View Full Version : 1974 Z28
09-25-2003, 03:56:00 AM
Hey out there. I've been trying to figure out whether or not a 49 state (delivered to NY) '74 Z28 with a turbo 400 would have come with an A.I.R. pump/tubes from the factory? The assembly manual is a little confusing. Also, does anybody have or know somebody that has an unmolested original 49 state '74 Z28 with a turbo 400? I'm trying to get all the details figured out on my car. I would love to see some pictures.
1966 L72/M20 Caprice
1974 Z28/M40 Camaro
09-25-2003, 07:22:00 AM
My '74 Z/28 was delivered new to Mississippi, and it was a T400 with the smog equipment installed from the factory. Hope this helps.
09-25-2003, 08:08:00 AM
Sorry I can't help with this topic- my car is a TH400 but originally a CA car. Does have smog pump. However....
I've been told by several reliable sources that 74 Z's should have deep groove pulleys. Is there any chance that this only applies to non A/C cars? My 74 Z doesn't have 'em, and neither does the parts car I found. Both cars have A/C- one is TH400 and one was a 4-speed. Both cars documented Z's by VIN and cowl tag. Have all the pulleys on both been replaced, or is there a chance that C60 bumped the DG pulleys? Any opinions?
09-25-2003, 09:09:00 AM
I think you are right on target Joey, I had never seen an a/c 74 in the day with them,and I remember in the 80's[early] when the pulleys were available from Gm.there was no 3 groove [lower,crank] made or available.per the books [worked at dealership at time and brought in almost evey listed pulley from flat vette style to little water pump 647 I believe,no 3groove.Its hard to believe these deep groove pulleys were only 15-20 bucks new then seeing what they go for now!! Later Steve!!!
09-25-2003, 10:43:00 AM
My AC '74 Z/28 T-400 car DID HAVE the deep groove pulleys. The car was an original, unmolested car and I am sure they were never added on. I no longer have the car.
09-25-2003, 11:57:00 AM
This is just the kind of input I was hoping for. Keep 'em coming! Hope to hear from someone who currently owns a car with A/C and DG pulleys to get part numbers and such.
09-25-2003, 02:13:00 PM
I forgot to mention that my car doesn't have A/C. Would having A/C require a Z like mine to have an A.I.R. pump?? My Z does have deep groove pulleys everywhere (power steering, alternator, 2-groove crank pulley) although the pulley that drives the fan doesn't appear to be deep groove. Is that right?
vfitom2aol.com-Does your car have A/C?
1966 L72/M20 Caprice
1974 Z28/M40 Camaro
09-25-2003, 02:54:00 PM
Yes, my car had AC as indicated above.
09-25-2003, 09:11:00 PM
how about a 73 with air pump and air cond. this engine is the same as the 74. the air pump was on all z engines from 70 on.. the califorina cars got an on line(assambly line that is) emission inspection that was no charge, but pump and evap canister was standard.73 started the exauast gas recirculator (egr) valve
09-25-2003, 09:32:00 PM
<font face="Arial,Verdana" size="2">Originally posted by mssl72:
Also, does anybody have or know somebody that has an unmolested original 49 state '74 Z28 with a turbo 400? I'm trying to get all the details figured out on my car. I would love to see some pictures.
What details do you want to know about, what parts do you need pictures of? My 74Z28 with TH400 is not completely unmolested, but alot of it was still there and I know what is correct an what is not. I've been collecting data on 74 Camaro's for the last 10 years, I'm just now getting around to building a 1974 Camaro Registry database to catalog it all, I have alot of GM specs/info, GM shop & service manuals,pictures, and any other information I've been able to find on 74 Camaro's. I would like to get more information and pictures of your 1974 Z28.
09-26-2003, 03:26:00 AM
1974Z28- I can give you a run down on my car. When it was delivered in late 1973, it looked just like the Z28 in the "Go Bananas" Camaro ad, light gold metalic w/stripe kit. It has the "Neutral" light saddle interior. I bought the car in 1980. I am the 3rd owner. It was found in a dealers used lot. Believe it or not the previous owner traded it in on a Triumph TR7 (remember, this was 1980). A buddy of mine saw it (he used to own a '73 Z) and told me about it. When I took delivery on it, 8/12/1980, it had 27,554 miles on it. It now has just over 35,000 miles on it. The stripe kit was gone and it had some ET wheels on it, but it was still gold and Z28 emblems had been added to the front fenders and the rear of the spoiler. I tracked down the original owner a few months after getting it to ask him about it. He had some pictures to show me as well. I was able to make copies of a few. They were taken when the car was about 1 month old. He actually had a few things in his garage that belonged to the car, 2 Z wheels and an NOS stripe kit. I immediately made a deal for the parts. The original onwer told me that the car had been in a fight with a guard rail which required the passenger fender an some other parts on the nose to be replaced. He and his father both worked at the Chevy dealership so getting everything correctly replaced was no problem. The second owner was his brother-in-law. He had it a short amount of time (a year or two). I called and talked to him only to find out that he threw out the owners manual, window sticker and other things that the car came with. He said he got them wet washing the car??? I can't figure that one out. When I first worked on my car I went to check the brakes. The fronts looked great. The pads still said "GM" on them. I went to check the rears and there was one weird speed nut on each rear drum. I pulled them off to check the brakes. I threw the speed nuts out. I found out years later what they were for. I had to do a valve job shortly after buying the car for bad guides and seals, it was blowing oil. At that time I did some detail work and added some stupid chrome stuff (now gone). I didn't drive the car much after 1986/87 after the headliner collapsed due to the foam rotting out. I removed the headliner only to find out that the fabric was impossible to find and "August 14, 1973" stamped in ink on the back of the board. I never put it back in because I couldn't find the correct fabric. It just didn't feel right driving it "incomplete". The car still has an original wheel and tire as a spare.
