Back then almost all Pontiac blocks (V8) were the same size in appearance The car had sat for 33 years when I found it. My car is actually a 1966 LeMans that was badged as a 326.

I'm guessing your car was built in Pontiac, Michigan. Just search Pontiac engine code identification or something similar. There are various websites that will give you the breakdown that you are looking for. You may have to pull the distributor to read it. The engine identification number is located on the block, on the flat surface in the back of the engine where the distributor is. But although it usually came with four-wheel drive, you could actually order a two-wheel drive Z71.I have a 1967 GTO 400. It became notable enough to be promoted to a package name, even applied as a logo sticker onto the rear quarter body panel. RPO Z71 was an off-road suspension for trucks that is not related to the drivetrain. In the 1980s you could order a Z28 Camaro with a 2.5 liter engine, although this was rare. However most RPO codes that are promoted to model names are appearance packages only, and are not related to speed or engine performance. This happened again with the Corvette Z06 models. The Camaro Z28 name came from an option code which specified a performance-oriented configuration. RPO codes as model names Z71 decals on a Chevy SilveradoĪ few RPO codes have become notable enough that they have been used as model names. RPO Codes and their UPC & Component Groups RPOs codes are assigned to align with specific component groups and with UPC groups as tabulated below: RPOs may be generic options (available on all models over many years), or specific options (available only on specific models for limited years). While fairly complete, it does not contain every RPO that is on the vehicle. In 2018, the RPO Sticker was replaced by a QR code label located on the B-pillar (driver's side, between front and rear doors). NOTE: Reproduction SPID labels may be purchased online from aftermarket vendors. TECH TIP: Take a photo of the Vehicle Identification Number (VIN) and the SPID with you when purchasing auto parts. These codes are sometimes needed during vehicle repairs to select the correct replacement parts. The SPID lists all the RPOs built into that vehicle, in alphabetical order.

RPO decoder (for newer vehicles).īeginning in (yr?), GM attached a Service Parts Identification (SPID) label in its vehicles, most often located on the back of the glovebox door OR in the trunk on the spare tire cover. The records are in GMs' electronic database since at least the 1990 models.

Some dealerships are willing to run a VIN and print out its RPOs (with their definitions) free of charge.

The complete configuration of a GM vehicle (as it exited the factory) can be described by specifying the base model and a complete list of its RPO codes. It was originally all numeric and labeled Sales Codes in 1970 GM switched to the alphanumeric RPO code.Įven base vehicles with few optional features will have multiple RPOs, since both standard components (like engine, transmission, and paint color) and extra cost options are assigned codes. RPO codes designate how a vehicle is built, and they've been used on dealership order forms and in assembly plants since at least the 1950s ( see Corvette C1). ( December 2015) ( Learn how and when to remove this message)Ī Regular Production Option (RPO) is a 3-digit standardized code used by General Motors to designate vehicle options & modifications. Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This article possibly contains original research.

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