugs have wet threads however only cylinder two will foul out
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