Posted By: dartman366
smallblock modman intake.. - 05/05/12 06:10 AM
..has anyone tried one yet and if you have did you see any improvement with it?. 
smallblock modman intake..
Posted By: moparclown
Re: smallblock modman intake.. - 05/05/12 07:12 AM
When the body guy gets the car done,someday I am hoping 
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 09:38 AM
Ive been running one for what a year and a half now, its been a learning exp. for sure.
Its leaps and bounds over the modified/gutted oem six pack intake I used to run.
Here is my take on it, first its one rough azz intake from the box, cast with very rough 318 sized ports which is not that bad since we all do our own thng with the ports.
Its leaps and bounds over the modified/gutted oem six pack intake I used to run.
Here is my take on it, first its one rough azz intake from the box, cast with very rough 318 sized ports which is not that bad since we all do our own thng with the ports.
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 09:42 AM
The top plates are very nice with there anti reversion feature....
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 09:52 AM
Since there is no heat to the manifold and I never run a choke I added a small self reseting burb plate which on a few very cold startups worked very well.
![Attached picture 7193153-DSC03659[1].JPG](https://board.moparts.org/ubbthreads/upload2/7193153-DSC03659[1].JPG "7193153-DSC03659[1].JPG")
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 10:42 AM
Now to present day...with no spacers it felt a bit lazy until the higher rpm areas.
So I went with a 1 inch spacer and with the 1/2 inch plate kit lower rpm throttle response improved and the powerband changed.
Through reading, research, actual testing and looking at some of the chevy guys into big plenum manifolds I added another 1 inch spacer.
So with the 2 1 inch spacers, the plate kit,all the gaskets and the thick gaskets between the carb and top of the nos plate im at well over 2.5 inches above the plenum.
Throttle response is better then the oem dual plane in every aspect.
Ive a 7200 chip and it seems to want more, ive tried a 7400 chip and it was still pulling hard, would like to see what a 7600 would do.
IMO the spacers at least on a six pack setup was like night and day.
The long intake stroke (on a stroker) loves a big plenum and on a vac six pack you need to adjust to that fact that the longer stroke will aid in there quick opening compared to a 3.58 stroke.
I think its a very good multi carb intake, not sure how they stack up with a single 4 vs other single 4 intakes though.
The one thing I did not like is with the six pack one end carb is directly over the ports and one is a bit off center.
Now that I have it setup to what I feel is right for my motor its more friendly then an oem intake in every way, as crazy as it may sound I think if I put a person behind the wheel and told them it was a FI setup its responsive enough many would buy into it.
Its easy to launch on all six barrels and there is no hit to feel from a lazy set of end carbs, its instant, no transition to feel because your already there.
Running a plate kit and a fogger kit off a controller is as simple as the rest of the setup.
I angle milled the injector bosses for the foggers, removed the bosses for the non drilled magnum intake, and since indy is so hard to deal with and give very little back I machined the indy/mod man logos off, no free ad. from me.
Its late, im groggy, I have some chassis dyno numbers to go with the spacer plate changes.
Ive 3 modman intakes and several top plates for the diff carbs, if your really wondering id be more then happy to loan one out just to see how they run against other single plane intakes as all I have to revert back to is my modified oem intake and so little is on the web about the pros and cons compared to a std intake/plenum.
I play at 7000-8000 feet above sea level and this intake loves rpm, I wonder how well it would do in good air????
This is my current setup and I dont know what I could do to make it any better, its also an easy manifold to get a perfect port to head match on all 8.
Id really like to see what a single 4 would do vs the top convential? single plane.
![Attached picture 7193164-DSC08826[1].JPG](https://board.moparts.org/ubbthreads/upload2/7193164-DSC08826[1].JPG "7193164-DSC08826[1].JPG")
So I went with a 1 inch spacer and with the 1/2 inch plate kit lower rpm throttle response improved and the powerband changed.
