243 LS heads - fully assembled

[Frenchy]

6.0, 5.3, 5.7 have diff combustion chamber sizes. If u put 6.0 heads on a 5.3 u will loose compression

Not if they're all the same casting number. 799/243's are the same no matter what engine they come off of. 5.3, 5.7, 6.0 have all used 243/799 heads at some point, and they're all the same.

[qwk_snd]

Are you sure. Surely a larger cumbustion chamber wouldn't drop compression..... Bump for a good seller and thread crappers

Not if they're all the same casting number. 799/243's are the same no matter what engine they come off of. 5.3, 5.7, 6.0 have all used 243/799 heads at some point, and they're all the same.

Thanks guys...

[bangbangskeetskeet]

Not if they're all the same casting number. 799/243's are the same no matter what engine they come off of. 5.3, 5.7, 6.0 have all used 243/799 heads at some point, and they're all the same.

Like I said above the only difference would be if they came off a true LS2 from the car....then they would have the sodium filled valves. But other than that they are the exact same heads that come on the 4.8,5.3,and the 6.0 in all GM's cars and trucks.

[George C]

The LS6 heads are the ones that had sodium longer valves
The LS2 heads had the same springs as the LS6 heads did but normal valves
5.3 HO motors had 243 or 799
53 trailblazers had 243
GenIV 4.8 and 5.3s have 243/799

all these heads have same chambers

difference was the pistons over the yrs for different models