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Chevy Resto Tech - November 2014

Mark Lundquist Oct 15, 2014
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Tip of the Month

What you see in this picture is a close-up of a stock 283 V-8 out of a ’65 Chevelle. It is the original engine for the car being restored. The carb is a 7024110 matching unit for the 283/Powerglide combination. You will notice the picture concentrates on the carb mounting bolts and studs. With the exhaust crossover passage running past the carb intake passage, the rear carb mounting studs have a tendency to corrode and can snap off while removing or installing the carb mounting nuts. This is a common problem with high-mileage engines. Most will have to be carefully drilled out, retapped, and rethreaded. At this point be sure to replace the studs with stainless steel ones. The stainless still can corrode, but in most cases will last much longer.


Send In The Clones

After digging everywhere I know and running all the numbers I turn to you. I recently purchased a 1969 Camaro that is badged as an SS. This leaves me in a quandary. The VIN is N50187109A. The engine is V0820FK built August 20, 1968. The trans is a Powerglide. It has a 10-bolt 3.36 open rear and optional DX1 stripes. Everything I find tells me it could be an SS, and I haven’t found anything that tells me it’s definitely not. Any info would be greatly appreciated as I’d like to know either way. Thanks and keep up the great work.

Rick
Via email

Thanks for the letter, Rick. Sorting out the true body style of the 1969 Camaro can be frustrating. Could it be an SS or not seems to come up all the time. The following is only a guide of what I know with some facts thrown in to boot. The general consensus is all 1969 Camaro SS’s were built with the 350ci engine as a minimum. Other clues that you have a true SS would include factory disc brakes, dual exhaust, and a quick-ratio steering box. Since all of these SS features can be added to turn a standard model into a clone it’s even harder to identify what you have. Without the original buildsheet with the Z-27 option box checked, or the original window sticker, the quest becomes even more difficult. As you have mentioned, the car was built in the Norwood assembly plant and the engine is a 327 with a two-barrel carb with a Powerglide trans. The car was built on August 20. As with the previous model year, the SS option was included in the VIN. Too bad they didn’t continue the process. Many first-generation owners ask the same questions. On the other hand, proving it isn’t an SS without paperwork or documentation can also be hard. Given the configuration of your Camaro, I doubt it is an SS. Even the 327 is impossible to prove it came with the car, as Chevy didn’t include the VIN number in the suffix code until 1972. The good news is you have a 1969 Camaro.


Shifty Business

Thanks, Mark, for all the good information you publish. I hope you can shed some light on the origin of the Muncie four-speed trans in my ’72 LT-1 Corvette. I’m sure it’s an M22, which I understand only came with the ZR-1 model. The numbers on the trans are as follows. I hope you can make some sense why my Corvette has an M22 if that’s what it is. Thanks in advance.

Side Cover Number: 3952648
Main Case Casting Number: 3925661
Number Stamped in case: 155956
Number above 155956: POD 22C

Jim Mack
Via email

Thanks for the info, Jim. You are correct in assuming the M22 trans was only available in 1972 with the ZR-1 option. As you will see from the numbers you sent us, your trans is not original, but it is an M22. The breakdown is as follows:

Side Cover: 3952648 - Short boss bolt with TCS switch accommodation. TCS stands for Timing Control Switch for smog control purposes.
Main Case Number: 3925661 indicates an M22 trans
The numbers 155956 indicate the last six digits of serial number of original car in which it was installed.
Sequence POD 22C indicates the trans was built April 22, 1970.

The trans was built in 1970, too early to be an original unit for the 1972 model even if it had the ZR-1 option. The only clue to the origin of the trans would be the last six digits of the car in which it was originally installed.

The sound you hear reading this is the hoards of Chevy owners running to their 1970 models checking the last six digits of their serial number! Thanks goes to Paul Cangialosi at 5speeds.com for help decoding your gearbox. Paul deals with all types of Muncie trans problems, parts, and upgrades. Contact Paul at 561-743-5600 for parts, questions, or help.


Got a restoration question?
Send it to: [ m ] Super Chevy, Resto Tech, 1733 Alton Parkway, Suite 100, Irvine CA, 92606. [ e ] superchevy@sorc.com [ f ] 949-705-3423

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