The NHRA Technical Department recently made changes to the Class Guide, due to clerical errors as follows.
1975 Chev Chevelle 400 175/240 change to 400 175/275 Stock
1975 Chev Chevelle 400 175/245 change to 400 175/290 SS
1969 Chev Camaro 427 430/470 change to 427 430/476 SS