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-   -   demon 850 (https://forums.maxperformanceinc.com/forums/showthread.php?t=883593)

performerrpm 12-27-2025 12:00 PM

demon 850
 
i picked up a pretty decent looking and suppisedly good working demon 850 off the fb marketplace. i was actually needing one a carb to use on a couple dif intakes i got. plan is most likely just clean it up and rebuild it but....


its an annular booster style carb now, anyone converted one of these from draw through to blow through? what all would need done? i see theres a company sells an e85 conversion for it but not too much on blow through info.

Skip Fix 12-27-2025 01:39 PM

At one time they had one that had removeable boosters you couple swap in -different size downlegs or annular! As well as interchangable sleeves for different cfm! I had Jeff convert a regular 850 into one of those when the parts were still available from Demon.
I have an 850 down leg Demon on my IA motor.

performerrpm 12-27-2025 02:33 PM

Quote:

Originally Posted by Skip Fix (Post 6597268)
At one time they had one that had removeable boosters you couple swap in -different size downlegs or annular! As well as interchangable sleeves for different cfm! I had Jeff convert a regular 850 into one of those when the parts were still available from Demon.
I have an 850 down leg Demon on my IA motor.

i was reading about those, looks like the kind demons had that option. i also seen you could have the body machined for the sleeves probably like what was done to yours. looms like other than interchangeable holley parts there isnt awhole lot available. if i can change this one to blowthrouvh it may change the direction of my 406 from decent na street strip type motor to something with a bit more power

steve25 12-27-2025 02:50 PM

Getting that set up for blow thru boost besides the swapping out of the boosters I would leave to a carb shop to undertake

performerrpm 12-27-2025 03:34 PM

Quote:

Originally Posted by steve25 (Post 6597279)
Getting that set up for blow thru boost besides the swapping out of the boosters I would leave to a carb shop to undertake

lol..ive been watching youtube vids....and im leaning to what your saying.....there pointing to stuff that even with my glasses on i dont see it.

kinda sux i procrastinated too long the other day, was a 750cfm blow through demon for 400....be tough to duplicate it for the money in converting.

blueghoast 12-28-2025 12:10 AM

Talk to Charlie66, He done his own and can give advise.

GT

performerrpm 12-28-2025 02:27 AM

ill definitley hit him up about it.


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