Complex sentence: Available only in the 1973 and 1974 Formula Firebird and Firebird Trans AM, the SD-455 consisted of a strengthened cylinder block that included 4 bolt main bearings and additional material in various locations for improved strength.
Split into simpler sentences: Available only in the 1973 and 1974 Formula Firebird and Firebird Trans AM. The SD-455 consisted of a strengthened cylinder block that included 4 bolt main bearings and additional material in various locations for improved strength.