E-street vs Promaxx vs 440 Source
They will be down a bunch of cfm to the Ede heads.
Very nicely ported big valve 452’s are barely equal to ootb E streets.
I have yet to see any “home ported” factory std port BBM head flow that much.
This is like what you need to equal an ootb Ede head:
If someone thinks they can spend a few hours grinding on factory heads and end up with heads that are “just as good”, is someone lying to themselves.
They will be down a bunch of cfm to the Ede heads.
Very nicely ported big valve 452’s are barely equal to ootb E streets.
I have yet to see any “home ported” factory std port BBM head flow that much.
This is like what you need to equal an ootb Ede head:
If someone thinks they can spend a few hours grinding on factory heads and end up with heads that are “just as good”, is someone lying to themselves.
