fst100

iTrader: (5)

recently bought a pair of heads, one is 799 and the other 243. the 243 exhaust valves look like they have some sort of coating-tan in color- on the valve face whereas the 799 valves dont look like they have any coating but steel. also one of the exhaust valve face a small area of the 'coating' is gone.

Jimbo1367

If you are running these on the same engine; you might want to ask someone if they have the same combustion chamber volume.

fst100

iTrader: (5)

243=799 so they have the same 64.65cc chamber volume.
edit-they basically ls6 heads

Always2Slow

iTrader: (8)

Pictures would be great, but so far what your describing sounds pretty normal.

fst100

iTrader: (5)

disregard the "5" i was labeling each chamber so i know which valves go to where when i reinstall them.

At the 7 o'clock position




is this cause for concern?

99wssixm6

iTrader: (3)

Remember some of the 243 had sodium filled valves. Look for the 5.7 casting on the bottom of the head in the area the lifters would be under. only 243 from the 5.7 had sodium valves.

z28241

iTrader: (13)

^ ONLY 243 "LS6" (found only on ZO6 vettes) heads that had the sodium filled valves, not thee same 243's found on GTO's, base Vettes etc

A.R. Shale Targa

iTrader: (2)

LS6 valves are roughly 20 grams lighter as well as .0236" of an inch longer

fst100

iTrader: (5)

pics up btw. so is that normal "wear"?

99wssixm6

iTrader: (3)

and to quote myself and z28241 the only 5.7L with 243 were ls6 the other 243 are 6.0l

99wssixm6

iTrader: (3)

ohh I forgot....no that isn't a problem with the color of the valve. If only one was a very different shade of color I would be suspicious but they are all that color you say. And remember factory non modded engines run very lean.

fst100

iTrader: (5)

appreciate the response guys. i asked cause the 799 exhaust valves felt and looked different, much more like the intake valves.