Only the 216 flange pattern is S.A.E. #2: 2-11/16" All 235 & 261flange pattern is S.A.E. #3: 2-15/16"
The 261 carburetor is larger than the 235: Throttle disc 1-11/16" vs. 1-9/16" Venturi 1-15/32" vs. 1-11/32" For best results get the correct carburetor
