Someone will have something on the dyno that makes 600hp with those heads........ then the “panic” will subside.
I actually got a little chuckle about hearing how there were conversations with TF about what might be “wrong” with the heads.
As I said already, there are several TF headed mild BB builds on Grays Facebook page that make basically the same HP/CI as the 408 did...... and no one is giving it a second thought.
Why? Because there have already been plenty of builds where the motors made way better power using the same heads.
The panic generated from this build will disappear once a more suitable build is tested with them.
From Grays:
408 - 1.075hp/ci
505 - 1.089hp/ci
508 - 1.045hp/ci
Keep in mind...... those BB builds were done well after they had already used the TF heads to make over 1.50hp/ci.
Which just highlights the fact that no one single part is going to transform a mild combo into a fire breather....... other than maybe a nitrous kit.