Through reading, research, actual testing and looking at some of the chevy guys into big plenum manifolds I added another 1 inch spacer.
So with the 2 1 inch spacers, the plate kit,all the gaskets and the thick gaskets between the carb and top of the nos plate im at well over 2.5 inches above the plenum.
Throttle response is better then the oem dual plane in every aspect.
Ive a 7200 chip and it seems to want more, ive tried a 7400 chip and it was still pulling hard, would like to see what a 7600 would do.
IMO the spacers at least on a six pack setup was like night and day.
The long intake stroke (on a stroker) loves a big plenum and on a vac six pack you need to adjust to that fact that the longer stroke will aid in there quick opening compared to a 3.58 stroke.
I think its a very good multi carb intake, not sure how they stack up with a single 4 vs other single 4 intakes though.
The one thing I did not like is with the six pack one end carb is directly over the ports and one is a bit off center.
Now that I have it setup to what I feel is right for my motor its more friendly then an oem intake in every way, as crazy as it may sound I think if I put a person behind the wheel and told them it was a FI setup its responsive enough many would buy into it.
Its easy to launch on all six barrels and there is no hit to feel from a lazy set of end carbs, its instant, no transition to feel because your already there.
Running a plate kit and a fogger kit off a controller is as simple as the rest of the setup.
I angle milled the injector bosses for the foggers, removed the bosses for the non drilled magnum intake, and since indy is so hard to deal with and give very little back I machined the indy/mod man logos off, no free ad. from me.
Its late, im groggy, I have some chassis dyno numbers to go with the spacer plate changes.
Ive 3 modman intakes and several top plates for the diff carbs, if your really wondering id be more then happy to loan one out just to see how they run against other single plane intakes as all I have to revert back to is my modified oem intake and so little is on the web about the pros and cons compared to a std intake/plenum.
I play at 7000-8000 feet above sea level and this intake loves rpm, I wonder how well it would do in good air????
This is my current setup and I dont know what I could do to make it any better, its also an easy manifold to get a perfect port to head match on all 8.
Id really like to see what a single 4 would do vs the top convential? single plane.
Posted By: moparclown
Re: smallblock modman intake.. - 05/05/12 11:56 AM
A57 rt
Great info
The one I posted a pic of is going on a small block magnum stroker and the owner is also gonna try a single 4 top in the future(we have the plate already)
Great info
The one I posted a pic of is going on a small block magnum stroker and the owner is also gonna try a single 4 top in the future(we have the plate already)
Posted By: tex013
Re: smallblock modman intake.. - 05/05/12 12:06 PM
A57Rt,
good info i wonder if i could try some spacers on my big block dual quad modman.
i gather your spacers are dual hole not open ?
Tex
good info i wonder if i could try some spacers on my big block dual quad modman.
i gather your spacers are dual hole not open ?
Tex
Posted By: dartman366
Re: smallblock modman intake.. - 05/05/12 02:15 PM
Good info Mark, I am curious about how a single dominator would stack up against the Indy 360-3 that i am running on my 408 now since the strokers seem to like big plenum's and if it would be worth the expense.
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 05:33 PM
68rrman aka dashman on ebay is a great guy for any type spacer at very fair prices, if you look at his ebay site you will see and he can make almost anytihng not listed.
A very nice fella to deal with.
Yes the plates I use are the not open, just the holes, but here again the above mentioned could do you most anything.
Actually ive plans drawn up to plum one of the 1 inch plates or possibly 3 of his singles with foger tip in the end carbs for another mod man project.
Quote:
A57Rt,
good info i wonder if i could try some spacers on my big block dual quad modman.
i gather your spacers are dual hole not open ?
Tex
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 05:35 PM
We have even talked about doing the plate a bit different to run, hide some of the nitrous related plumbing.
But here is my total height...add about 3/8 for total added gaskets as the top are the thick insolated ones when installed on the car.
But here is my total height...add about 3/8 for total added gaskets as the top are the thick insolated ones when installed on the car.
