450 Whp possible with 12.5:1 compression
 

I am putting together all the parts for my engine, but the piston decision is complicated, my goal is 400+whp, my turbo is an EFR6258 and the E85 option does not work for me. I don't have e85 nearby and I don't want to rely on e85. I just wanted to know if it's not crazy or which one do you recommend for this goal.

Maybe?
I've yet to see anyone actually try High Comp boost with those numbers.
Most are too afraid to try and find out, cause it it doesn't work it's wasted money or worse.

I'd say get a stroker kit to help.

to me that s not possible on 93oct and stock compression, even if you install a super huge turbo to keep charge temp down and it would anyway have an extreme lag

you'd want something like 10:1 with normal fuel to reach those hp, and a big turbo

Too much for pump gas imho, you'd need E85, C16, or meth injection to reduce knock.

EFR6258 is going to produce a ton of heat making 400+ whp

Get some meth

On a stock block or one of those HKS jobs?

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it is a stock block, I was thinking that maybe with an increase in displacement it could be possible

I could actually play it safe and go down to 10.5:1 but I really like the efficiency and the lag can't be giant

Now that I think about it, meth can be more easily adapted to what I'm looking for, I'll put it among the options, the problem is that with strong movements it may fail.

Has anyone achieved something similar?

Possible yes, longevity no.

Sounds like about 400hp is the most you want to do on a stock block. (If you want to drive it more than once or twice)

According to https://www.ft86club.com/forums/showthread.php?t=38494

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Possible? Yes.

How deep are your pockets?

You're gonna need race gas if you don't want to do e85.

if he doesn t want to rely to e85 that he could get on the street, it seems to me useless to propose racegas.. and with 93 oct those hp and stock compression are not possible