Bad28

Just like the title says what are the differences I know that they are basically the same head but what is the difference

wildcamaro

iTrader: (15)

Nothing different between an ls2 243 and an L33 799, same valve size, same port size, same combustion chamber size..the only 243 that's different is the z06 243 which has lightweight hollow intake/sodium exhaust valves

Exidous

iTrader: (11)

I think the 243's from a Zo6 had the hollow/sodium valves but the heads themselves are the exact same.

Either one is a great choice over the 241's, 806 or 853's.

wildcamaro

iTrader: (15)

Right the z06 243 still has same port,valve size, and combustion chamber

1bdbrd

iTrader: (12)

I don't think 243 heads automatically have the sodium valves though. I have seen a stock L33 in a 2012 Silverado with 243 heads and I believe the LS2 GTOs got 243s with solid valves as well.

Exidous

iTrader: (11)

I believe you are correct. That's why I mentioned the Zo6. /wink

Gunslinger09

I thought the 799 had a larger combustion chamber?

thunderstruck507

iTrader: (18)

That is the 317.

243 and 799 are same minus casting finish. Similar to comparing the older ls1 heads to the 241s which are smoother.

The 243 can be slightly smoother than 799s.

Gunslinger09

Okay.

badazz81z28

iTrader: (6)

The casting process for the 243s/241s is different than the 799s. In stock form, the 799s are a rougher cast (sand casted), flow less, and make less hp. In CNC ported form, they are the same.

Only the Z06 and the CSTV got the light weight sodium valves.

wildcamaro

iTrader: (15)

799 heads are late model casting that used the same SPM (semi permanent mold) method, at least my 2005 L33 799 castings were, they have the same triangle casting marks as the 2004 LS2 head castings I got...I had to clean up the slag in the 243s vs the 799s I didn't have to touch, but I guess that's like anything other part that uses a factory manufacturing process, some better than others even with the SPM method compared to the sand cast ones, you will have that

Bad28

Thank you all for your reply I knew most 799s were on trucks while the 243s were on ls1s I have a 2000 and just purchased a set of 799s for super cheap so wanted to make sure there was no difference

ironmanLS1

iTrader: (9)

I'm running a set of stock runner 799 heads. The only work down to them was decked 0.012" and lapped the valves. These were take off heads that needed no real work. So far, along with other modifications like cam, etc, I got 374hp to the wheels with them.

badazz81z28

iTrader: (6)

That's interesting. I haven't seen a set of 799s casted like that. Do you have pictures?

RonSSNova

iTrader: (3)

These are 799 heads. never seen a 243. These are from a 06 L33







Ron

wildcamaro

iTrader: (15)

I don't have any pics handy on my phone, but I was surprised how nice the finish was on the 799 heads, ill post some pics later

Apocolipse

iTrader: (1)

This is all good news to me because my L33 came with the 799. Winning.

I just wish I could get the compression up as 10:1 is not much for n/a now a days.

wildcamaro

iTrader: (15)

Mill the heads up...or down I guess lol

Apocolipse

iTrader: (1)

Haha yes down. I have heard there are thinner head gaskets that we can run as well which would increase quench and decrease the likelihood of detonation... Would that not be better than a full mill?

Roarin_8

iTrader: (5)

243s were on SUVs also, I got mine from a Tahoe. The Trailblazer SS can also have 243s as well.