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Old 01-26-2014, 11:19 PM   #15

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If you are truthfully stopping at 750, you don't really need 6 bolt heads.
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Old 01-27-2014, 08:00 AM   #16
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I agree, once you pass the 800rwhp mark your in the market for a 6 bolt block.
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Old 01-27-2014, 08:59 AM   #17

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I disagree. Thick deck heads, good gaskets and studs and 1000 is no issues. I'm the only local I know making 1000+ on a 6 bolt setup. The other 3 locals making 1000+ are all 4 bolt setups. The issue is more in the stock ls3 heads flex/warp but goto a lsa head or aftermarket head and 1000 is no issue, hell 1100-1200 isn't an issue with a good tune.
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Old 01-27-2014, 09:23 AM   #18's Avatar
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Agreed w/ Unreal, we made basically 1200 rwhp on Blake's car and he has a 4 bolt block. It has already been said but I agree w/ it. Thick deck heads, studs, ls9 gaskets, good tune and let her rip. is offline   Reply With Quote
Old 01-27-2014, 12:06 PM   #19
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The need for 6 bolt is when you do heavy racing. 1 mile or so, auto-x, or something when you'll be running high rpms for an extended amount of time. That's when would need 6-bolt.
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Old 01-27-2014, 12:09 PM   #20
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its not really the HP that is the requirement. Its the type of racing you do that is the requirement. Doing any mile events at 1kwhp+, then 6 bolt may be your best interest. But I made 1k+ and was fine with arp studs and LS9 head gaskets on a thicker deck aftermarket casting.

Now I wouldnt go out and make 15+sec WOT pulls and such..
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Old 01-27-2014, 12:22 PM   #21
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6 bolt heads with studs. Make it better.

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Old 01-27-2014, 12:36 PM   #22
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If you are more than 750 whp and do any type of venue other than drag racing, I suggest 6 bolt block and heads.
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Old 01-27-2014, 01:35 PM   #23

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Thanks for the input. Set up for Street Strip. Have TVS EForce on 3.25 and probably drop it to a 3"(if decide to keep it) so I really don't see a 416-18 LS3 going much above 750 anyway. Guess will see what the Heads look like and go from there. Studs at a minimum. Since got to do a complete rebuild don't want to take shortcuts.
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