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 05:52 PM
Id really like to see more of these and if some of the terms or ways of thinking may not be the norm or pc its simply Im far from an expert on this and just winged it by trial and error.
Members here like sixpackgut has helped me over the years on some six pack questions and knows about plenum volume or at least is more open to talk about it then others.
Tom Quad and Cab both have great input on six packs
to them all.
I like out of the box thinking and really got on the spacer deal after some dyno work and seeing how spacers worked on the 4bbl motors and wondered how it would carry over.
At first I thought the spacers would look a bit out of place but they really dont and I plumbed the intake wide on the noids to use an oem six pack base.
Yes I dog indy a bit, but who else has such a multi purpose against the grain big plenum intake both big and small block guys can use?
But it is a rough casting and the main intake looks like it was cast with a top/bottom, not many intakes can take a nitrous backfire, this one wont and thats for sure, my little blow off plate is simply for the little hickups so I dont risk a throttle blade sticking or worse.
Ive only popped it twice but it there is alot of fuel/air in that box and im glad its there.
With my current setup being more correct, ive not had that problem but also if a cold start if it acts like its goona, I just kill the master ign switch and it cant get that far.
Ive some BB pics and info I will try to post yet today, ones even a dual efi unit setup for a max wedge motor...not mine but still very nice.
Here is dashmans link...he also has seperate 2300 single plates, but if you email him or call him he can do most anything at a good price imo and the parts are very good quality.
http://www.dashman.net/category.html?id=27
Members here like sixpackgut has helped me over the years on some six pack questions and knows about plenum volume or at least is more open to talk about it then others.
Tom Quad and Cab both have great input on six packs
to them all.I like out of the box thinking and really got on the spacer deal after some dyno work and seeing how spacers worked on the 4bbl motors and wondered how it would carry over.
At first I thought the spacers would look a bit out of place but they really dont and I plumbed the intake wide on the noids to use an oem six pack base.
Yes I dog indy a bit, but who else has such a multi purpose against the grain big plenum intake both big and small block guys can use?
But it is a rough casting and the main intake looks like it was cast with a top/bottom, not many intakes can take a nitrous backfire, this one wont and thats for sure, my little blow off plate is simply for the little hickups so I dont risk a throttle blade sticking or worse.
Ive only popped it twice but it there is alot of fuel/air in that box and im glad its there.
With my current setup being more correct, ive not had that problem but also if a cold start if it acts like its goona, I just kill the master ign switch and it cant get that far.
Ive some BB pics and info I will try to post yet today, ones even a dual efi unit setup for a max wedge motor...not mine but still very nice.
Here is dashmans link...he also has seperate 2300 single plates, but if you email him or call him he can do most anything at a good price imo and the parts are very good quality.
http://www.dashman.net/category.html?id=27
Posted By: dannysbee
Re: smallblock modman intake.. - 05/05/12 06:03 PM
Be neat to make up some 1/2" plenum spacers to do some tuneing on the plenum volume. Also top plate with carb spacers extended into the plenum with tapered holes.
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 06:12 PM
Ive spoken to him about a top plate for the more modified six pack carbs or the mech. units and he can space them out differently.
His name is Ben, I sent him this link, its the weekend but maybe he will chime in on what he has to offer and can produce.
Hes a very unique? setup in several ways to make these things affordable and again the quality of the product is imo perfect.
His name is Ben, I sent him this link, its the weekend but maybe he will chime in on what he has to offer and can produce.
Hes a very unique? setup in several ways to make these things affordable and again the quality of the product is imo perfect.
Posted By: HotRodDave
Re: smallblock modman intake.. - 05/05/12 06:55 PM
I have been thinking about a mod man with a t-quad on a new hemi would be cool.
