intakes and TBI's

intakes and TBI's

Postby cybrvanr [OP] » August 4th 2010, 1:23pm

I was looking at the FAQ that MadMax had posted about modding the 4.3, and had an intake suggestion. I am running the Holley 670 TBI on my 1988 van, and have not had much trouble with it. I bought it after my stock TBI had the injectors go bad. I had to solder on a different connector to the injectors, and the fuel pressure regulator came mis-calibrated, but after I got the metal disc out of the pressure regulator and was able to adjust it, I've been using it for years now. I also needed to monkey with the TPS to get it optimal too, but with that little bit of tuning, I was able to dial it right in. I noticed however that the stock intake manifold restricted the throttle bore back down to the stock size, so I went searching for an intake manifold that would give me the full benefit, and I found it at the boneyard!

The intake manfold you are looking for is on the 1985 Astros! This is the only year astros were equipped with a quadra-jet. That carb is a big 650 CFM monster, with a nice hi-rise intake to match! I replaced the stock TBI intake with the boneyard 4-barrel intake, and then I purchased a TBI to spread-bore adapter plate, and slapped my Holley right on top! :layrubber:
1988 Astro CL 5-speed 4.3 TBI
2000 Astro AWD LS
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Re: intakes and TBI's

Postby chevy57bert » August 4th 2010, 6:24pm

I thought that only the 4 barrel carb on a 85 was made in the first 2 month off that year. a rare find i would say...
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Re: intakes and TBI's

Postby Gary » August 5th 2010, 1:31am

Bert,not sure about only two months of 1985 having four barrels.I thought all 1985's had them.I know Ole Yellar has one.I thought the four barrels on the 1985's was a 450 cfm.
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Re: intakes and TBI's

Postby chevy57bert » August 5th 2010, 8:09am

Gary wrote:Bert,not sure about only two months of 1985 having four barrels.I thought all 1985's had them.I know Ole Yellar has one.I thought the four barrels on the 1985's was a 450 cfm.


Check your date off `Ole Yellar`production. Maybe that clears something up....
Dirk told me he had problems with the Inspection, they told him there where no carb engines for 85 astro`s.
So he did a search and came up with first 2 months with carbs.
Maybe he can confirm this.. He has an original 4 barrel carb engine.
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Re: intakes and TBI's

Postby cybrvanr [OP] » August 5th 2010, 8:35pm

I know several people that have owned carb'ed Astros. I have a friend with a conversion van, and my father did to. I have a spare 4-barrel intake in the garage right now that I'll hafta shoot some pictures of. After I pulled the one I used on my 1988, I was just nosing thru and found another carb'ed 1985 Astro and yanked it's intake too!
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Re: intakes and TBI's

Postby Gary » August 6th 2010, 5:38am

cybrvanr wrote:I know several people that have owned carb'ed Astros. I have a friend with a conversion van, and my father did to. I have a spare 4-barrel intake in the garage right now that I'll hafta shoot some pictures of. After I pulled the one I used on my 1988, I was just nosing thru and found another carb'ed 1985 Astro and yanked it's intake too!


Given the fact I drive both a van with CPI and the Ole Yellar with a carb,I got to say the CPI has lot more guts to it.And because you have a rare 5speed and the 2000,I would think you would have noticed the same that the 2000 has more guts as well.

I am thinking I have mixed feelings about you changing the 1988 5 speed and maybe the value of it as well.If anything,might be worth looking into a update in a CPI and not going what could be precieve(sp) as a backward move to a carb.Once you accept that the fuel injected engines are much better overall and the supporting systems for them is something you need to learn,I don't think you would be so inclined to go back to a carb. :2:
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Re: intakes and TBI's

Postby bkmorency13 » August 29th 2010, 9:11pm

i always figured these tbi units to be junk. i mean, 2 injectors pointed down a carb? and carburetors offer so much more for performance. i would like to convert to carb but have to figure a way around this emissions crap. get rid of all this smog and recycling of burned gasses. only fresh are should go into a motor. atleast if you want performance and better fuel mileage. doesnt make sense to me, burn your old gasses to help keep the air cleaner or burn less fuel with a little more pollution. just going to have to do the registration dance after i get that v8 in.
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Re: intakes and TBI's

Postby Phantom » August 29th 2010, 10:25pm

cybrvanr wrote:I was looking at the FAQ that MadMax had posted about modding the 4.3, and had an intake suggestion. I am running the Holley 670 TBI on my 1988 van, and have not had much trouble with it. I bought it after my stock TBI had the injectors go bad. I had to solder on a different connector to the injectors, and the fuel pressure regulator came mis-calibrated, but after I got the metal disc out of the pressure regulator and was able to adjust it, I've been using it for years now. I also needed to monkey with the TPS to get it optimal too, but with that little bit of tuning, I was able to dial it right in. I noticed however that the stock intake manifold restricted the throttle bore back down to the stock size, so I went searching for an intake manifold that would give me the full benefit, and I found it at the boneyard!

The intake manfold you are looking for is on the 1985 Astros! This is the only year astros were equipped with a quadra-jet. That carb is a big 650 CFM monster, with a nice hi-rise intake to match! I replaced the stock TBI intake with the boneyard 4-barrel intake, and then I purchased a TBI to spread-bore adapter plate, and slapped my Holley right on top! :layrubber:


was that a 350 v8? 650 CFM on a V6 seems like a bit too much for a 6
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Re: intakes and TBI's

Postby chevy57bert » August 29th 2010, 10:47pm

If I would run a 500 cfm on my V8 :mrgreen: , but it would much better to set-up the TBI , with all the ECM troubles you have with the Carb..
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Re: intakes and TBI's

Postby Zebediah III » August 30th 2010, 3:46am

The TBI's are really hard to beat for reliability.
Going to a carb is kind of backwards, but it's personal preference
so if you're into carburetors have at it!

