Gallileo60
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Jul 15, 2018
Not sure if this is the place for this post, but here goes.....Is there any kind of cold air kit for a carbed 305 1989 RS????Were any of these put out with dual snorkel, or cool air from the factory???? If not has anyone made their own???If so , I would love to have the details............Thanks for any help on this............Tom Shaw
i dont think they had dual snorkels but the 1984 z28 305 h.o did
Gallileo60
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Jul 15, 2018
Thanks, i will keep that in mind
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Straight off of the front page Tech Articles:
Quote:
One of the more sought after parts for carbed V8 3rd gens is the 305 H.O. dual snorkel air cleaner. I wanted one and looked around local junkyards but never found any. I called GM and they wanted almost $300 for a new one, and there was no way i would pay that much for one. So i decided i'd try and make my own. Here is how i made mine.
* The first thing i did was i went down to the junkyard and picked up 2 complete stock air cleaners. Make sure you leave the one that you have on your car now alone, just in case something goes wrong, you will still have one that works.
* The first thing i did, was to take one of the cleaners and cut off the snorkel thermac valve. Leave the thermac setup on the drivers side of one of the cleaners. You will need it so you can still attach the factory plastic elbow that goes up to the front of the engine bay.
* Then, using a dremel tool (a hacksaw will work as well), cut the snorkel off the cleaner.
* When you cut it off, cut from the top lip of the cleaner all the way to the bottom on both sides of the snorkel. It is important to leave roughly 1" of material around where the snorkel attaches to the air box. This extra 1" is needed so you can eventually drill 4 holes into it for the rivets that will hold the second snorkel to the air box.
* Once you have the snorkel cut off, put the extra air cleaner on the carb.
* Take the cut off snorkel and place it up to the cleaner and line out a spot where the second snorkel will go. Make sure that the second snorkel doesn't interfere with any fuel lines, carb linkage or heater hoses.
* Once you have a spot picked out for the snorkel to go, mark that area off, and then clamp the second snorkel to the air cleaner.
* Take the cleaner off the carb.
* Take some spray paint and spray it down the clamped on second snorkel. This will paint a spot on the air box. The area that has paint on it will have to be removed so that air can flow into the air cleaner. I used a cut off disc on the dremel, to cut out the area for the hole.
* Once the hole is cut, re-clamp the snorkel back on the air cleaner lined up with the lines you made before.
* Now that there is a hole in the cleaner, you should be able to see the hole of the snorkel. You will proballay have to go back and remove some material from the cleaner box so that the hole on the snorkel and the hole in the cleaner box is the same size.
* Now that you have the holes cut, it is time to attach the snorkel to the cleaner box. Depending on what you want to do, you can either use rivets or spot weld the snorkel to the cleaner. I drilled 4 holes in the extra metal around the snorkel and put rivets in them.
* Once the snorkel is on, you MUST make sure to clean the cleaner out! The box will be filled with metal shavings and it won't take all that many to cause a significant amount of damage to your motor.
Tips to help out
If emmissions aren't a concern, try and find a late 70s air cleaner off of a GM car that uses a QJet. They have an inlet that is alot larger than the stock inlet. Also, the stock 305 H.O. use these larger inlets. GM sells plastic elbows that will attach to these inlets, but will still use the stock air scoop on the drivers side. You can also buy an air scoop for the passengers side
If you don't want to buy the elbow from GM, you could get a 4" metal ducting hose (the kind used on the back of dryers) at Home Depot. You could clamp this to the snorkel and duct it up to the front of the car. I did this on my car and attached it in behind the passenger side high beam light. I removed the light and made a home made ram-air system.
The Bottom Line
So, after all this work, i bet you are thinking "Well, how good is this this thing and is it worth it?". I can't say how well it will work in your car but, I managed nearly a full .5 second decrease in ET!.
If you have any questions about this how to article, please send me an email at vandeven@worldchat.com and i will try to answer any questions that you have
One of the more sought after parts for carbed V8 3rd gens is the 305 H.O. dual snorkel air cleaner. I wanted one and looked around local junkyards but never found any. I called GM and they wanted almost $300 for a new one, and there was no way i would pay that much for one. So i decided i'd try and make my own. Here is how i made mine.
* The first thing i did was i went down to the junkyard and picked up 2 complete stock air cleaners. Make sure you leave the one that you have on your car now alone, just in case something goes wrong, you will still have one that works.
* The first thing i did, was to take one of the cleaners and cut off the snorkel thermac valve. Leave the thermac setup on the drivers side of one of the cleaners. You will need it so you can still attach the factory plastic elbow that goes up to the front of the engine bay.
* Then, using a dremel tool (a hacksaw will work as well), cut the snorkel off the cleaner.
* When you cut it off, cut from the top lip of the cleaner all the way to the bottom on both sides of the snorkel. It is important to leave roughly 1" of material around where the snorkel attaches to the air box. This extra 1" is needed so you can eventually drill 4 holes into it for the rivets that will hold the second snorkel to the air box.
* Once you have the snorkel cut off, put the extra air cleaner on the carb.
* Take the cut off snorkel and place it up to the cleaner and line out a spot where the second snorkel will go. Make sure that the second snorkel doesn't interfere with any fuel lines, carb linkage or heater hoses.
