TheNerdyPotato
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Sources say Lexus is doing 600+ hp v8 twin turbo engine for LS F, LC F, this has been in various Japanese mags for past year or more .
The prevailing rumor was it would be a 4.0l V8, but I think that's unlikely. Toyota is historically conservative with their engine power outputs, especially on mass produced engines. Both the 8AR and V35A have a specific output of about 120hp/l. To get 600hp, they'd need to jump to 150hp/l out of 4.0l. While this isn't impossible (Ford GT 640hp/3.5l, for example) I doubt that Toyota/Lexus would push that hard. 5.0l would achieve 600hp at 120hp/l, so that'd be an option.
Giving specific output a small bump to 130hp/l would require a 4.6l, which would be the displacement you'd get from taking the V35A and adding 2 more cylinders. I think this is a totally plausible solution. It would feature some parts and tooling commonality with the lower-end engine while having slightly more aggressive tuning for being the top-end engine option.
^ Posted that above in another thread, forgetting that this thread exists.