Here’s my take on the perception of the TF heads, compared to the RPM’s.......
Unfortunately, the SB TF head didn’t get to be highlighted in the public eye on the same type of build the BB TF heads were used on with the 470 motor that Andy F built that got all the attention right at the beginning.
That was essentially a pump gas bracket race build with a solid roller cam.
The only builds I’ve seen in the pubic eye so far with the SB heads have been street friendly builds with hyd roller cams.
Shortly after Andy had already done a round or two of testing with the TF BB heads, making great power....... Steve Dulcich did an article with them using a basic street 440 short block(2355 pistons, etc), under .600 lift, fairly short duration solid roller cam........ and the numbers were, well...... imo, somewhat underwhelming.
Had that been the first test everyone had seen....... they wouldn’t have been as instantly touted as “the” street/strip head for the BB Mopar.
I’ve dynoed a fairly basic bracket race SB build years ago with 280cfm RPM heads that made 585hp....... it the TF heads flowed closer to 300cfm, I can’t see how 600hp wouldn’t be within reach.
Hell, Brett Miller made close to 800hp recently with Indybrocks.
That would have been considered impossible not too long ago.