Sorry for rambling, but all this is flooding back. Anyway, one thing I'm trying to find out about is the A.I.R. pump thing. That's why I started this thread. My car doesn't have one and I'm trying to figure out if it had one. That's something I didn't ask the original owner about. It's a 49 state (NY) car, L82, M40, no A/C, power steering and brakes. I need some photos of engine compartments to know the correct routing of hoses and wires, colors, decal placement/part #'s, etc. I have an assembly manual to follow most things, but pictures really help more in some ways. I'll have to post a few pictures soon so you can check it out. I'm more than happy to answer any questions you may have for your data base.
1966 L72/M20 Caprice
1974 Z28/M40 Camaro
09-26-2003, 06:23:00 AM
I have a 74 Z related issue.....Was 74 the year that Chevrolet started the indentation (under the hood) in the right fender. I saw a survivor 74 Z-28 project for sale at this years Super Chevy INDY. That indent was cut out and had a small (bolt/screw) hole on either side of cut out.....I'm asking what kinda of air hook was ever used from fender cutout to aircleaner....?????.....Thanks, Chuck
09-26-2003, 07:56:00 PM
I like hearing the history behind these cars, I bought my first 74 Z28 in June of 1974 and have been in love with them ever since. Documenting a car starts with the vin# and cowl tag, then you look for evidence of things like the Z21 style trim group or Z54 Interior decor and quiet sound package. From there you look at numbers and date marks on the drivetrain. If you really want to get into the details you can even check #'s and dates on almost all componets that are on the car. To decode all of these numbers and date stamps I use a combination of the 1974 MVMA Specifications from Chevrolet Engineering, Factory Assembly manual(2 copies 1 in the house and 1 for the garage), Chevrolet by the numbers from Alan Colvin, and infomation from people I've met on this site. E-mail me and I'll be glad to help decode your car and send what photo's I have. According to the MVMA document all V8 engines except the L22 6cyl. with TH350 received the AIR injection reactor system.
Chuck, I was just looking at the engine compartment of a fairly original 74 I saw at Carlisle, it has the cut out in the fender but no type of ducting run to it, it was a 8/74 build so it was about the last. Niether of the 74 LT's I owned had any ducting except the heat stove to the exhaust. My 74 Z28 that was a 3/74 build date had the dual snorkel air cleaner. All of the 1975 Camaro's I have seen had some type of fresh air ducting from that fender.
09-26-2003, 09:49:00 PM
<font face="Arial,Verdana" size="2">Originally posted by 1974Z28:
Chuck, I was just looking at the engine compartment of a fairly original 74 I saw at Carlisle, it has the cut out in the fender All of the 1975 Camaro's I have seen had some type of fresh air ducting from that fender.</font>
Are "we" saying that the fender cutout started "sometime" during the 74 Model year, but wasnt used for air ducting intil the 75 model???? and then what did it consist of/ look like???.......Chuck
09-27-2003, 02:26:00 AM
My 74Z28 has a TH 400 with AC and it had the air injection setup from the factory. I purchased this Z28 in May 1974 with about 14,000 miles on it. It currently has about 101,000 miles on it now. I took off the air injection system a long time ago, but probably will be putting it back on in the near future. I am not sure what type of pulley mine came on it. I will have look at it tomorrow. My 74Z was originally purchased in NY new and I purchased it in South Carolina. I am the second owner for it. I live in North Pole, AK and a few months ago had my 74 Z28 shipped to me.
09-27-2003, 03:15:00 PM
Check out the engine pic of my early '75 for the air cleaner config.: http://www.geocities.com/pgizz/nonetopass.html
Red '75 LT
"We can make it better than it was before..."