I bet the big plenum makes a bigger differance with too small of carbs and 7-8000 ft elevation
got to get air in there some how. Big stroker small blocks always seem to go faster with bigger carbs, some are still picking up with 1200 CFM carbs even on combos where they "shouldn't" need it in theory. A bigger plenum does the same thing to a certain extent. It makes the carbs flow more continusly instead of pulses. If you run with no plenum at all (like an individual runner manifold) you would crap yourself thinking about how big of a carb you would need, for example if you heads flow 300 CFM you would need a single venturi carb that could flow 300 CFM or about 2400 CFM total carb capacity. In theory, with a big enough plenum a single 600 CFM carb would be able to feed that same motor because it would flow %100 of the time instead of %25 of the time like it would with no plenum.
I bet the big plenum makes a bigger differance with too small of carbs and 7-8000 ft elevation
got to get air in there some how. Big stroker small blocks always seem to go faster with bigger carbs, some are still picking up with 1200 CFM carbs even on combos where they "shouldn't" need it in theory. A bigger plenum does the same thing to a certain extent. It makes the carbs flow more continusly instead of pulses. If you run with no plenum at all (like an individual runner manifold) you would crap yourself thinking about how big of a carb you would need, for example if you heads flow 300 CFM you would need a single venturi carb that could flow 300 CFM or about 2400 CFM total carb capacity. In theory, with a big enough plenum a single 600 CFM carb would be able to feed that same motor because it would flow %100 of the time instead of %25 of the time like it would with no plenum.
Posted By: A57_RT
Re: smallblock modman intake.. - 05/05/12 07:37 PM
Dave, just wondering who is running the 1200 cfm carbs and what type of performance are they getting, ive a couple strokers out there at low altitudes one in the 10-s, one in the 9-s with no more then a 900-950 single. The 10 second car is a street legal with a smaller exhaust then needed but still in the mid 10-s
I still cant grasp why you feel my carbs are too small, I could bump the center up to a 500cfm unit but I dont see the need.
So in the same respect you would say for instance on the project six pack A12 car with the big block stroker with the mod man and six pack is lacking also???
Not trying to bust balls here, just trying to understand, but if what your saying is my carbs are too small at 410 inches, there are alot of BB strokers or BB owners period that one would think the owners would be crying there eyes out and tossing the six pack for a single, but there not.
My carbs are modified 440 based carbs and id say would outflow many other six pack setups, hell I still need to mill my choke area off my center carb.
Just a bit confused...but at the same time ive never had a single 4 on any of my 3 small block strokers and thats why im interested in your thoughts on the six pack setups.
I still cant grasp why you feel my carbs are too small, I could bump the center up to a 500cfm unit but I dont see the need.
So in the same respect you would say for instance on the project six pack A12 car with the big block stroker with the mod man and six pack is lacking also???
Not trying to bust balls here, just trying to understand, but if what your saying is my carbs are too small at 410 inches, there are alot of BB strokers or BB owners period that one would think the owners would be crying there eyes out and tossing the six pack for a single, but there not.
My carbs are modified 440 based carbs and id say would outflow many other six pack setups, hell I still need to mill my choke area off my center carb.
Just a bit confused...but at the same time ive never had a single 4 on any of my 3 small block strokers and thats why im interested in your thoughts on the six pack setups.
Posted By: HotRodDave
Re: smallblock modman intake.. - 05/05/12 11:06 PM
You can do either one, bigger carbs or bigger plenum. Not saying your carbs are too small but when you increase plenum it effectively does the same thing a bigger carb does and visa-versa, it allows more flow through the system. If you are running a real small plenum you tend to go faster when you add a bigger carb, if you are running small carbs you typically can run faster by adding plenum volume. It is more a matter of perspective than it is one way being right or wrong. A plenum buffers the pullses from the cylinders reaching the carbs, if the carbs can't flow enough under a pulsateing flow then a bigger plenum tends to allow them to flow continuously and act bigger. I would bet that if you were haveing hood clearance issue stacking all those spacers you could switch to a bigger cab and see the same gains.
