1999 Pontiac Firebird engine rebuild kit

Is there a complete engine rebuild kit for ls1 trans am

Yes, but you might want to compare rebuild cost to purchase a brand new long block from GM

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Agree with the new long block thought. There are also rebuilders that will sell a reconditioned long block. There are suppliers that will sell you a new or rebuilt 6.2 liter you can slip into that '99 TA.