09-27-2003, 03:44:00 PM
Thanks for the eng bay air cleaner pic of 1975 LT....FIRST one that Ive ever seen that showed this.....Say something more as to why fender cutout HOLE started appearing in 1974 but no air ducting until 1975.....and then how many more model years had hole cut out and ducting?????? Thanks, Chuck S / Seattle
09-27-2003, 11:42:00 PM
Either GM started stamping the fenders with the air intake provision late in the 74 model year or we are seeing NOS replacement fenders. If a late build car was being judged I would think that no points would be deducted for fenders no matter which way they were. I can sure with some degree of confidence that GM never used the ducted air cleaner in 1974. Maybe someone else has some more thoughts on this. ChrisS has a tremendous amount of knowledge about these cars maybe this is something he's seen.
09-28-2003, 12:26:00 AM
hen I saw the survivor 74 Z-28 at SuperChevy Indy i didnt write down build date.....but think its interesting that IT HAD the OPEN hole right fender.....not just the indentation but cut out......did all 75 Camaros come with fender cut out and air ducting or did 6 cylinder and 307's not have the ducting....
Chuck Sharin "da judge"
09-28-2003, 12:29:00 AM
I bought a brand new Type LT in '75 with a 350 here on the East Coast and my air cleaner ducting was not like that. Can anyone explain that one?
09-28-2003, 12:49:00 AM
Tom is/was your 75 an lm-1 [4barrel] I also had a 75 with 350 2 barrel in the 80's and it had that same plastic set-up it was a 3 speed manual,a elderly fellow ordered it with the 3speed and a 2.41 or 2.56 rear gear,It was on its 11th clutch at 80 k and the most bluish checked burn't flywheel I've seen in 30 years maybe they used a different set-up on 4bl.I remember the 2v on it had an odd choke,that needed constant adjustment was a good winter car though Later Steve!!!!
09-28-2003, 10:02:00 AM
My first '75 LT was a 4bbl/4 speed, a later '75 build with no fender intake (but from the core support). I think they changed the location in mid-75. I know it was a later '75 build because it didn't have the seat belt interlock which was stopped later in '75.
09-28-2003, 02:22:00 PM
When I bought my '74 LT/Z (M-20 4-speed w/AC) in 1976 the only items that had been changed by the original owner were the mufflers and the removal of the A.I.R. pump/tubes (it definitely had them when new). It also had the deep-groove pulleys. I started looking at any '74 (or 70-73 for that matter) I could from about 1979 whether it was at a show, for sale, or even just on the street with an owner around. Some with very late build dates, but not as late as the one Mark and I looked at this year at Carlisle. About the only thing that I'm sure of, is that I've never looked at what appeared to be very original '74 Z that did not come from the final assembly plant without the A.I.R. This is not to say that it never happened. I know of 2 cases where original owners took delivery of their '74s after the selling dealer removed the A.I.R. system at the buyers request. The fines for being caught doing this are/were quite heavy, but bear in mind this was soon after the emissions legislation was passed, and I don't think enforcement was quite as rigid as it is today. Also, this was at the height of the 1973-74 Arab oil embargo causing a perceived oil/gasoline shortage and in some areas long lines just to buy gas (I'm sure you old-timers remember). The new car dealers had a hard time selling these gas guzzlers and some would do just about anything to move them (including removing an A.I.R. system). The odds of this happening much later than this, would in my opinion, be quite remote.
I don't remember ever having seen a '74 Z with anything but a dual-snorkle air cleaner that I believed to be original for that car. I'd stress that this is NOT the same dual-snorkle part found on earlier Z's. Once again, this is not to say that it never happened, it's just not "Norwood/L.A. typical production".
The issue of the fresh air indents/cutouts on the fenders are something that I just discovered in the mid-90's. My 11B car did not have either. I don't think that I have ever observed a '74 with what I believed to be original panels for that car having it cut out. Even though I wasn't looking specifically for it, the opening would have been quite obvious and noticeable. The fenders with just an indent are another story, I could have very well overlooked it on the later vin's for many years. I think the indent cutout MAY indicate a GM "service replacement" part as the Chevrolet parts book from the late '70s does not list seperate part numbers for a '74 and '75 fender. Another example of this is that the curent mid-year Corvette replacement radiator supports are only available (and have been for many years) as the fuel-injected version with a large cut-out for the frersh air intake in the support and it's very obvious. Fits and works fine, but not original.
GM had typically phased in parts gradually and it didn't always coincide with a model year change. I wouldn't be surprised if they started using the fenders with the indents towards the end of the model year (like the one at Carlisle).
Years ago, I never took much interest in looking at the cars for specific details unless it was at least a 350/4bbl., so some of this may not apply to the low-hp V-8s or 6 cylinders.
Sorry for the rambling here.
Just some thoughts
[This message has been edited by ChrisS (edited September 28, 2003).]
09-28-2003, 06:32:00 PM
I'm the original owner of my 74. The fenders are original, assembly 2wk of June. The passenger fender has the cutout.
Steve. 74 orig owner
383, HD TH350, 3:42 posi, 4wdisc, 12:1 box, IAS, headers, true-dual w/H-pipe. All new susp/bushings.
09-28-2003, 09:33:00 PM
Hey 72zsteve, I had the 350 with 2 barrel and TH350 trans, non posi rear.