need three pair of heads for GEN IV motors casting number 990

You probably already know GM does not make them. Unless someone has some laying around used your in luck. Other option is to go for merlins.

I have 2 pair. 3 of them are cracked between the valves. Still interrested?

I Have A Pair Of Cast # 14096188 New Valves Perfeft Shape. Not Sure If They Are The Same. Ron Bender 216-390-1330

I also have a pair

posted on another thread GM does not make them but GM performance does or at least did GM and GM Performance are two separate operations

That is correct but the updated casting number is the 188. I bought a pair from Scroggin-Dickey Performance out of Texas. The specs are all the same just the casting number is different.

I have 1 pair oe 188s...cracked the same place..

Thanks everyone i have plenty of cracked ones.

ScarabScoundroul how much for the one that is not cracked maybe this way i can make one pair for someone that needs a set.

i have decided to go with merlin heads. I am afraid that if this many are cracked their is a problem.

birdog are both of them cracked.

[QUOTE=guillermof]I have decided to go with merlin heads. I am afraid that if this many are cracked their is a problem./QUOTE]

Yep, and more than likely the problem is stock Merc risers/manifolds. That's what trashed mine.