GM RPO build codes
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| Line 709: | Line 709: | ||
Stamped on the engine pad located in front of the right head. An engine identifier is also stamped here. | Stamped on the engine pad located in front of the right head. An engine identifier is also stamped here. | ||
| − | + | ==Heads== | |
The casting number is usually in the area under the rocker arms. Years of baked oil may fill the numbers to make them hard to read. On some heads, partial numbers were found on the intake runners on the block side, such as the 461 and 462 heads. | The casting number is usually in the area under the rocker arms. Years of baked oil may fill the numbers to make them hard to read. On some heads, partial numbers were found on the intake runners on the block side, such as the 461 and 462 heads. | ||
| Line 720: | Line 720: | ||
Stamped on a metal tag on the left front of the plenum. Serial number Stamped on side of plenum for the first hundred or so in 1957 and then were stamped on the metal tag. The serial number does not have to correspond to the car's serial number. | Stamped on a metal tag on the left front of the plenum. Serial number Stamped on side of plenum for the first hundred or so in 1957 and then were stamped on the metal tag. The serial number does not have to correspond to the car's serial number. | ||
| − | + | ==Intake Manifold== | |
The small block usually has the date on the driver's side rear runner. The date is typically below the casting part number. The firing order (18436572) is usually cast on the front runner so do not confuse it with the part number. Some big block intakes have the date cast under the intake so that you must have the intake off the engine to see it. | The small block usually has the date on the driver's side rear runner. The date is typically below the casting part number. The firing order (18436572) is usually cast on the front runner so do not confuse it with the part number. Some big block intakes have the date cast under the intake so that you must have the intake off the engine to see it. | ||
| Line 732: | Line 732: | ||
Stamped on top with date and amperage rating. Date Code Stamped on top along with amperage rating and part number. | Stamped on top with date and amperage rating. Date Code Stamped on top along with amperage rating and part number. | ||
| − | + | ==Exhaust Manifold== | |
Usually on the outside of the manifold. Small block Ram Horn manifolds usually have this on your left as you view them. The big block manifolds are down the side. | Usually on the outside of the manifold. Small block Ram Horn manifolds usually have this on your left as you view them. The big block manifolds are down the side. | ||
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