L92 "821" head on LQ4.

[SicMonte]

I have the oppertunity to buy 821 casting number heads brand new for very cheap...around $350 each. These heads will come with no valves and springs though. Are they worth it?

Are these heads the same ones as on a LS3? Since they are bare couldn't I just get the sodium filled valves and good springs and end up with a "LS3" head?


Another question....would a cam from a gen4 motor work in a gen3 motor?

My plan is to rebuild my LQ4 that I have now with the stock crank, rods and throw in a set of forged flat top pistons. I have a Comp cam that was meant for my buddy's L92 but didnt use. I wanted to put on the 821 heads and a stock L92 intake. What do you all think it will put out power wise? I know it depends on the cam but we sent it back to Comp to have it spec'd out.

Thanks for any info.