AceHaag

iTrader: (12)

Are the 243 heads used on 5.3s any different than the ones used on the 5.7s?

ss.slp.ls1

iTrader: (36)

You mean the L33? No, head casting numbers are unique, a 243 head is a 243 head. The only difference their would possibly be is whether or not it has the lighter sodium filled intake vales or not. But for most people, it doesn't matter at all.

AceHaag

iTrader: (12)

Thanks I got a 5.3 out a trail blazer and it has the 243 heads so i was going to use them on my 6.0. I may be getting another set also so i just wanted to make sure they are the same.

synisterC5

Someone must have changed heads on the 5.3. I dont believe they ever came on a 5.3.

garygnu

I was just told they did come on some 5.3 engines.

bww3588

iTrader: (49)

the 799's came on the L33, its the same as a 243, just doesnt have the sodium filled valves and i beleive it has a smaller chamber like all the other 5.3 heads.

AceHaag

iTrader: (12)

so are the 799's better because i have a set of those too.

bww3588

iTrader: (49)

799's and 243's are the same, but the 243's have the sodium filled exhaust valves.

SweetS10V8

iTrader: (4)

243s came on 5.3L engines, just with heavy valves.

799s and 243s are also the same.