I'll ask the folks at Holley custom shop as well, but should I mill the choke horsn off my 3X2 carbs. I wont run a choke anyhow. Thought I read somewhere where the choke horn actually helps direct flow?

Anybody have any real world experience?

I assume its better since all of Holley HP/racing carbs are smoothed out.

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Gene Chaas
Gold Member 62/ACES
67 SS 427 (http://www.chevelles.com/feature/october2000.html)

Yea Gene, it does help more air flow 'faster' into the carb. Less obstacles = faster flow. I milled a 4150 750 double pumper I used to use on the 383 and the noticeable difference was crisper throttle response on the bottom-end. Didn't notice any difference on the top-end...ie. she didn't pull any harder.

Never tried a substack (do they even make em' for your set-up?) but you may want to if you wind up whacking the choke horns. Supposed to smooth out the air flow even further. Let us know what Holleys' take is.

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502 Rat Infested 1970 Malibu - Gold Member #39
Keep America Beautiful - Drive A Brute Force Chevelle!
http://pages.about.com/wescolby/personal.html

Wes, thats what my carb man wants to do. Once we measure the installed height of tripower, we're going to have K&N make a custom tri air filter as tall as we can. Should allow use of the stacks.

My man at Holley custom shop said he ASSUMED I wanted them cut off. OK.

Guess I'll have that tripower ready to run down to TN!

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Gene Chaas
Gold Member 62/ACES
67 SS 427 (http://www.chevelles.com/feature/october2000.html)

[This message has been edited by 427L88 (edited 01-09-2001).]

you're milling all 3 airhorns off,correct?(that would look WILD,besides being functional) .Sounds good to me.I milled mine off my 780 Holley 'bout 8 years ago(see below http://www.chevelles.com/forum/biggrin.gif),and like Wes said,you noticed some better throttle response down low,without bothering the top end.I say go for it Gene.

milled airhorn shot (http://chevelles.com/showroom/mr4speedjpgall)

Would a milled horn be similiar to the 8 tube stacks you see popping out of old school Hot rods? you know the ones that have a straight tube that is flanged out at the top (one for each barrel). The flange and some kind of Bernoile's (sp) porinciple will cause an area of less pressure and the air will force itself down the tube at a greater rate than gravity as you gain spped in the car.

-What can I say, my dynamics teacher drove a 69/396 with a M22 and 4.11s http://www.chevelles.com/forum/cool.gif

Gene, try this--> Mill only one (or maybe even two) of the carbs. then you can swap them around and see how each affects the "off idle" and/or the "top end" They should each be the same cfm right? and same jetting? Also, how rich are you bro? I mean, paying some one to mill off the horns from your 3 duece setup.... I'd be lucky just to own that setu, much less chop it up http://www.chevelles.com/forum/biggrin.gif http://www.chevelles.com/forum/wink.gif

I always thought the horn helped direct airflow down into the carb. Straightens out the flow, better velocity. That's what the sub(stub)stack(sp?) does, yes? It sounds like a good idea but milling the horns kinda goes against everything I've heard, but then again I haven't heard a whole lot anyways. http://www.chevelles.com/forum/biggrin.gif

I'd almost bet the Holley guys say don't do it. Curious as to what they will say. But if Wes and Mr 4 Speed say it works ok then go for it. Learn something just about everyday on this site. http://www.chevelles.com/forum/smile.gif

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-Mark TC# 717
ACES #1641
1967 Chevelle SS396/375 (http://www.chevelles.com/showroom/1BadRat2)(20 year old Polaroid pics. Sorry)
1964 Chevelle 283/195
1975 Corvette 396/375 (http://www.chevelles.com/showroom/1BadRat1.jpg) Looks are very deceiving!

I am using a K&n stub stack on my 4 bl the car has a stumle w/o very crisp with it...FRED

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Fred, thnx. Mark, you agree with another old Holley rep who offerred his opinion.

But like I said Holley assumed i wanted them off as they cut the D shaped air cleaner boss.

Hey, I really gotta thank our "man inside" at Holley ,Doug Flynn. I would never have thought of calling the Holley custom shop.So far, the price is right and I'll get three custom machined and replated carbs. Bet they look mint. And RIP TOO!

Thnx for the suggestion Doug! http://www.chevelles.com/forum/wink.gif

the fella helping me set the thing up ( which is actually dead simple if you look at the three carbs as the primary and secondary of a 750, with two secondaries ) even had me ask about annular boosters. And yup for 38 a side and 35 to machine I could;ve got annular boosters put in. But, the Holley man agreed too, better yes, but we're talking .10 maybe. Annulars should give cripser response throught better atomization/distribution. But heck, that is exactly the attribute of the tripower v single 4.

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Gene Chaas
Gold Member 62/ACES
67 SS 427 (http://www.chevelles.com/feature/october2000.html)

[This message has been edited by 427L88 (edited 01-09-2001).]

http://www.holley.com/HiOctn/ProdLine/Products/FMS/Carb_pics/f0-80585.jpg


here ya go ! just buy 3 of these spilt dominators from Holley.

[This message has been edited by roger69 (edited 01-10-2001).]

Whoa! Only trouble is spacing between center and rear carb is tight so center hung float bowl is a no-go.

Heck with 3 4412 estimate cfm to be 1125. About 400 more than i need!