The lead engineer of the engine at Marauderville (11 maybe?) said the heads are the last thing you need to modify. Won't get much out of them until you have done absolutely everything else to the max. 800 RWHP is close to around !000 at the crank, correct? That's a lot of HP, a lot of boost and a lot of other things to work on before you worry about the heads.
Steven
2004 Marauder Black, loaded
Vortec S/C
4.10s
3500 PI Stall
Kook's headers
476.9 rwhp 385 lbs/tq
KVR's, QA1's, M&Z control arms, rear sway bar
Lidio tune
2004 Suburban Dark Charcoal
1970 W-30 442 convertible twilight Blue