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Old 12-22-2018, 08:34 AM   #1
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Deposit in exhaust port

Am doing some exhaust work and had to remove the passenger side header, noticed some deposit inside the cylinder head exhaust port and the corresponding header tube, only have deposit in cylinder 8, none in 6 4 and 2. Haven't removed the driver side header, so don't know what the situation is there.

Any ideas what could be causing this?

Cylinder 8 with the deposit





Cylinder 8 header tube:




Cylinder 7, as you can see it looks a lot cleaner:



Cylinder 7 header tube:



Thanks.

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Old 12-22-2018, 09:06 AM   #2
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Christof, how do the spark plugs look?
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Old 12-22-2018, 09:18 AM   #3
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Most likely a bad valve stem seal leaking oil down the valve area.
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Old 12-22-2018, 10:56 AM   #4
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I had major oil loss in one cylinder and it didn’t look exactly like that. Are you still running the propane or different fuel setup? Could it be related the that?
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Old 12-23-2018, 04:54 AM   #5
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Quote:
Originally Posted by Redtruck-VA View Post
Christof, how do the spark plugs look?

Have not checked yet, will do next time i'm in the shop.
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Old 12-23-2018, 04:56 AM   #6
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Quote:
Originally Posted by charged392 View Post
Most likely a bad valve stem seal leaking oil down the valve area.
Any other downside tot that besides the oil loss and the deposit? Don't really feel like changing a valve seal right now :-)

The valve cover was leaking some oil right above this exhaust port, can't imagine that oil making it's way into the exhaust port?
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Old 12-23-2018, 04:57 AM   #7
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Quote:
Originally Posted by YeahItsAHemi View Post
I had major oil loss in one cylinder and it didnít look exactly like that. Are you still running the propane or different fuel setup? Could it be related the that?
Yep still running on LPG 90% of the time, if it was related to this, I should probably see this deposit in all cylinders?
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Old 12-23-2018, 05:51 AM   #8
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No major downside other than damage to the cats and fouled plugs. Isn't LPG hard on valve guides?
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Old 12-27-2018, 06:31 AM   #9
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Quote:
Originally Posted by Redtruck-VA View Post
No major downside other than damage to the cats and fouled plugs. Isn't LPG hard on valve guides?
LPG is indeed hard on valve guides, but apparantly dodges valve guides hold up very well with lpg, also the reason 90% of pickup trucks over here are dodges. So i doubt that the lpg is the reason, these are still the stock heads, all I did when I rebuilt the engine 40.000 miles ago is clean everything up and upgrade the valve springs, might be that everything is just worn out a bit?

I removed the header from the driver side engine and noticed a wet looking dark ring around the circumference of some valves, see picture below, this one was the worst but was visible on other cylinders as well. Any ideas on what's causing this, can't be normal?

Have been thinking of upgrading the heads for some years now, seems like the moment has come?

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Old 12-27-2018, 07:44 AM   #10
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Ported heads certainly will give a big bump in horsepower. What are you thinking? CNC ported 03-05 work good. 6.1 design flow great. I especially like the Edelbrock heads for several reasons.
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HTC 2018 TOTY

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