The ZL1 badge dates back to the 1960s and the COPO program BUT the Camaro ZL1 that we're a little more familiar with got its rebirth in 2012 with the 5th generation ZL1. This newly minted ZL1 Camaro had a LSA power plant (borrowed from the 2nd gen Cadillac CTS-V) and the 6.2L LSA motor also inherited the CTS-V's 1.9L LSA blower. This combo put the ZL1 at 550+HP from the factory and the gen 5 ZL1 became a fantastic platform for making power. Not to leave well enough alone GM upped the ante with the 6th gen ZL1 given it the Z06/CTS-V power plant of the time - the 6.2L aluminum LT4 with the 1.7L LT4 blower. This ZL1 put down 640+HP and has itself become a very popular platform for making power.