I know this has been covered many times, sorry if this is a repeat, thought some of you might be interested and maybe someone can clear this up for me. Went to the local GM counter today to order pulley, this part number is listed as an export only pulley for impala LT1 cars, probably for cars destined for shipment out of the country that don't require smog. Problem is, it's now discontinued, he is now currently doing a search for me around the country to try and find one sitting on a shelf somewhere. I came home and got on GM Parts Direct and typed in the number. They list it as available although they have it described as a water pump pulley and there is no picture of it to confirm this is what I am looking for. Also there price is way cheaper, Parts direct lists this for $38 and my local GM dealer has it listed for $50 my cost. Could someone clear this up for me? Has anyone purchased this smog delete pulley from GM Parts Direct lately? Thanks for any insight on this, Larry.

My delete pulley has part # 10129569

Really? Tell me more, I got my part number right off of this site in the smog pump delete sticky. So now there is a different number? What kind of car do you have this working on? This is the pulley assembly that bolts in place of the smog pump and acts as an idler for the belt,,,,,,correct? Larry.

Called my GM parts guy and had him run that number, it comes up as 91-93 pickup truck bracket and pulley, but shows it for the big block trucks. I assume this will also fit an 88 350? He had a picture of this one and although it was just listed as a bracket it had a pulley mounted on it in the picture. This was $40 my cost, still cheaper than the first part number I had, so what is going on here. I am a little confused, I have it coming anyway, Any input is appreciated, Larry.

There are in fact two options:

A delete pulley that just touches the belt (you need a shorter belt) part # 10129569

A second delete puley where the belt goes around ( no need for another belt ).

I.m.o. you don't need a pulley at all, just the right size belt will do!
(and that's option # 3!!)

Ya I see the difference now, the first part # I have uses the stock belt and the pulley you use just barely touches the belt. If that is the case does the pulley you have do anything beneficial? Could you please give me the part number to the belt you are running? I hate to make 10 trips to the parts store until I find one that will work.
I have a belt number for no pulley at all (Dayco 968K6) and although many people on here use this method, I was a little skeptical about belt movement when the A/C is turned on and I thought the idler pulley would make for a cleaner looking install.
How much does your pulley actually contact the belt? Thanks, Larry.

Since i live in Europe, we use centimetres, and no inches, so it's no use to give you the demensions of my belt.
When removing the smogpump, you'll need a shorter one, that's for sure, I tried several, before I found the right size, luckely I could return them to my parts supplier, just be careful not to make them dirty, and keep the original packing.
I haven't installed the pulley right now, it's stil in the original box.
I doubt I will ever do, the belt and everything is working alright now!

I appreciate the replies and information, I have the pulley you mentioned on order since the number I got from this site seems to be not available anymore. Looks like I will run the pulley you mentioned and then play with belt sizes. Thanks again, Larry.

Just received my 10186167 pulley from GMPARTSDIRECT for 47.00 including shipping....however local dealer could have ordered but cost more. I would use this pulley as the belt wraps around it just like the pulley on the smog pump and basically looks like it belongs there........without it the belt has a very long run and can

"flop" around especially when a/c is engaged. As opposed to the other pulley your post mentions this 10186167 uses the original size belt and IF you want to go with underdrive pulleys at a later date you simply use the one the pulley manufacturer suggests, no measuring or wasted trips to the parts store.

The most importand thing to me is it looks right and you can't see the bracket support assembly where the pump was which makes it look like something is missing.

Question for anyone who has removed the air/smog pump......did you trace the wiring harness from the two connectors if so where exactly do they go because in my opinion it ALL needs to go if the pump is removed ?????????


Bill E.

The belt doesn't "flop" even with the a/c on, if the tensioner is allright....
The pulley is only cosmetical!
I tied the two wires together and hide them behind the a/c.

