Whats the difference ? 4150 question !

The question is, what's the difference between the 850 & 1000 if their physically the same

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What you’re asking is...... where is the “extra 150 cfm” coming from?
The answer to that is....... the marketing dept.

From several years ago.......
The Mighty Demon 850 vs the Race Demon 1000.
Same sized everything........ but the Race Demon has more circuit tunability.........and costs a lot more...... so it’s a “1000” instead of an 850.
And if you got the same sized Race Demon RS......it was a “1025”........ even though it didn’t actually flow anymore.

It’s just more marketing genius.

Personally....... I don’t really care for the “830” configuration(1.56v x 1.687 bore).
I believe the “street HP 850” might also use that venturi/bore combo.