BlackGMC

iTrader: (31)

Well i got my LQ9 swapped in this weekend, and i was thinking about putting my PRC heads on it later, but when i had the 4.8 on the stand i looked at the exhaust valves, they are white and crusty... All of them look like that and all the spark plugs were white too. Tell me this is not normal...

TX Tahoe Z71

iTrader: (28)

My guess is running lean as hell or fuel additives. Maybe E85? Not sure what color it leaves behind.

AKlowriderZ71

iTrader: (22)

It's not normal. Send them to me for analysis.

silver-mod-o

iTrader: (15)

I've seen stock heads come off stock engines look like that Corey. I know you're on top of your tuning. I say disassemble them, inspect everything, re-lap all the valves and clean them up and put them on the 6L without thinking twice.

krambo

iTrader: (4)

My Radix'd 6.0L looked almost like that when I pulled it. I took some acetone and tried to wipe the valve stems off however the color didn't change. I did not run lean at WOT however did run a 50/50 methanol mix with pump 93 (usually a 10% ethanol blend) and the rare occasion of C16 for the track.

I hope an engine builder chimes in here as I am all ears on this one.

Bigredmariner

iTrader: (6)

Looks pretty much like what I saw on my 5.3, never worried much about it and nothing has melted down yet. Never been lean either and about all I can get is 93 octane with a 10% methanol.

RibeiroBJJ

iTrader: (17)

X2 on my Radix'd SSS looking the same..but I ran a mix of 91/110 vp ...Interested on reason as well....

TXsilverado

iTrader: (19)

lap them and throw em' on. you could have saved yourself alot of grief by doing the head swap on the engine stand.

Bumpers

iTrader: (10)

Yea why didn't you put em on while the engine was out ? Its not anywhere near as fun doin it in the truck

BlackGMC

iTrader: (31)

Cool, ya i never ran it lean intentionally, however i did have a 02 sensor die on me and I ran it for a couple hundred miles... But I would have expected the damage to be only on 1 side not both. I will take them apart in a little while.

Well that is good to hear.

Well i wanted to take them apart and have them checked out prior to putting them on my new motor. The old motor used some oil and it started using oil when i put the heads on...