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Do a open plenum, spreadbore (Q-jet), manifold exist?

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Old Jul 31, 2004 | 08:07 PM
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Car: 87 Black Formula
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Transmission: 700R4
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Do a open plenum, spreadbore (Q-jet), manifold exist?

I got me a nos plate kit, and where going to mount it today. First problem I got was that I realized I needed an open pleum manifold. The dumb thing here was that on NOS's site, they didn't mention this fact, other that with the cheater's high power, the power was "so large a open plenum is reccomended."

Reccomended means not mandatory, right?

On the sniper, powershot and super powershot, all plate kits, none of this was mentioned, so I thought with some smaller jets on the cheater, it would be the same. But it wont work with a dual plenum at all, none of them.

Now I need an open plenum manifold for a Q-jet. I looked on ebay, at summit racing. None. Do it even exist?
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Old Aug 1, 2004 | 12:05 AM
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Yes I am sure that they exist. Have you checked a summit catalog? They have an awful lot of intakes listed. No way to make some modifications to yours to allow it to work, huh?
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Old Aug 1, 2004 | 02:16 PM
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Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
I went thru scoggin dickey, ebay and summit, didn't find any, although it might excist... came to think of some of those dual pattern manifolds, they should work, only I can't seem to locate any with an open plenum.

No you see the bar across the intake plenum wich sprays the nitrous and gas, goes from front of car backwards, and thats just exsactly where the dual plane manifolds divide the plenum in two. Stupid me took it for granted that the spray bar went across sideways so the only part it couldn't spray was a small spot right above the divider in the middle.
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Old Aug 1, 2004 | 02:21 PM
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From: Mercedes Norte, Heredia, Costa Rica
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Stick a spacer on, then you'll need the hood clearance.
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Old Aug 1, 2004 | 02:31 PM
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Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
A spacer don't seem to be all that good idea, since the stock manifold only has 2 small and 2 it larger round holes. I don't have a regular dual plenum at this time.
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Old Aug 1, 2004 | 03:12 PM
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A spacer don't seem to be all that good idea, since the stock manifold only has 2 small and 2 it larger round holes. I don't have a regular dual plenum at this time.
If this engine is totally stock, it may not be a good idea to go spraying it anyway. How many miles are on it?
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Old Aug 1, 2004 | 04:19 PM
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From: New Jersey
Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
80 000 km, don't know how many miles that is, but a stock engine is supposed to handle up to a 150hp shot easily and safely. Anyways, thats another matter alltogether.
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Old Aug 3, 2004 | 08:31 AM
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Car: 1984 LG4 Camaro
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Weiand Team G Streetram
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Old Aug 4, 2004 | 08:55 PM
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Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
Originally posted by tilstad
80 000 km, don't know how many miles that is, but a stock engine is supposed to handle up to a 150hp shot easily and safely. Anyways, thats another matter alltogether.
did they say that on the same site you got the info on the manifold on too .....lol...better watch out...lol
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Old Aug 4, 2004 | 10:39 PM
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Are you familiar with exactly how nitrous works? 80k is a lot of miles on a stock engine to be spraying it into. This isn't "Fast and the Furious" here, you will smoke an engine quick if it isn't up to par.
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Old Aug 4, 2004 | 10:47 PM
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From: Staunton,illinois
Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
can you say BA BOOM i knew you could .......
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Old Aug 5, 2004 | 01:21 AM
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Car: 1987 IROC-Z
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Originally posted by Lonestar
Are you familiar with exactly how nitrous works? 80k is a lot of miles on a stock engine to be spraying it into. This isn't "Fast and the Furious" here, you will smoke an engine quick if it isn't up to par.
Didn't have that problem on my 87 305ci tpi with a 150hp shot, did I mention it had 192,000 miles? No my car isn't fast and furiouse, well.. ok it was .

I didn't get many runs in on it though, I traded the car for another.
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Old Aug 5, 2004 | 01:31 AM
  #13  
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Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
Ok, it was funny for a while. But I asked about the manifold, not to be insulted. 80k kilometers is about 50 000 american miles.

And yes, Nos DO state that a v8 can handle up to a 140hp shot easily, safely, and without worries.I have bought and read several books on the matter, the last one by Joe Pettit sold by summit racing. I know all about the ratarted timing, fuel safety setups, how to calculate jets according to fuel pressure, the colder plugs, ignition retard boxes, the need to read plugs etc etc.

I just wanted a simple answer about the manifold.
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Old Aug 5, 2004 | 01:38 AM
  #14  
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From: New Jersey
Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
5SiZ, do you have any idea if a plate system could be used with a dual plenum manifold like a performer rpm? I asked a NOS's tech, but didn't get an answer on that, at least not yet.

I was going to convert to injection this winther, that's why it was a bummer to have to buy a new manifold now. Not sure if I even are going to, perhaps just sell it and spend the money on something else.

