April 23, 2021

The NHRA Technical Department recently made changes to the blueprint specifications.

                    Chev 16-18 350/580 added alternate head 19419191

                    Chev 16-18 350/590 added alternate head 19419191

                    Chev 19-20 350/600 added alternate head 19419191

                    Chev 19-20 350/630 added alternate head 19419191

                    Chev 16-17 409/450 added alternate head 19419191