Trout

I pulled these heads off a ls4 5.3. I had a couple of ?'s 1 I read that these are the same as the heads on an ls6, is that correct? 2 can anyone tell me if these are the correct heads or any information. Under the valve covers are numbers two sets of four after the GM stamp first set 1256 second set 1706. On the corner there is a number outside the valve cover 706. Thank you.

garygnu

you want 243 or 799 castings.

Trout

Not sure what that means. I'm fairly new at this and learning as I go.

JUSTINSWS6

What is the 3 nummbers on the upper side of the heads?

Trout

There is the number 706 on the top of the heads.

JUSTINSWS6

706 are 99 to 04 gm 4.8-5.3 motor. 243 heads are what a ls6 has.

Trout

Thank you.

Is there a place I can find this information? I also need help identifying a block.

JUSTINSWS6

Yes the magical google search.....

txh0tb0i972

iTrader: (63)

http://lmgtfy.com/?q=706+head+casting+specs