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Discussion Starter #1
i have an old 800cfm mech. secondariy holley i want to switch the main body with one of them no choke horn ones prolly holley as well my question is this my secondarys dont have idle mixture screws only the primarys do i would like to have 4 corner idle adjustment what do i need to do to make this happen. i also want a more agressive race calibrated primary/ secondariy metering blocks as well
 

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To have a 4 corner idle adjustmant, you'll need the main body to be set up for it, a new throttle plate with 4 corner idle, and a new secondary meetering block. Pretty much all you'll use from your existing carb are the fuel bowls, the primary meetering block, the floats, and some of the screws that hold everything together.
 

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Discussion Starter #3
i was going to use that holley main body ( hp type ) i cant find any secondary metering blocks i looked at proform and quick fuel i was looking at the quickfuel throttle plate. can i still use the holley hp main body if my carb doesnt have 4 corner i hadnt looked at the holley web site either i think it would be a better idea just to get an 800 or 850 holley hp or demon sportsman carb instead im running a 750 speed demon right now just wanted to try a bigger carb to see what my e.t. will be
 

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The secondary neetering block for a 4 corner system should eb the same as any primary block. Any HP main body should be set up for 4 corner idle, but you'll need to double check. Give Holley a call. Personally, instead of going thru all the trouble, I'd just get this:
http://store.summitracing.com/partd...-850&N=700+4294919007+400990+115&autoview=sku
I personally can not in good conscious recommend a Demon carb. My person experience with them is not a good one. I'd either buy the Quick Fule carb, or a new Holley HP, or if you want to save a couple bucks, try this one:
http://store.summitracing.com/partd...7201&N=700+4294919007+400405+115&autoview=sku
 

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I know a guy looking to sell an 850 proform carb. His name is duane. PM me for his number if interested.

Nevermind he sold it. sorry.
 

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Discussion Starter #7
The secondary neetering block for a 4 corner system should eb the same as any primary block. Any HP main body should be set up for 4 corner idle, but you'll need to double check. Give Holley a call. Personally, instead of going thru all the trouble, I'd just get this:
http://store.summitracing.com/partd...-850&N=700+4294919007+400990+115&autoview=sku
I personally can not in good conscious recommend a Demon carb. My person experience with them is not a good one. I'd either buy the Quick Fule carb, or a new Holley HP, or if you want to save a couple bucks, try this one:
http://store.summitracing.com/partd...7201&N=700+4294919007+400405+115&autoview=sku
yeah i was looking at those too im sorta with you about demons ( no vender bashing at all just prefrence ) mine is really touchy and ive never been able to really dial it in i dont know though ive never really tried or dont know what im doing
 
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