interesting looking exhaust valves

[Jacksboys]

When my father was taking apart his engine, we noticed that the exhaust valves for cylinders #5 and #8 did not have any carbon on them, but all of the other valves (including intakes) had a lot of carbon deposited on them.

What could have caused this?

[moper]

Can you post a pic?

[Jacksboys]

sure, here you go.

1st- driver's side head - #5 clean 
2nd- Pass. head - #8 clean 


maybe 10 miles on the motor

[sleepychallenger]

wow. thats cool!

[Harkonnen]

Is it just the light or is the #8 at the passenger side oily ?

[MEK-Dangerfield]

Is it just the light or is the #8 at the passenger side oily ?

I noticed that too.  That would NOT be a good sign. 


  Mike

[Moparal]

Has 10 miles on it and had to take it apart?  Kinda looks like a bad seal on the head gaskets to me, in a couple of areas on both heads.

Hows the plugs and did you do a compression test before tear down?

[sleepychallenger]

Is it just the light or is the #8 at the passenger side oily ?

i didnt even notice till you said. uh oh 

[Jacksboys]

Is it just the light or is the #8 at the passenger side oily ?

I think that he just got it dirty when he was removing the heads.  There were no signs of oil on the plugs.  The interesting part of the plugs was that all of them looked "good to lean" except for the #1 plug which looked real rich.

Has 10 miles on it and had to take it apart?  Kinda looks like a bad seal on the head gaskets to me, in a couple of areas on both heads.

Hows the plugs and did you do a compression test before tear down?

This is the motor that he was having a ticking noise from the valve train that would not stop.  He found out that there was a plug missing at the oil filter and it was not pumping oil very well.  The motor came out and he checked the rear main only to find that it was badly worn. 

I think the picture looks deceiving because I person, the gaskets looked like they had a good seal.
He did not do a compression test.

[Chryco Psycho]

ok so you are running a dual plane intake & 1 side of the carb is running lean causing the exhaust valves to run far too hot

[Jacksboys]

ok so you are running a dual plane intake & 1 side of the carb is running lean causing the exhaust valves to run far too hot

yep a dual plane intake

I never would have thought of the carb...  ...Which side of the carb would need to be changed?

[Chryco Psycho]

well you need to know which side each head was removed from ,the 2 center valves on one head & the 2 outer valve on the other head will be on one plane either upper or lower & once you determine which plane is lean you can tell which side of the carb is running too lean & feeding the plane which is lean 

[Jacksboys]

okay, thanks for the info

[GoodysGotaCuda]

I think that he just got it dirty when he was removing the heads.  There were no signs of oil on the plugs.  The interesting part of the plugs was that all of them looked "good to lean" except for the #1 plug which looked real rich.



This is the motor that he was having a ticking noise from the valve train that would not stop.  He found out that there was a plug missing at the oil filter and it was not pumping oil very well.  The motor came out and he checked the rear main only to find that it was badly worn. 

I would think the oil is from disassembly as well. You fired a new motor without a oil pressure gauge? 

[Jacksboys]

I would think the oil is from disassembly as well. You fired a new motor without a oil pressure gauge? 

It had a pressure gauge at the filter, not at the top of the block. That gauge was reading 60 psi when cold, so the high volume pump had to be moving a bunch of oil.  I suggested to add another gauge at the top of the block and then we found the problem.