I think the mod man intake is VERY well suited to a six pack carb set up, way better than the factory pile of junk. Fuel distribution sucks in a stock intake, they tend to run good because of the raw flow but they are not a very efficent set up, the mod man should be real good with the center carb pleced right in the center at part throttle then when the secondaries open up they dump straight down into the port totally un obstructed with no funky turns to induce fuel seperation.
I think the mod man intake is VERY well suited to a six pack carb set up, way better than the factory pile of junk. Fuel distribution sucks in a stock intake, they tend to run good because of the raw flow but they are not a very efficent set up, the mod man should be real good with the center carb pleced right in the center at part throttle then when the secondaries open up they dump straight down into the port totally un obstructed with no funky turns to induce fuel seperation.
Posted By: HotRodDave
Re: smallblock modman intake.. - 05/05/12 11:14 PM
Did you know that the 350 CFM holley flows less than 1/2 what a 600 CFM 4150 flows at the same depression? It also has smaller throttle bores and venturi than the 600 
Posted By: HotRodDave
Re: smallblock modman intake.. - 05/05/12 11:15 PM
Oh and the 500 CFM holley is exactly 1/2 a 750 4150 and does not have the nicely contoured entry
Posted By: A57_RT
Re: smallblock modman intake.. - 05/06/12 01:00 AM
My questions were still not answered, are in your opinion are the BB stroker six pack people with a mod man or even a bigger plenum sheet metal intake going the wrong way?
Whos running 1200 cfm on a small stroker and what are the results.
All this theroy stuff is great but remember about 300bc in theroy the world was still flat.
Recently in theroy the north koreans rocket launch should of worked.
I love a good debate but can say its been proven a good six pack setup can flow over 900cfm in 4bbl terms, back at 1300 feet above sea level in theroy to run 7400 rpm I need right at 900cfm and feel it could pull 7600. I feel I can pull 950 cfm from my setup in 4bbl standards, more if they were sleeved.
All I can say is if you have never had a six pack setup, your missing out because all the theroy talk imo goes out the window just like the world is flat imo.
There is a reason why both small block strokers and BB strokers run six packs, they work. There is a reason the sheet metal intakes with a six packs and larger plenums then the mod man run so hard....
I simply cant agree that so many running six pack strokers on these sheet metal manifolds with even larger plenums are shooting themselves in the foot.
I think I need to loan out a single 4 setup so we can get some info on what the manifold does with a 950 or so, or larger????? But I feel the intakes made more for a six pack or 2x4s the way its setup. Only testing will tell.
Whos running 1200 cfm on a small stroker and what are the results.
All this theroy stuff is great but remember about 300bc in theroy the world was still flat.
Recently in theroy the north koreans rocket launch should of worked.
I love a good debate but can say its been proven a good six pack setup can flow over 900cfm in 4bbl terms, back at 1300 feet above sea level in theroy to run 7400 rpm I need right at 900cfm and feel it could pull 7600. I feel I can pull 950 cfm from my setup in 4bbl standards, more if they were sleeved.
All I can say is if you have never had a six pack setup, your missing out because all the theroy talk imo goes out the window just like the world is flat imo.
There is a reason why both small block strokers and BB strokers run six packs, they work. There is a reason the sheet metal intakes with a six packs and larger plenums then the mod man run so hard....
I simply cant agree that so many running six pack strokers on these sheet metal manifolds with even larger plenums are shooting themselves in the foot.
I think I need to loan out a single 4 setup so we can get some info on what the manifold does with a 950 or so, or larger????? But I feel the intakes made more for a six pack or 2x4s the way its setup. Only testing will tell.
Posted By: A57_RT
Re: smallblock modman intake.. - 05/06/12 01:10 AM
To answer the question TEX013 on the big dual 4-s, this is some of Bens recent work.....Talk about flow... 
