Question on LS1 heads

[david9376]

I have a pair of LS1 heads that I need to sell. Where would I find the serial number and the year? What would they be worth? Thanks for your help.

[c5z28]

You should ask what year the heads are in the internal section, the price in the for sale section.
Look at the 3 digit # on the top front of your heads and that will tell you the year
#'s to look for
806 97-98
853 99-00
241 01-04

[david9376]

Thanks, sorry I'm new at this.

[c5z28]

Thanks, sorry I'm new at this.

I could see your join date
So what heads do you have?

[wooddaniel]

You should ask what year the heads are in the internal section, the price in the for sale section.
Look at the 3 digit # on the top front of your heads and that will tell you the year
#'s to look for
806 97-98
853 99-00
241 01-04

I think they changed them mid year of 2000 because I had 241's on my car and it's a 2000. To David, I just sold my stock heads for 200$. If yours are 806 casting, you may not be able to get as much because they will only fit on a 98 Car because of the bolt design.

[WS6ICK]

Mine had 241's on a 2000 Trans Am WS6 but I changed them to 243's.

[Too Fast]

My car was made 4/00, it's a 2000 and also has the 241 heads. Must've been a mid year production change. Does anyone know what the difference was between the 241 vs. 853? And th 243's are better than all those others, talking about stock heads.

I also wonder if GM went to the *slightly smaller* cam the '01 and up F-bodies had, when they put the 241 heads on the late '00 models. Maybe not tho, since the LS6 intake wasn't put on until '01-'02, and as we all know it had no EGR provision.

[Tx98Formula]

not to jack the thread or anything but i am getting ready to swap my entire engine harness, the car is a 98 formula. When i bought the car i was told the motor was previsously swapped with a motor out of another 98 trans am, but the casting number on my heads are 853... If the 853's only came on 99-00 ls1's, where can i look on the block to see what year it is from?

If i just bought another 98 engine harness and my motor is not actually a 98 i'm gonna be pissed!! haha...

[00LS12LS6Z28]

Mine had 241's on a 2000 Trans Am WS6 but I changed them to 243's.

+1 only mine is a Z28

[c5z28]

I think they changed them mid year of 2000 because I had 241's on my car and it's a 2000. To David, I just sold my stock heads for 200$. If yours are 806 casting, you may not be able to get as much because they will only fit on a 98 Car because of the bolt design.

Mine had 241's on a 2000 Trans Am WS6 but I changed them to 243's.

My car was made 4/00, it's a 2000 and also has the 241 heads. Must've been a mid year production change. Does anyone know what the difference was between the 241 vs. 853? And th 243's are better than all those others, talking about stock heads.

I also wonder if GM went to the *slightly smaller* cam the '01 and up F-bodies had, when they put the 241 heads on the late '00 models. Maybe not tho, since the LS6 intake wasn't put on until '01-'02, and as we all know it had no EGR provision.

Casting is different guaranteed 20rwhp.


Yes sometime in the middle of 2000 they put on 241's although it is RARE, of course the few exceptions to the rule would post up about it

[david9376]

I could see your join date
So what heads do you have?

I have the 806 heads. I bought them off of ebay about six years ago for a 350 I have. I wanted to improve the engine with high performance heads and other upgrades. A friend of mine said these heads would work, but after I bought them I realized they didnt work. They were put back on a shelf in the garage and forgotten about until a few weeks ago cleaning out the garage. I dont need them but not sure how much to ask for them.

[badseed2000]

My 2000 ws6 build date 5/00 has 241 castings in it too. are those heads good or bad new to the game of LS 1's

[david9376]

Im new as well. Please excuse my ignorance but I know nothing about engine mechanics. I dont know how to tell if they are good or bad. They look to be in great condition and I know they havent been used for six or seven years. They have been stored in a box wrapped in paper and havent been touched since I bought them.

[shady milkman]

Casting is different guaranteed 20rwhp.


Yes sometime in the middle of 2000 they put on 241's although it is RARE, of course the few exceptions to the rule would post up about it

you are telling me if i go to a 241 casting i am going to get a guaranteed 20rwhp from my 806s ??

[wooddaniel]

you are telling me if i go to a 241 casting i am going to get a guaranteed 20rwhp from my 806s ??

I doubt it, my 2000 didnt feel any different with the same mods as my 98. The Hp increase probably comes from the ls6 equipped cars in 01-02

[Firebirdjones]

Where that thinking came from was the different casting process the 241's used over the previous years.
Starting with the 241's, they were cast in 2 different plants with 2 different processes. They used a sand casting at one plant that produced smoother walls and transitions, and these 241's are said to flow a tad better.

They are identified from other 241's by a particular triangular marking near the spark plugs that are made during the casting process. Some have them, and some don't.

So technically speaking, there are 241's floating around that are supposed to be better than other 241's, if you follow that.

[shady milkman]

I doubt it, my 2000 didnt feel any different with the same mods as my 98. The Hp increase probably comes from the ls6 equipped cars in 01-02

that is what i figured i just want c5 to clarify this post

Where that thinking came from was the different casting process the 241's used over the previous years.
Starting with the 241's, they were cast in 2 different plants with 2 different processes. They used a sand casting at one plant that produced smoother walls and transitions, and these 241's are said to flow a tad better.

They are identified from other 241's by a particular triangular marking near the spark plugs that are made during the casting process. Some have them, and some don't.

So technically speaking, there are 241's floating around that are supposed to be better than other 241's, if you follow that.

i believe the sand ones where made in mexico if i am not mistaken ....it is said if you want to keep your 243s stock then look for the triangle

[c5z28]

you are telling me if i go to a 241 casting i am going to get a guaranteed 20rwhp from my 806s ??

If you slap on a sticker it's more like 30rwhp

[shady milkman]

If you slap on a sticker it's more like 30rwhp

oh are you saying the 806s to a 243s ? did i misinterpreted your post

[Firebirdjones]

that is what i figured i just want c5 to clarify this post



i believe the sand ones where made in mexico if i am not mistaken ....it is said if you want to keep your 243s stock then look for the triangle

I think you are correct, they came from a plant in Mexico (of all places) and the triangle markings were found on both the 241's and the 243's.