Bill, my dealer came through for me and was able to get the pulley you mentioned. It should go on with the original belt although I have not installed it yet to find out.
The dealer had to go through a little trouble to get it, since this is listed as an export pulley only, the dealer was questioned as to what where and why when it was ordered but was able to get it anyway. This is what I wanted originally so I can use the stock size belt and make everything look as if the factory intened it that way. I am a little picky like that I guess.
Thanks again for all your help guys, now I just have to find the time to remove the smog pump stuff and install this pulley.
Larry.

Bill, just a side note I forgot to mention. I was comparing this pulley to the smog pump and noticed the pulley diameter on the new pulley is smaller than the pulley on the smog pump. Not much though, about an inch difference, I am assuming the new pulley will mount in a slightly different position to take up the slack this smaller pulley will create therefore allowing me to use the factory size belt? Just curious as I have not had a chance to install it yet but if this pulley is centered exactly where the smog pump is then a shorter belt will be required due to the smaller pulley size. If the new pulley is offset slightly from the smog pump location it could or may take up the slack caused from the smaller pulley. Sorry if that sounds confusing, just something I noticed but have not yet confirmed until I actually install it. Maybe you could clear that up for me, Thanks again, Larry.

Larry,

Use your factory belt size and it will be a perfect fit. Many here have done so and so have I. I never noticed a difference in pulley sizes, if it was different it must be as you said it was offset because it was a perfect fit. Looks factory and looks like nothing is missing. Contrary to what some might say there have been issues without running the delete pulley with the belt flopping so much some were concerned it would come off during a hard higher
rpm jaunt, so why chance it,do it right, no worries.
Bill E.

Thanks Bill, as soon as I get a free weekend I will tackle it.
I am like you, I just didn't like the idea of not having something to support the belt even though there are many on here who do not have a problem, I like a clean looking job and I am picky with how things look on my cars so I thought this pulley would give it the appearance of a factory install. I am just weird that way. Thanks again, Larry.

Larry,

If you're weird that way then a lot of us are. Whenever working on my Firebirds not only do I keep performance in mind but also appearance which is a large part of the reason to get rid of the air pump in the first place.

Did somebody here, without a delete pulley, ACTUALY had the belt run of at higher rpm's? (any rpm's?)
I don't believe it will, as long you use the right size belt, and the tensioner is ok.
I drive my V-8 for some time now without the smogpump, without any delete pulley, with the A/C on all the time, and I have driven it hard......
No problems at all......!!!

Do a search, many have had concerns about this, but honestly why keep coming back for more. The guy wants it to look factory and like nothing is missing, your way simply will not accomplish this.

I know, but that's not my question!
Many may have concerns, but how many belts really came of, that's what I'm wondering, looking stock or not......
I can search forever, but didn't find anything.....

Well, there's another fact about removing the smogpump, it will cause the engine to run a little leaner.
Ask Vader, he can explain better than myself!

(BTW, the pulley I mentioned earlier does make "looks" original as well.....)

You were telling him to not run a pulley, ok now you are ...I am lost.

Air pump pumps air into the exhaust manifolds and the convertor for cleaner emissions and thats all it does. Won't lean out a thing.
Air pump is after the combustion process has been completed.

As far as Vader goes he is very knowledgable however he will also tell you it is a good thing to run hot dirty exhaust gases into your engine by way of your egr and tell you your engine will run cooler for doing so. Cooler denser air makes more power and your engine will run cooler this way as opposed to letting the hot exhaust gases enter into the picture.

I don't believe you have read my earlier posts above......
And still no answer to my question...but never mind, no belt has ever come of without a pulley I'm sure!