* Once you have a spot picked out for the snorkel to go, mark that area off, and then clamp the second snorkel to the air cleaner.
* Take the cleaner off the carb.
* Take some spray paint and spray it down the clamped on second snorkel. This will paint a spot on the air box. The area that has paint on it will have to be removed so that air can flow into the air cleaner. I used a cut off disc on the dremel, to cut out the area for the hole.
* Once the hole is cut, re-clamp the snorkel back on the air cleaner lined up with the lines you made before.
* Now that there is a hole in the cleaner, you should be able to see the hole of the snorkel. You will proballay have to go back and remove some material from the cleaner box so that the hole on the snorkel and the hole in the cleaner box is the same size.
* Now that you have the holes cut, it is time to attach the snorkel to the cleaner box. Depending on what you want to do, you can either use rivets or spot weld the snorkel to the cleaner. I drilled 4 holes in the extra metal around the snorkel and put rivets in them.
* Once the snorkel is on, you MUST make sure to clean the cleaner out! The box will be filled with metal shavings and it won't take all that many to cause a significant amount of damage to your motor.
Tips to help out
If emmissions aren't a concern, try and find a late 70s air cleaner off of a GM car that uses a QJet. They have an inlet that is alot larger than the stock inlet. Also, the stock 305 H.O. use these larger inlets. GM sells plastic elbows that will attach to these inlets, but will still use the stock air scoop on the drivers side. You can also buy an air scoop for the passengers side
If you don't want to buy the elbow from GM, you could get a 4" metal ducting hose (the kind used on the back of dryers) at Home Depot. You could clamp this to the snorkel and duct it up to the front of the car. I did this on my car and attached it in behind the passenger side high beam light. I removed the light and made a home made ram-air system.
The Bottom Line
So, after all this work, i bet you are thinking "Well, how good is this this thing and is it worth it?". I can't say how well it will work in your car but, I managed nearly a full .5 second decrease in ET!.
If you have any questions about this how to article, please send me an email at vandeven@worldchat.com and i will try to answer any questions that you have
Gallileo60
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Jul 15, 2018
Awesome info, and a good idea.Junkyard here I come...Thanks.
five7kid
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May 4, 2026
Quote:
For the record, there was no carbed 1989 from the factory.Originally Posted by Gallileo60
... a carbed 305 1989 RS????Were any of these put out with dual snorkel, or cool air from the factory???? Gallileo60
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Jul 15, 2018
Well it certainly looks like a carb to me, kinda like a quadrajet...I think it is an electronic carb, but could be wrong...What DID come on the 89 305 from the factory???? Thanks for setting me straight on whatever this is....Tom
Moderator
The last year for factory carbs was 1987. Later years only had TBI or TPI.
five7kid
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May 4, 2026
If stock, it's "TBI" - "Throttle Body Injection". From the outside, it resembles a carb, but the internals are completely different.
So, that being said, let's send you to the place that will be the most help to you. . .
So, that being said, let's send you to the place that will be the most help to you. . .
Gallileo60
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Jul 15, 2018
Well, Thanks for all the info guys..................
Junior Member
You could do something like this and use 3 1/2"OD tubing.
TBI Cold Air Intake how to - S10Forum.com
I did it to my 2.8tbi s-10 and it works pretty good if you have hood clearance.
TBI Cold Air Intake how to - S10Forum.com
I did it to my 2.8tbi s-10 and it works pretty good if you have hood clearance.
Member
I had this on my car for a while, dont know if it did anything, check it out below:
https://www.thirdgen.org/forums/tbi/...ir-intake.html
https://www.thirdgen.org/forums/tbi/...ir-intake.html
Senior Member
Here is my cool air thread
https://www.thirdgen.org/forums/tbi/...?highlight=air
https://www.thirdgen.org/forums/tbi/...?highlight=air
Gallileo60
Supreme Member
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Jul 15, 2018
Man guys,Thanks for all the replys...Think im going to cool my air down...lol....Tom
Junior Member
Has anyone tried adding more tubing to the stock single air cleaner and routing it to a wheel well, remove the internal round airfilter, and fashion on a K&N adapter ring that a K&N filter would fit on at the end where the usual under-the-light scoop is? Seems like a pretty good poor-man cold air intake to me. You would probobly need a de-smogged car though (too much plumbing in the way).
Gallileo60
Supreme Member
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Jul 15, 2018
hey okmaro
not a bad idea..............Anyone on here try that or what??????????
not a bad idea..............Anyone on here try that or what??????????
Member
I know that there has been people that get a dual snorkel air cleaner, and run tubes from each snorkel to the grill where there is two air flow tubes that direct air to the radiator. Do some search, i know i saw it on this site somewhere.
Senior Member
Quote:
The part where the thermac valve is very narrow and in my opinion quite restrictive. Ditch it.Originally Posted by okmaro
Has anyone tried adding more tubing to the stock single air cleaner and routing it to a wheel well, remove the internal round airfilter, and fashion on a K&N adapter ring that a K&N filter would fit on at the end where the usual under-the-light scoop is? Seems like a pretty good poor-man cold air intake to me. You would probobly need a de-smogged car though (too much plumbing in the way).