Last edited by tilstad; Aug 5, 2004 at 01:45 AM.
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Old Aug 6, 2004 | 11:47 AM
  #15  
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Car: Trans Am
Engine: chevy 350
Transmission: 700R4
"I was 5SIZ this is my new handle"

I just bought this car like 2 days ago so I have no idea. I would imagine that it is very possible with the right application plate, but as too witch one I have no idea.

sorry dude, but when ya find out let me know pm me so I can get it also.
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Old Aug 7, 2004 | 09:05 PM
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You guys chicken littling the nitrous probably though the "Ive seen the way you drive, youll blow yourself up!" line in fast and furious was great.
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Old Aug 7, 2004 | 09:52 PM
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You guys chicken littling the nitrous probably though the "Ive seen the way you drive, youll blow yourself up!" line in fast and furious was great.
??????
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Old Aug 7, 2004 | 09:53 PM
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From: Staunton,illinois
Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
where did that come from?
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Old Aug 7, 2004 | 11:16 PM
  #19  
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because nitrous is perfectly safe when used correctly, you dont have to have a brand spanking new motor to use it any more than you have to have a brand spanking new motor to put in a better cam, better heads, etc
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Old Aug 7, 2004 | 11:29 PM
  #20  
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From: Staunton,illinois
Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
but you also have to remember that by putting in a new cam or heads etc..wont instantly blow up an engine like nitros could when you use it the first time ......
there are alot of "kids" that think hey i can get 150 extra hp with this nitros kit and then a week later wonder why thier car is dead ......
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Old Aug 8, 2004 | 07:51 AM
  #21  
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From: New Jersey
Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
Perhaps you should consider getting another crack dealer, 'cause nitrous wont instantly blow up an engine just by chance. Its when used wrong, it may cause problems.

Anyways, the explosiveness of nitrous has nothing to do with the manifold I asked about in the first place.
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Old Aug 8, 2004 | 08:11 AM
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From: Loudon, NH
Car: 67 Chevy, 2000 Pontaic GTP
Engine: 415SBC Holley Stealth Ram
Transmission: 700R4
The Weiand TeamG part number Part #: 7525
Attached Thumbnails Do a open plenum, spreadbore (Q-jet), manifold exist?-7525.jpg  
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Old Aug 8, 2004 | 09:48 AM
  #23  
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From: Staunton,illinois
Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
Originally posted by tilstad
Perhaps you should consider getting another crack dealer, 'cause nitrous wont instantly blow up an engine just by chance. Its when used wrong, it may cause problems.

Anyways, the explosiveness of nitrous has nothing to do with the manifold I asked about in the first place.

perhaps i should get another crack dealer???

never said nitros would instantly blow up an engine just by chance i said it could and ive never seen a cam or head cause an engine to blow up by using it wrong....LMAO ....

learn to read before trying to flame someone next time ......
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Old Aug 8, 2004 | 09:56 AM
  #24  
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From: New Jersey
Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
Thanks for the part number on the wiand team G. Now if I could only locate a good used one i'll be set.

I'll refrase the crack dealer part to "try to stay on topic" the next time.
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Old Aug 8, 2004 | 10:25 AM
  #25  
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From: Staunton,illinois
Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
yes the team g intake is a good intake indeed .....

and i appreciate you choosing different wording next time ......

i dont think nitros is all bad im just saying its not like putting new heads or cam in an engine not even a close comparison to the longevity of the engine .....lots of guys will blow an engine by MISUSING nitros ...its not at all like a head or cam change on an older engine
Attached Images  

Last edited by THEGENERAL; Aug 8, 2004 at 10:42 AM.
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Old Aug 8, 2004 | 10:31 AM
  #26  
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From: New Jersey
Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
I'm quite aware of all those aspects, but now I have a spankin brand new NOS kit in my garage and was hoping to use it this summer before an engine build in the near future.
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Old Aug 8, 2004 | 10:46 AM
  #27  
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From: Staunton,illinois
Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
like i said theres nothing wrong with nitros if you use it correctly...

just too many people misuse it severly and then wonder "why did my engine blow up ??" but if you use your head and dont try and over do it it should last for quite some time ....

the new engine your rebuilding what are the specs you have in mind for it ?
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Old Aug 8, 2004 | 10:58 AM
  #28  
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From: New Jersey
Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
Need to sell my Harley first, its advertised already, and I'm moving to a less expensive place, now I live alone in a house who sucks up all my money.

The HD should pay for a dart block, 4.125 bore, and 4 inch stroke making it a 427. I may go with a World products block instead, at least they answer my emails when I have questions. After that Afr heads, and lt1/4 FI + a entry level nos kit. Not trying to make a race car out of it, just a nice to drive street machine with big block torqe and some topend too.

But it is a long term project, as of now the biggest problem is getting the heavy block over the pond without paying loads in tax and freight. It seems to be the cheapest solution to take a charter trip to the US, get a block delivered to , or nearby the hotel, and pay for the added luggage weight on the plane. then I don't have to pay 25% in retailtax and get a trip as a bonus. Here they sell those blocks for $6250, so it's quite alot to save on it.
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Old Aug 8, 2004 | 11:11 AM
  #29  
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From: Staunton,illinois
Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
wow id say so .... id say shipping is quite high ....not to many used blocks over there to choose from i guess either ??
sounds like a good plan thou should be a real runner when you finally get it done ....
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Old Aug 8, 2004 | 11:18 AM
  #30  
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From: New Jersey
Car: 87 Black Formula
Engine: Rollercammed Lg4
Transmission: 700R4
Axle/Gears: 3.23 10 Bolt Locker
Well, I have seen som old 400 blocks, and they go for about $1000. But then you need to bore it, align hone etc etc. And the price would soon be up to about $2000 before you can use it. And then you got the whole situation about core shift, and cracking problems on those blocks.

It's about 2 grand for a Dart block also, brand new, and fully prepped and honed. Then you only need to get it home without being stiffed for all your money. If I only need to pay the added weight on the plane, the trip is a holiday, then it would be a much better value than getting an old block.
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Old Aug 8, 2004 | 06:40 PM
  #31  
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From: Staunton,illinois
Car: 1966 impala , 1998 sebring vert,1978 buick regal turbo, 1991 chevy silverado 3/4ton 4x4 lifted
Engine: 283, 2.5,3.8 turbo 350
Transmission: powerglide,auto overdrive, th350,4L80
heck yeah it would well enjoy your trip and have a good time when over here ...
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