I've been told by a reliable source that the NHRA blown alcohol motors are shifted around 11,500 RPM
That was several years ago on a BAE #8 billet hemi with their best heads, not sure of the bore and stroke used back then though
10,500-11,500 depending on some of the other factors ,
typically BXS is either 4.187/4.20 the 420 bore puts you @ 498 CI .., with the 4.50 crank , the 4.625 crank guys use 4.125 bore , which is right around 495CI also , sleeves for the 4.125 bore are special order had to come by.
90% of these TF guys are running the 4.187X4.5 combo.
My TFX hemi for my 66 dart project is a 4.187 bore with a Bryant 4.625 ,509 CI with AJPE 426 Stage7 heads, with a F 3D-106 Procharger.
