Building the FR-S FA20 engine with Stay Crushing, Building the Cylinder Heads With Portflow Design


Our finished ports look great and will give awesome low lift flow, especially when paired with our contoured Supertech valves.
Another look at the area under the valves. Smooth unobstructed flow at low lift. Our heads will have quite a bit more flow with no loss in velocity at low RPM that can hurt low-end power and response in the way that large ports can.

Now that our heads are done, in the next installment of the Stay Crushing engine build, we will start assembling our supercharged engine in anticipation of more boost!  Stay tuned.

Read Part one of our FA20 Engine Build!


Portflow Design

JE Pistons

Brian Crower



King Bearings



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