Jz's have a MHG stock so of course will hold far more pressure before failure.
Look at a composite HG as a burst panel, it will fail before mechanical damage occurs (hopefully)
"If" you can keep it detonation free with a perfect tune then 600 is doable but this rarely happens in the real...
They changed materials way back from an asbestos based HG and that's where the Tq setting became screwed as the Non asbestos HG's need more clamp force to stay compressed.
There have been quite a few "revisions" over the years.
I had a MAP sensor there on the 6.0L Chev/T04z combo and saw minimal vaccum under any conditions to the point I saw the Sensor as useless and removed it.
I had a very free flowing filter with a LOT of surface area though so it may be different if a restrictive filter is used.
If the crank touches the bearings while running the Oil system isn't doing it's job, "might" make a difference on a Cold start but most modern Oils are quite sticky so "should" provide a film even if let sit for months at a time, first start is the other time it might be useful but that's what...
The accordian see's minimal vaccum it's more the venturi effect pulls vapor in with a positive pressure push from crankcase blowby, if you're seeing vaccum there it's time to clean or replace the aircleaner..
Up to you Ingy, the way I did mine worked very well I can't really comment on your...
Up to you, personally I think it's a waste of time/effort/money.
I really don't think there is enough room between the cylinders to do it, I've ran o-rings in quite a few other engines the 7m layout just isn't one I'd try it with.
Ask SupraRich what HG he specced for Gary's 1400 hp 7M in...
Not enough room between cylinders to do o-rings correctly on a 7M, Copper is fine for an engine that will see regular teardown's/inspection anything else it's a WOTAM, why reinvent the wheel a correctly prepped head/block and a quality MHG clamped with ARP hardware easily meets your goals.
You don't need 2x PCV's as the accordian never see's vaccum/boost, the valve's job is to allow a path under high manifold vaccum then close off under normal running conditions/boost
Correct it's a 2 port with a T, it's a Hot rod part I modded and filled with SS pot scrubbers and deleted the...
You can potentially make more power on the top end by running more boost on the same octane fuel, low end suffers and quence/squish isn't optimum so fuel mileage will drop.
From memory mine was in the low 8's with an uncut Head/Block combination but any machine work will affect this.
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