If you start buying adapters and messing with the 4.3 a lot
you are using money that could go into a swap for a V-8.
I see the stock 4.3 as perfectly adequate for these mid size
vans and blazers/S-10s etc, but once you start modifying a
lot of stuff, you could have got a running truck with a 350 off
Craigslist and started on a swap and have two extra cylinders
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Re: intakes and TBI's

Postby Gary » August 30th 2010, 3:55am

Read "Chops" build thread and his carb conversion.He told me in person how he regretted that move.
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Re: intakes and TBI's

Postby Zebediah III » August 30th 2010, 4:16am

I hardly miss the old days of rebuilding my carb every year or sooner. Saturated floats, bad needle and seats, screwed up idle circuits, flooding.
I don't miss that. Running a car too rich can be doom for an engine too. I don't imagine carburetors are going to agree too well with the increases
in ethanol they are pushing either. Fuel is bad enough now, I don't like the thought of it getting worse
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Re: intakes and TBI's

Postby 94 Van Guy » August 30th 2010, 4:27am

I'm still waiting for the introduction of the non-internal combustion engine. The one that runs at 96% efficient, gives off no heat and gets about 100 miles on a pint of water. Like I said, I'm still waiting.
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Re: intakes and TBI's

Postby rev_les » August 30th 2010, 6:13am

Zebediah III wrote:I hardly miss the old days of rebuilding my carb every year or sooner. Saturated floats, bad needle and seats, screwed up idle circuits, flooding.
I don't miss that. Running a car too rich can be doom for an engine too. I don't imagine carburetors are going to agree too well with the increases
in ethanol they are pushing either. Fuel is bad enough now, I don't like the thought of it getting worse

Personally, I'd love to build an E-85 specific carb'd car. If the E-85 was more universally available, I'd be building one for my Monte SS or my 82 Sierra. The mixed fuel they have, is crap ( and usually higher in ethanol than they state), however, if you use a carb built to run the alcohol, you don't have the alcohol related problems. ( but you also need a REAL figure on alcohol content...as in the E-85)
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Re: intakes and TBI's

Postby Gary » August 30th 2010, 11:23am

Good carbs and Bad carbs.........this is a good read and I think this link pretty much sums it up:

http://www.enginebuildermag.com/Article ... carbs.aspx
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Re: intakes and TBI's

Postby bkmorency13 » August 30th 2010, 12:50pm

i notice with my 4.3l astro it runs alot better with 93 that 87. even gets better fuel milage so i think paying that extra 30cents pays off in the end. and i used to get vapor lock with my old 84 camaro with a 305 bored .30 over with edelbrock performer package, cam,intake, and carb 600cfm. this was after racing and then shutting it down. like the saying dont put it away wet. but the carb was easy to tune never had to rebuild it used it for 3 years. i did do some minor modifications to it like removing the choke butterflys. used it on the 305 and a 350 out of a 96 ,maybe earlier no opti-spark, caprice that was tbi. i just replaced he intake manifold with the edelbrock one. ran like a champ. had lots of traction issues. fun fun.

imo go carb, computers just have more parts that break.
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Re: intakes and TBI's

Postby rev_les » August 30th 2010, 8:29pm

Gary wrote:Good carbs and Bad carbs.........this is a good read and I think this link pretty much sums it up:

http://www.enginebuildermag.com/Article ... carbs.aspx

Pretty good link Gary. What he leaves out on the fuel quality part, is that the ethanol also corrodes aluminum,and causes a build up on the needles/jets, and in all the little orifices that most people don't even know exist in their carb.
It's amazing how many people bring their bike in, with it running like crap or not at all, and you tell them it needs the carb cleaned, and they reply, "Oh, no, I've already done that, I pulled it apart and washed it all out with gasoline"....and all you can think, is "YOU IDIOT, Gasoline's what caused the problem in the first place" lol Or they managed to get the jets out, and then reamed them out with a piece of wire to get them clean.... :banghead: (it changes the jet size, for you non-carb guys :D )
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Re: intakes and TBI's

Postby chevy57bert » August 30th 2010, 9:17pm

rev_les wrote: (it changes the jet size, for you non-carb guys :D )


This is complete new for me... :rofl: :rofl:

I know those people. they own a bike , so they know what there doing :banghead: :banghead:
Does Guys keeping the workshop full.. :clap: :clap:
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Re: intakes and TBI's

Postby rev_les » August 30th 2010, 10:26pm

chevy57bert wrote:
rev_les wrote: (it changes the jet size, for you non-carb guys :D )


This is complete new for me... :rofl: :rofl:

I know those people. they own a bike , so they know what there doing :banghead: :banghead:
Does Guys keeping the workshop full.. :clap: :clap:

lol, they make my brother plenty of money, he works on them for a living, and works on them out of his shop on the side, since we live across the street from one another, I get to see plenty of it all the time. :mrgreen:
I don't know if you have ethanol in the gasoline over there Bert, but over here, ( at least around the region I'm in) it's added, and it causes havoc on carburetors, especially if it's something that doesn't get ran every day.
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Re: intakes and TBI's

Postby Zebediah III » August 31st 2010, 3:45am

They claim it doesn't exceed 10% here, but 14-16 is typical! They mix it into the tankers so that they don't get caught doing it at the fuel piers if they get a surprise check...but the killer is that in florida they almost always know when the state is coming.


That stuff is bad on lawnmowers and boats and things with carbs in general, and there is a lot of political push to raise the level of ethanol. We went through this with biodiesel a few years ago and it was horrible for splitting injector rings and stuff like that. Politicians rarely know how a car works, nor do they care.

There would have to be some consistency, honesty and control over quality and we just aren't seeing that.
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Zebediah III
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