1964 nhra drag racing class

[georgep3689]

SO a little help...
Is there a difference between...
S/S class (S/SA is automatic)?
SS/A class (SS/AA is automatic)?

FOR Drag racing in 1964....
Thanks

 

[fwi]

I don't think it refers to automatic but rather to a classification based on weight/cubic inch ratios.
http://www.gassermadness.us/Gas_Classes/index.htm