Hi I have a 99 m6 camro . Stok botom with stike 241 heads .Modes r ls6 intake ms4 cam with all supporting 80 mm TB full exhaust 42ib injectors car made 400 whp via efi live on dyno dynamics. Planing on upgreaded heads drivebility is not an issue to meall I want is more power . And planing to shoot
200 nitrouse with c16 fuel and stand alone system and progressive controler . Plz guid me in good heads that could work best for this set up.

It all depends on how much you want to spend on those heads, I run PRC 5.3 heads with 11.5:1 compression, and cam similar to the Ms4 and it runs very strong

Trick Flow 215s, with nitrous, consider forging. But my experience is null in the N20 field. Just my opinion.

HCI2000SS u mean u only run them hrads with a stoke cam to reach that compression . Cause my self I was looking at the same heads as a first option . But so far I have notesed a bit of shortfall from texsas speed answeing my emails . When at the beginning they where excellent on helping me out with set up every thing was bought from them fuel pump and injectores and cam and all supprting including timingchain and oil pump . I was realy pleased with the help I got from them . Keep in mmind I reach that power with where I come from we have the shitiest 93 octain fuel in the planet . But thanx again to my tuner car drives dd with such a big cam . Wich got me excited for the 200 shot with upgreading the heads

No the car came with those heads when I bought it. I was just simply stating that they are a good bang for the buck head, and raise the compression quite a bit. If you have the money, by all means look at more high dollar type heads

PRC 227s... they flow very well on the 3.9" bore and don't stall out at .650" lift. Price is good and they include the right springs for the LSK lobes.

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As mentioned above the PRC 227s would be a great choice for your combination. Feel free to give us a call if you have any other questions or concerns.