|Casting #s and RPO codes|
Decoding your Camaro’s Numbers for authenticity
|By David C. Atkin|
If you love your Camaro learn the numbers.
1969 Z/28 Decoding The Numbers
I get a lot of people looking for information about their casting numbers and RPO codes at my blogs, so I figured that it was about time that I de-mystified them a bit since I have never written an article dealing with just this issue.
I hope it helps you get your questions answered. If you wonder about your 1969 Z/28 Camaro Decoding The Numbers will give you the answers.
I will discuss casting numbers and RPO codes in this article, and we’ll start with Chevrolet.
A Chevrolet RPO code holds a lot of vital information about your car, and along with your VIN, you should decode your RPO and casting identification also.
They are two totally different things. Your RPO code is located on a machined pad on the engine block, just in front of the passenger’s head, and your casting identification is located at the back of the engine block on the driver side and top the transmission mount.
Your casting number will tell you the engine size, what model of car it was installed in; horsepower ratings, and the transmission that was installed. Some of this is fairly basic, but it does tell you the beginning of the information on your engine.
Let’s take a casting number like 3970010. This engine block when decoded could have come from a few different cars, and you’ll need to compare it to the RPO code to figure out what it is. For this article, we’ll say that it came from a 1969 Z/28 Camaro.
The casting identification indicates that it is a 302 CID engine that’s rated at 290 HP, and it was built in 1969, and it’s a four bolt main block from a late model 1969 Z/28 Camaro, and this is a good starting place. It gives you a good foundation to build on.
|There are a few things that you need to know about the next step, and that step is to decode your RPO code to see if it matches.|
You need to look at the suffix code from the RPO, or the last two or three letters. In this case the last two letters.
If you’re trying to determine if the engine belongs in your 1969 Z/28 Camaro, the last two letters in the RPO code should be DZ.
If they are any other letters, the engine does not belong to your late model (meaning late in the production cycle) 1969 Z/28 Camaro.
The other thing to be aware of is that people who like to scam other people may change the RPO code to make it look like it matches a certain car.
Just pay close attention to the stamping. Make 100% sure that it looks like the factory stamped it.
If there is any doubt, have a machine shop look into it for you.
The other two things that an RPO code will tell you are the date that the engine was manufactured, and the plant that it was manufactured in.
It should match the plant that the car was built in. If it doesn’t, it’s time to be suspicious.
I know that I have concentrated on the Camaro here, but all of Chevrolet’s codes work the same way.
I have used a Camaro as an example because I know the most about Camaros, although the numbers will decode like this on any older Chevrolet.
I have decoded lots of Corvettes also, and they work the same.
All of the Chevrolet products, from 1967 – 1973 use the same system. I haven’t looked at the newer models, so I can’t profess to know about them.
I have done my research on 1967 – 1973 model years.
|David C. Atkin has been in the automotive business for about 35 years and says he has worked in all facets of the industry, from parts to restoration. “I just want to keep people interested in the old cars because it’s where my heart is,” he wrote in his bio. He writes for various old car websites. You can follow his blogs on the internet.|