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1000+ RWHP With Ls9 Head Gaskets

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Old 04-22-2010, 10:43 PM
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Question 1000+ RWHP With Ls9 Head Gaskets
Who's running them, what heads, and how much power/boost are they holding?

Thanks, J
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Old 05-09-2011, 05:34 PM
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I would like to here some answers on this also...
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Old 05-09-2011, 05:36 PM
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You have a truck Jarrett, no one wants to talk to you
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Old 05-09-2011, 08:11 PM
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Originally Posted by stock48
Who's running them, what heads, and how much power/boost are they holding?

Thanks, J
I ran them 18psi on my 408, 998rwhp pushing through the converter. never pushed water and that was with stock gm l92 heads and ls9 gaskets, i did oring the block, left the the heads flat. stock arp torqued to 90lbs. since i have upgraded to lsx ls3 heads. went with copper this time because the ls9s were taking forver to get.

also i made some passes at 24psi, 18* timing, no issues.
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Old 05-09-2011, 08:17 PM
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Originally Posted by gennex
I ran them 18psi on my 408, 998rwhp pushing through the converter. never pushed water and that was with stock gm l92 heads and ls9 gaskets, i did oring the block, left the the heads flat. stock arp torqued to 90lbs. since i have upgraded to lsx ls3 heads. went with copper this time because the ls9s were taking forver to get.

also i made some passes at 24psi, 18* timing, no issues.
Wow thats what I was wanting to hear! How did you do the oring? How far did it stick out of the block, and where did in contact the gasket in reference to the gasket embrosed Oring?
Thanks J
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Old 05-09-2011, 08:28 PM
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Originally Posted by stock48
Wow thats what I was wanting to hear! How did you do the oring? How far did it stick out of the block, and where did in contact the gasket in reference to the gasket embrosed Oring?
Thanks J
they were stainless orings, they might be out .030", they dont go through the copper just hold it in place. the copper gaskets are 0.041" i believe. they are right outside the of the embrosed oring.
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Old 05-09-2011, 08:45 PM
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This is what I have been waiting on
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Old 05-09-2011, 11:11 PM
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Originally Posted by gennex
they were stainless orings, they might be out .030", they dont go through the copper just hold it in place. the copper gaskets are 0.041" i believe. they are right outside the of the embrosed oring.
Very helpful info. Thanks
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Old 05-10-2011, 01:27 AM
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no issues here with them..
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Old 05-10-2011, 09:39 AM
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on my 408 they held 19-20psi no problem (made 937rwhp) , the block cracked (6.0 iron) before it even tried to lift the heads, but it cracked the block due to detonation. ls9 gaskets are the way to go.
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Old 05-10-2011, 09:50 AM
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Aren't there a couple ZR1s making 1000+whp now? I think LMR is the shop that built them. I'm not sure of the specs but I think I remembered seeing it somewhere.
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Old 05-10-2011, 11:41 AM
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Check out AutomagicLS1's build. Made alot of hits (25-30) on 26lbs/16deg of timing on E85 at mid 900rwhp, and made a few hits at 30-32lbs and 22deg and have no signs of pushing water. Iron AES 408/AFR 225s, and previously a alum rod/piston 5.7 with the same afr 225s
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Old 05-11-2011, 12:58 AM
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anybody have a part number for this gaskets? will this work on a 402 and 408 stroker?>
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Old 05-11-2011, 02:11 AM
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Old 05-11-2011, 06:43 AM
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summit has them but they take a little while to get. they also price match.
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Old 05-11-2011, 07:40 AM
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What is the bore diameter on the ls9 gaskets? Will they work on a 4.130"?
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Old 05-11-2011, 09:04 AM
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I just ordered the ls9 HG from the dealer I work for and had them the next day for 38 bucks each. using them on my stock 346 and running great so far
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Old 05-11-2011, 09:08 AM
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I have a few brand new LS9/ZR1 head gasket sets, PM me if anyone needs a set..
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Old 05-11-2011, 09:39 AM
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I think bore size is 4.100
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Old 05-11-2011, 09:47 AM
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That would work on a 370ci 4.030 bore, right?
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