If you love your Camaro learn the numbers.
1969 Z/28 Decoding The Numbers
Therefore I figured that it was about time that I de-mystified them.
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.
Therefore 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.
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.
Your casting identification is located at the back of the engine block on the driver side on top of the transmission mount.
Your casting number will tell you the engine size, what model of car it was installed in the 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.
Therefore you’ll need to compare it to the RPO code to figure out what it means.
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 H.P.
It was built in 1969, and it’s a four-bolt main block from a late model 1969 Z/28 Camaro, 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.
That step is to decode your RPO code to see if it matches.
Therefore 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 for a 302.
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.
Therefore 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.