Later OEM are steel slipperplate as well. IIRC
>>>*No offense intended, but the term "Slipperplate" is a trademark of my company, EPN.
That name was founded some 12-13 years ago when I met with some techs trying to solve the Honda head gasket problem. The 3VZE is wonderfully durable compared to those things in the old days, we had gaskets failing in 2-4 DAYS, dang near ALL of them!
*I hate Hondas to this day, cost me a fortune. I went out and bought a variable speed mill, ($18,900.00) it will make 3600 cuts per minute at 1/2" per minute, so we can machine aluminum to finer texture than glass although 10-12 Ra is a nice finish we shoot for.
We determined that a lot of the very early failures were simply from machine shops not being up to speed with the microinch finish patterns required to allow aluminum to slip across the gasket surface as it expanded.
The effect was similar to someone rolling damp paper between their fingers, even Graphite, then Kevlar and some silicon fillers all failed. Asbestos did work very well but government restrictions ended that material as a filler for the gasket material.
EPA inspectors get real snotty if they find asbestos in any of our shop dust.
The lamination designs suffered the same concerns, witness the Neon, and then the 3VZE. So I popped up with "We need a steel plate of some kind to let the head surface slip."
(*EB being a gene-yus and all...*LOL**) My friend Steve said, "Yea, a Slipperplate." Most companies are now up to speed, the idea is actually pretty simple, now some companies are even expanding on that with multi-layer steel for more severe type service.
But yes, you are correct, Toyota uses the same....technology. It's a pretty good innovation, I am kinda proud of that one since I had a hand in it...*EB