Heads only questions

To summarise, we have one GTO running stock cam and ported 241s and did 417rwhp. He switched to an LS6 with the same ported heads and went 449rwhp.
And these are the only results?

Are there any of these types of results in Vette land Superman09?
Is this car a freak with unrepeatable results?
And maybe whines as well......

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Was wondering if anyone has done this since I have a set of tsp stage 2.5 ls6 and a custom cam but was wanting to to do the heads first just bc I'm curious and don't really have ability for my car to have down time right now due to selling my truck
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You will probably end up buying PRs twice, but they are fairly cheap. Other than that, I really don't see much wrong with doing the heads now and the cam later if that's the way you need to do it.
wondering if you just put the heads on or not??
anyone have results or have found any?



