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Also, the thing pulls like a freight train now doesn't it? 4000-6500 is insane now, right?
Yea. It is really amazing. I don't have that many mods-- LG Street headers, Black Wing Intake, the 5.3 heads and 224R 114LSA cam. While doing the head swap I changed the oil pump to the Melling High pressure pump, put in new LS7 lifters and lifter baskets, new timing chain and of course push rods.
It has a lot more torque accross all RPM's but is incredible above 4000 RPM. Was a lot of fun doing the swap myself, especially now that I have the knock issue figured out.