Posted By: HotRodDave
Re: smallblock modman intake.. - 05/06/12 01:29 AM
Some reason you are haveing a really hard time understanding what I am saying. If a carb is too small then they run better with big plenums, that is exactly what you are finding out. A big plenum is a great way to make a smallish carb make power, I don't see why that is so hard to understand. Six packs are fine, I don't know why you think I am trying to convince you to get rid of it, if you want to keep it just keep adding plenum, I was just explaining why you keep picking up power. I even agree the mod man would be better for a 6 pack or especially dual 4s than it would be for a single 4 as the outside cylinders would probably get less fuel than the centers.
Posted By: tex013
Re: smallblock modman intake.. - 05/06/12 02:47 AM
A57RT,
thanks again.the current dual 4 has 4 holes per carb.thanks for the link,i have seen those spacers on ebay in regards my mates 510ci six pack.
would that top allow use of holley type carbs on the modman ??
i would think a 1" 4 hole spacer may pick up signal over the open.
Dave i see and understand what you mean re spacer/plenum/carb size.i have done similar myself
Tex
thanks again.the current dual 4 has 4 holes per carb.thanks for the link,i have seen those spacers on ebay in regards my mates 510ci six pack.
would that top allow use of holley type carbs on the modman ??
i would think a 1" 4 hole spacer may pick up signal over the open.
Dave i see and understand what you mean re spacer/plenum/carb size.i have done similar myself
Tex
Posted By: sixpackgut
Re: smallblock modman intake.. - 05/06/12 03:48 AM
Mark, that lid for holleys is NICE!!!
what Dave was trying to say is experimenting with plenum spacers would be something worth trying. I think your confusing carb spacer and a plenum spacer in the convertsation. stcking hole spacers to me would just increase signal to the carbs and posibly help atomization before it hits the plenum which i would think would be helpful with a center carb in the middle of the large plenum
what Dave was trying to say is experimenting with plenum spacers would be something worth trying. I think your confusing carb spacer and a plenum spacer in the convertsation. stcking hole spacers to me would just increase signal to the carbs and posibly help atomization before it hits the plenum which i would think would be helpful with a center carb in the middle of the large plenum
Posted By: HotRodDave
Re: smallblock modman intake.. - 05/06/12 04:19 AM
Those carb spacers (even the hole type)are effectively adding to the plenum, I assumed everyone realized that. There may be other benifits from the shapes like atomization or fuel distrubution but the main thing they do is add plenum volume.
Posted By: sixpackgut
Re: smallblock modman intake.. - 05/06/12 04:51 AM
I dont really agree that a hole spacer is adding plenum volume. IMO it would just be adding length to the carb and would in no way make a carb seem larger to the engine as an open spacer would. this is just my opinion, in no way should i be considered an expert
Posted By: A57_RT
Re: smallblock modman intake.. - 05/06/12 09:56 AM
I understand Dave, I took a break and re read things, im just dam hard headed at times.
As far as the carb spacers adding p volume as some feel it does add a little and as Ray pointed out in some ways it dont.
I have read both, but what I was wanting to hear I did about increasing carb sig. which explans the better throttle response.
Ray, that top plate Ben made is one of his first like that, its my understanding he would/will change a few things on the next one but as we emailed or pm-ed a good bit ago hes will to try anything and can move the carb spacing on a six pack plate.
Ive not seen many carb spacers work past a certain point so fo now Im just gonna run with whats seems to work well and as much as I hate to admit it yes two big 4-s would move alot more air/fuel I just wonder what it would feel like at lower rpms.
As far as the carb spacers adding p volume as some feel it does add a little and as Ray pointed out in some ways it dont.
I have read both, but what I was wanting to hear I did about increasing carb sig. which explans the better throttle response.
Ray, that top plate Ben made is one of his first like that, its my understanding he would/will change a few things on the next one but as we emailed or pm-ed a good bit ago hes will to try anything and can move the carb spacing on a six pack plate.
Ive not seen many carb spacers work past a certain point so fo now Im just gonna run with whats seems to work well and as much as I hate to admit it yes two big 4-s would move alot more air/fuel I just wonder what it would feel like at lower rpms.