Engineered to fit all GM LSx engines - Compact design allows for easy storage for any LS engine -Fits All LS series engines such as LS1, LS2, LS3, LS7, LS9, LM4, LM7, LQ4, and LQ9. Not compatible with 1955-1957 265 and 283 SBC engines since those engines do not have side engine mounts.