TF & Speedmaster Flow Tests

A couple of random thoughts……
- lowering the seat .090” takes away what I feel is valuable length on the floor from the apex to the seat
-I don’t feel you can actually fix the SSR by playing with the seat angles.
The seat angles are more about pressure recovery as the air moves thru/past the seat.
-the tulip valve reduces the port area around the whole valve.
While it’s blocking air moving over the SSR, it’s also blocking the air at other locations in the port.
That air is trying to find somewhere else to go……which then taxes the SSR again.

I’d try a “normal” valve seat profile on a different port, nothing else, while sinking the valve the least amount possible, and ending up with a 30* top cut that’s around .040” wide.
No chamber mods.
Flow that, then start addressing the SSR……..and see where that ends up.

-FWIW, I’ve never tested any ported SBM std port head that didn’t have some turbulence issues at higher lifts.
-While I’m comfortable working on them, I also don’t consider myself as someone who has them “all figured out”.