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The aluminum heads came on the vette, Camaro and bird. They used iron on the other LT1 cars.
There were differences between years. The castings were different on the 92-93 vettes. They seem to be the better head to port compared to the 94-96. On the Camaro and firebird, it was the 93 model that received the same casting as the 92-93 vette. All were aluminum.
The aluminum heads came on the vette, Camaro and bird. They used iron on the other LT1 cars.
There were differences between years. The castings were different on the 92-93 vettes. They seem to be the better head to port compared to the 94-96. On the Camaro and firebird, it was the 93 model that received the same casting as the 92-93 vette. All were aluminum.