I am getting 3 things from all of this.
One: There is a limit around 800hp that is causing a head gasket sealing problem.
Two: Several folks have had the issue but there has not been much talk on the forum
about it.
Three: I need to consider lowering my power goals for longevity/reliability.

I mean if we’re being honest there are several possible reasons we don’t hear much about it. 1st and foremost being the lack of cars in that power range. I would wager someone a good $1000 that there is, absolutely, no more than 20-25 800+whp z34/g37 VQ37 powered cars in the entirety of the world currently. The people who are there most of them likely tight lipped or shop builds(which often times leaves owners out of the loop if they aren’t familiar with engine building/failures). Two(which happened to be my case) no one wants to build this engine 10 times over, failure after failure, scratching your head wondering where the hell youre going wrong; when you’re doing everything the way it should be. Most people driven that far would probably just give up anyway. Another reason being the shops that are aware of this don’t want to share the secret. If you’re always giving away what you know then it becomes increasingly hard to stay one step ahead. Sounds selfish, but it’s business. I happen to have learned the hard way whilst staying dedicated. I would just hate to see someone else wind up on the same path, when for a small fee of $1500(which was about the average cost of each of the 7 or 8 initial times I rebuilt the motor), you can have an insurance that 110% prevents you from this. My high compression 930whp RJM closed deck engine was running like a champ when it let go, and there’s not a doubt in my mind at all that it would still be going strong had I not suffered severe con rod failures that led to a total loss of the engine.

I agree with "Tight-Lip" on above statement,,,been going on for well over 1/2 century in engine builds.

So what are you doing now? Giving up or going to do it one more time at a lower power level?
Thanks for the heads up. I would be aggravated to say the least.

All I have to say is "I am in good hands". I am sticking with the plan. The car makes what it makes.

Remember that rabbit hole the guys kept telling you about? You can find me down there.
Way.
Way.
Down there (if you know what I mean). Until I no longer have the desire to do so... I will ALWAYS push this platform. Further, bigger, badder.

The rabbit hole is full of shiny things and I like shiny things. I tell my self no but they have power over me. Unfortunately I think Rusty is right, I will be done when there is no more money.

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A little birdy told me that the 1/2 mile record is still 156mph set by SOHO Motorsports. I may have to go to Wanno go Fast in Clayton, Ga. and see what I can do when this is done.

I like shinny things.

On the bright side, Z being 10 yrs young, it's a great feeling to see many owners still producing these high quality builds.

You mean, "There are still a few nutjobs doing crazy crap".

I do not see an event in Ga. this year yet. I do see one in Ocala, Fl. which is closer for me.

https://wannagofast.com/?post_type=event&p=845

Only 30 minutes from me. I’ll have to go spectate.

IMHO the reasons the industry is tight lipped is owner pride or allegiance, and perpetually more impossible consumer expectations. The reality versus the perceived reality are 2 very different things. Building your engine and going for 1000+ hp is a lifestyle choice. Lots of exciting marketing and media on the internet is aimed to make it look like its all winning and high fives. All I can say is, saddle up folks.

When I was running my '78 Trans Am. I went through 4 Pontiac 400 motors. I was trying to increase the power level each time, but only to find the next weak point. Not too many people at the time was sharing or willing to share info on how to keep the motor together. So after 4 motors. I switched to big block chevy. Problems solved.