X HEADS

If I were building something with 340+ cubes, that was going to be noticeably more power than stock, and I had to use factory iron heads....... and all of the candidate heads were in equal condition....... my preference would be X heads.
But, I wouldn’t pay a big premium for them.

They’re generally worth more to the resto guys than the typical performance enthusiast.

My old 340 had reworked 587 heads on it, and made 475hp with them using a SFT cam.