13B turbo build

into my first rotary build and gathering information

the porting is a bit weird to me as no one speaks of degrees like you would choose your cam setup.

the build would be around 350-400 flywheel horsepower. what ports would be ideal ? as i know its fairly easy to go overkill on cams too

Probably safest to buy templates from a reliable source like xtreme rotary. Less is often more if you aren't changing gearset/final drive/monster turbo/inlet manifold.

These days with turbos being what they are and the ability to break 375+ on stock ports I ask people where they want their power band rather than how much power they want to make when building them an engine.

Want your torque peak around 3.5k(+/- a fair amount depending on generation of block)? Stay with stock ports and add more boost, want to keep it relatively similar but keep pulling? Extend the closing edge as well as open the throats of the intakes a bit, and widen the exhaust ports. Want torque to peak at ~7k? Increase both opening and closing of the intake as well as close the exhaust later when working them.

After that you'd be going with bridges (not what I'd suggest, but there are those that love them) and either full periphs (aspirated) or semi-periphs (boosted).

I suppose what I'm saying is that there's a whole lot more to it than just 'I want X power level', it's as much or more how you want the car to drive AT that power level.

Edit: Also Xtreme Rotaries port templates look surprisingly similar to what I've helped developed with the folks that taught me to build as well as what people have asked me to experiment with - to that end I'd also say they'd be my go to port template provider if I didn't have my own.