Identify the engine block in your car. Usually two or three letters, stamped on machined pad in the front or back of your engine block. If the decoder doesn’t locate your rpo code, send it to webmaster@muscle-car-resto.com and I’ll locate the code and add it in. Remember if it doesn’t locate your code, it may also be that you don’t have the correct engine in your car.

If the year of your car doesn’t locate the info that your looking for, locate the year of the engine from the rpo code and use that, before you send in your info and ask me to locate your number.

Allow me to explain how the RPO decoder works, lets say that you had a 1969 Z/28 Camaro, with a small block that you were planning on buying, and the owner had represented it as a factory stock 1969 Z/28 with a DZ 302 in it, in front of the motor head on the right side of the block in a machined pad with some numbers, this is your RPO code, at the end of the code should be two or three letters, also known as the suffix of the RPO code, in the top blank of this decoder you’d put the year of the car, which in this case would be 1969, and in the bottom blank would go the suffix code, or in this case DZ which would indicate a 290 hp 302 from a 1969 Z/28 Camaro. We’ve just added all the block suffix codes for the 1967 Big Block Corvettes.

The decoder has been updated, we have added 1968 Corvette codes to our data base, and you no longer have to accompany your rpo code with the year of car, just simply type in the two or three letter rpo code, and if our database has the code, it will decode it for you.

GM, Dodge, Chrysler, and Plymouth. Engine RPO code.