Generation III Internal Engine 1997-2006 LS1 | LS6
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View Poll Results: Which option would you choose???
LS6 799/243 castings which flow 256/180 at .550" lift.
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Port my current 853 castings to 280/210 at .550"
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Voters: 9. You may not vote on this poll

I have two choices for heads right now.

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Old 02-10-2010, 02:15 PM
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Question I have two choices for heads right now.

I currently have an 02+ LS6 cam, LS6 springs, and LS6 retainers. I have two options at this point and really want to make the best decision possible for what I have and what it will take to get these items installed. So my options are port my current 853 castings by a reputable porter who says he can get me 280/210 on my stockers for 450$ or get a set of 799/243 heads. The only issue I see with going with the 799/243 heads is the need for a different size pushrod. I will be reusing all the stock parts I can. I will be replacing gaskets with GM original parts. I'm not looking for every last HP I can get out of it. I just figured if I'm swapping this into a 1995... why not make it as close to LS6 power numbers as possible. So! I leave you with this question.
Old 02-10-2010, 02:20 PM
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i would go with the 243's as they will leave you so room to grow and have a much better runner/chamber. if both heads are unmilled you *should* be able to use the same pr's
Old 02-10-2010, 03:01 PM
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Originally Posted by outkast6991
i would go with the 243's as they will leave you so room to grow and have a much better runner/chamber. if both heads are unmilled you *should* be able to use the same pr's
yup, also the 799/243 have better a more efficient chamber that is also smaller to bump compression roughly ~0.5. I would definitely go with the 243/799s. I got 25+ rwhp and no loss swapping on as cast out of the box 40K mile 799 truck heads.
Old 02-11-2010, 11:50 AM
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Which choice do I make between the 799s and 243s?
Old 02-11-2010, 11:56 AM
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whichever is cheaper/readily available
Old 02-11-2010, 12:11 PM
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both 799 and 243 are the same casting




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