Intakes were always 2.08 on all 915s. The difference was the exh valve. That was either 1.74 if they were supposed to be on a 440HP, or 1.65(IIRC) if they were supposed to be on non-HP 440s. I say "supposed to" because until you pull them off and look, you never know for sure what you have. Those look like the smaller exh valve.
