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OP said nothing about the engine needing to be NA, he just asked if it was possible.

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oh excuuuuse me then for being so dumb. I was just answering a question.

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??? buddy has a 392ci W5 headed SB w/ a turbo that makes about 1000. Ran his chassis TC3 on a test run (easing into it and feathering it) to a 9.19 @174. Has run 8.60's w/ only 9lbs of boost. don't know if he's made a full pass yet.

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Whats the max cfm outa a set of W5s & the largest CSA? judging from the large port M1 someone was thinking big.

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So is 345 cfm it

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I think leaving a 14mm spark plug out is worth 12 cfm.

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So Vic....What else have you learned in the secret W5 project

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I've learned this..........(or decided)

When I'm done using OEM heads on my engines, I'll step past the W-5 heads.

I've sold nearly everything W-5 related. (except a nice pair of TTI A-body polished, ceramic headers.)

No secret W-5 R&D here. That picture was a MCH CNC W-5.

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That's what I was afraid of I thought you would squeeze some more outa 5s once you started playing around, but I see your point

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Not even anywhere near close.

My old " typical build" 422 W5 motor went 9.85 at 3400 pounds. That was on leafs and a very crude low buck suspension, so no help Et wise with anything exotic suspension wise. Take 700 pounds off that and ypou are what..9 teens??????

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I will call BS on that one.
We don't race dynoes or hypothetical situations. In a perfect world you "might" have run those #'s but I HIGHLY doubt it. There is a lot more to tuning a combo then just subtracting weight. For example, my overachieving 555ci runs high 5.2x at 2850#. It only ran .13-.15 faster at 2400#. So your theory is bogus there. 100# = .1 does not always work. It just takes more effort in a sub 10sec car.
Your combo ran good for what it was, but like you said just a "typical build"

As you know I have a dyno sheet from a w5 built from 15 years ago that shows 741hp. I have no reason to believe it was not accurate. That motor went .99x 60' in a 23 Tbucket before I bought it. It was hurt multiple times and had cam swap. It ran a best of 9.08 @ 149 @ 2650# with a burned up pg and questionable convertor.
IIRC that showed 699hp on Wallace calculator which is only atool as it can not take into account all of the variables. No way to measure but I would guess at least 20-25% parasitic loss. Do the math...

All that said, I do believe the right builder could come close to 800hp in a max effort W5 build.

but who would want to??

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I think leaving a 14mm spark plug out is worth 12 cfm.

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This may be fuzzy memories on my part, but didn't Ritter-Webber run W5's 20yrs ago in Comp.

Seems like back then their Daytona ran 7.70's or so?

Dont know HP required to do that, but it had to be making some steam......

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I've learned this..........(or decided)

When I'm done using OEM heads on my engines, I'll step past the W-5 heads.

I've sold nearly everything W-5 related. (except a nice pair of TTI A-body polished, ceramic headers.)

No secret W-5 R&D here. That picture was a MCH CNC W-5.

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so there will be a real crazy W7 or better headed stock stroke 340 out there in the future?

back on topic: im not an expert but 800sounds like a stretch with W5s could be possible,but doubt it will ever be dupplicated.