Wow guys, this has become a touchy subject, sorry if I have started an arguement here. My intention was to just let everyone know that the part # for the pulley that I got off of this site was tough to get through the dealer. But I was able to get it finally. The other number that was given to me from a post on this subject (sorry can't remember your name) is also available but is designed a little differently, the pulley is smooth with no grooves and I believe is designed to ride on the back side of the belt. But I thank you for the part number, I do appreciate all the info on this board. I had ordered both numbers and had them side by side at the dealer and chose the pulley I originally ordered (ie the number this post was started with) as it has a pulley with grooves and should install and ride just like the smog pump pulley.
As far as the running lean condition, I originally did a search on here and read for hours about it and did find where Vader mentioned about the lean condition, it seemed minor to me and I read where most people have removed the pump and never addressed the condition and have had no problems. I do plan on burning my own chips in the future and as I learn more I will try to address this. I may remove the converter first and drive the car a little while and make sure there are no codes or something silly like that, then remove the smog pump and see what happens from there. I do plan on also installing an adjustable fuel pressure regulator and run slightly higher pressure to compensate for a lean condition somewhat, I know this is somewhat of a bandaid, I know the best way is to burn a new chip but I am hoping this will be fine for a while until I learn more about burning chips, but this is another subject by itself.
As far as the belt flying off, I have not found anywhere in my searching where this has been a problem, I just like the idea of having the pulley there, looks clean and factory, and I can keep the stock size belt on the car which will make future belt changes easier for me if I can't recall the number and the parts store has to look it up by application, so that was also a small concern for me. Sorry if this post has caused problems. I just like to research things thoroughly before I do anything. Thanks again guys for all the help, it is really appreciated, Larry.

You picked the correct pulley and there have been posts of people concerned about there belt coming off without the pulley which is my point, why take the chance when with the pulley it will NEVER be a concern and it will look factory correct.

There is no way removing the air pump could lean out the mixture.
Even it somehow it was pumping air into the mix if you removed the air you would be rich not lean. It only pumps air into the exhaust manifolds and the convertor, look for yourself and you will see what I mean.

Cool, thanks a bunch Jetmeck. I think I got your name right. Sorry if I didn't. Thanks again, Larry.

There has been some discussion on this before on the DIY Prom board if I remember correctly. Removing your air pump does alter your fuel mix because the ecm offsets the O2 voltage by .100 mV under certain cicumstances. Granted its not, a huge or even noticeable difference, but does have an effect atleast in theory.

Not sure how to comment on that but I did finally remove the smog pump and installed the pulley, right after that I drove the car and filled up the gas tank. Previously I have been getting 18-18.5 mpg pretty regular just driving in stop and go traffic, I have not had the car on long extended highway trips yet.
Now that the smog pump is removed I just got 19.7 mpg with same driving habbits and driving on the same country roads around here. Not sure what that says but something has definately changed, no ill affects that I can tell, car still runs fine and has plenty of power, uh well I guess as good as can be expected for a stock L98 so far I am happy, now I just have to burn a chip, adjustable fuel pressure regulator, yada yada yada, Larry.

You don't need a delete pulley to remove the smog pump. See:

http://www.thirdgen.org/newdesign/tech/serpentine.shtml

Thanks, I was aware of that, I just liked the look of the pulley being there, and I can still use the factory length belt which I also liked. I am a little strange that way I guess. Larry.

Just in case ya'll missed it:

http://www.thirdgen.org/techbb2/show...readid=251909;)

sorry for reviving an old thread... but for those people afraid of the belt coming off:

someone i know has a 91 silverado /w a 350SBC. it has no smog pump from the factory, and has no delete pulley... just the open bracket mounts as if we deleted our pulleys. the rest of the accessories look to be in the same location as my 88 TA, so out of curiosity, i pulled up the belt part number for that truck from napaonline.com and it listed the SAME part number as cross refrencing that Dayco 968K6. this increases my confidence in just removing the pump and getting a new belt.

interestingly enough though, the NAPA part number lists it as a 97.175" 6-rib belt and NOT a 96.8" 6-rib belt that the article on this board refrences (http://www.thirdgen.org/newdesign/tech/serpentine.shtml)

I Used a belt from a 1989 v6 Camaro for my smog delete. Its 96.7" long, and works great! In fact, for a little while, I used an old belt from a 1998 Suburban that I had lying around. I didnt use it for long cause I was scared to, but it worked great while I had it!

I have a 91 RS with a 305 what size belt would you recommend? I can just remove the pulley correct. Everthing else is gone and I have no cat.

Nevermind i found it. 967K6 at Autozone. Works perfect.