Jan. 27, 2021

The NHRA Technical Department recently made changes to the Class Guide.

          Chev Big Block oval port added replacement heads 65-76

65      396/325

66      396/325       396/360       427/390

67      396/325       396/350       427/385       427/390       427/400

68      396/325       396/350       427/385       427/390       427/400

69      396/325       396/350       427/335       427/390       427/400

70      402/330       402/350       454/345       454/360       454/390

71      402/300       454/365

72      402/210       402/240       454/230       454/270

73      454/215       454/245

74      454/235       454/270

75      454/215      

76      454/225