Cast vs. Aluminum heads and bang for buck..

The Poncho heads in that SM ad require like $800 headers.

It’s reeeeaaallly easy to put together a 455 Poncho with a mish-mash combo of the wrong stuff and end up with solidly under 350hp.
Built by a local speed shop too.

Okay...... I’ll spill it.
323hp....... after swapping out the supplied 670vs street avenger carb for my dyno mule 850DP.
However....... the carb swap was only worth about 5hp.

The owner had requested a 500hp motor.
The motor was delivered to the shop doing the install with a dyno sheet that said something like 343hp.

They wanted me to re-do it to get 500hp out of it, and I told them I’d have to test it before I took it apart.

317hp as delivered.