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6 votes
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Is this cylinder head junk?

This, in and of itself, is nothing to be worried about. The reason I say this is, it is not part of the sealing surface for a cylinder. There is more than enough meat there to seal the cooling port, ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
Accepted

Why is this valvetrain pitch-black?

Classic residue from an engine not worked too hard with low oil change intervals. Stripped and re-built 3 V8's which had that residue (all had done in excess of 100K miles). Took the block and ...
Solar Mike's user avatar
  • 34.6k
4 votes
Accepted

Lapping valves by hand - does the compound have to be cleaned off?

Yes, remove all traces of the lapping compound - it is the metal to metal joint between the mating faces that is being tested.
Solar Mike's user avatar
  • 34.6k
4 votes

Should I be concerned about eccentric valve rotation?

The part you don't show on this exhaust valve which is much more important is how the lapping ring looks on the valve. If the ring which shows the lapping looks even all the way around on both the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
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This valve is pitted - what options do I have?

This valve can absolutely be salvaged. You just need a valve job. You can have a look at what's entailed in a valve job by watching this Jafromobile video. To the uninitiated, I won't go through all ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

Lapping valves by hand - does the compound have to be cleaned off?

Not only should it be cleaned off, you want to ensure you don't get/leave any on the valve stems. You'll wear out the valve guide in short order if you don't. Remember in engine building, cleanliness ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes

Lapping valves by hand - does the compound have to be cleaned off?

Yes it must absolutely cleaned off. The compound is an abrasive paste, as such on initial start up it will be ingested into the engine. The outcome would be the same as leaving some fine sand on the ...
mikes's user avatar
  • 19.9k
2 votes

Is ATF effective for cleaning carbonized heads and pistons?

Yes, ATF is highly effective at cleaning carbon, but Marvel Mystery Oil is even better (it's ATF mixed with dry cleaning fluid). If cold, allow the fluid to sit for at least two days, then spray with ...
Carguy's user avatar
  • 1,967
2 votes
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Do I risk damaging the valve seat if I lap this valve without removing carbon build-up?

Do not try to lap this (or any of your valves which may look like this) without getting them cleaned up first. You must know carbon is a very tough substance (remember what diamonds are made of, right?...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote

Is ATF effective for cleaning carbonized heads and pistons?

Used it a lot back in the early 70's, seemed to be common knowledge in all the Dealerships and was Very effective at removing carbon deposits on the pistons and cyl. Head areas.
James's user avatar
  • 11
1 vote

LS1 - ticking slapping noise w video

I have an LS2 that makes a sound similar to that sound but it was an upper valve tap so i put some Seafoam in the oil before the oil change and now the sound is gone. It also could be the exhaust ...
Conradish006's user avatar
1 vote

What are possible causes for belt tensioner "chatter" at idle?

I drive a genesis coupe for some time now I have been experiencing the same sort of issue- though through forums I have somewhat come across it being normal. I have had my spark plugs replace have ...
Brad's user avatar
  • 11

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