[Rev]

I'm looking at the chart that came on the box that my TFTW heads came in.

.1 intake lift.............. 63 cfm, Exhaust lift...........53 cfm
.2 ......................... 141 cfm, ........................107 cfm
.3 ......................... 205 cfm, ........................144 cfm
.4 ......................... 233 cfm, ........................171 cfm
.5 ......................... 251 cfm, ........................187 cfm
.6 ......................... 251 cfm, ....................... 193 cfm

Looks like your Canfields beat the TFTW's all to heck flow-wise. With that big of runners (192 vs. 170), be sure that you don't have too much head for your application with those Canfields.

Rev