The 429 CJ/SCJ Paper Engine Tag

Did the 71 429 Mustang come with a paper engine tag on the front valve cover like the '71 Boss 351 above? The answer is yes! The photos below confirm this and show the tag was located on the front surface of the 429 CJ/SCJ passenger side valve cover.

Unfortunately, all the details on this tag are not visible in the photos above. However, based on information from other '71 tags and information from a 429 Group survey, we have taken a stab a constructing what the '71 429 Mustang tag probably looked like below; 

So How Did We Come Up With This? Here's Our Logic;

First of all, the alpha-numeric code on this tag is the same code as the one shown on the metal Engine ID tag under the coil bracket and the Engine Tag Number from the top left corner of the buildsheet . If you look at this engine code chart from the MPC , you will see the code for a 429 CJ/SCJ will be a three digit number ranging from 824 to 838 with the precise code depending on CJ , SCJ, vehicle type and transmission type. Based on a survey taken of our group, we have found the following codes apply to the 71 429 Mustang and Cougar;

 

71 429 Mustang/Cougar Paper Engine Application Chart
Paper Tag Code	CJ or SCJ	C6 or 4 speed	Vehicle Type
K833-K	429 CJ	C6	71 Mustang/Cougar
K833-KG	429 CJ	C6	71 Mustang/Cougar
K834-K	429 CJ	4 speed	71 Mustang/Cougar
837-J	429 SCJ	C6	71 Mustang
838-J	429SCJ	4 speed	71 Mustang

So we now know which Paper Tag Code goes with which 429 Mustang/Cougar application. What about the number in the lower left corner of the tag? This is the ignition timing for the engine and is 10 degrees for both the 429 CJ and SCJ engine. Regarding the "L" in the upper left hand corner - it is not known what this meant but we are assuming it is the same for the 429 tag since "L" is used for all other period Ford engine stickers.

If you would like to have one of these stickers for your 71 429 Mustang or Cougar, click on the Engine Tag Template link below and follow the instructions!

Make Your Own Paper Engine Tag Instructions

                                                    
1. Click the following link to open the Microsoft Word file: EngineLabelsMasterSheet.doc

Note: The template below may take up to 1 minute to open on some computers.

2. Save it to Microsoft Word.
3. Print this Microsoft Word template out on a sheet of #8161 1"x4" white address labels available at your local office supply store. 
4. Select the appropriate tag off the sheet for your application based on the Application Chart above. 
5. Trim the rounded corners off each end of the tag to make it rectangular.
6. Use solvent to clean and degrease the front surface of your valve cover. Stick the tag on the front surface of the passenger side valve cover (in the same location as shown in the photos above of the original 429 stickers). 
7. Obtain a transparent sticker (I used shipping tape) and cut a rectangle that overlaps the perimeter of the paper sticker by about 1/8". Overlay the clear sticker over the paper engine tag to protect it and produce a shiny covering like that used on the original Paper Engine Tag.

MPC Data

Poll Data From 429 Mustang/Cougar/Torino/Cyclone Owners