word of warning,
port injection is pretty complex due to the siamese ports in the mini head, due to this the mixture gets skewed between inner and outer cylinders, i seem to remember seeing figures of 1-1.5 AFR difference, which is pretty big especially on a turboed motor.
IIRC on turbomini's they were using a pair of lambda sensors ( one for inner cylinders one for outer) sampling pre turbo ( meaning you need a bunch of extra pipework so the sensor dosent see exhaust pressure) then injector timing was being mapped though out the rev range to counter the skewed AFR's
It all sounded a PITA to me so i used a 7 port head to get around the issue.
I wondered if that may be the case, I didn't know if I managed to get the injectors far enough away from the head that it may negate the effects of the siamese ports. Ie: injecting fuel at the bulkhead end of the intake manifold so there is 6" or so of port before they split to the inner and outer cylinders.
It's all down to limited space I guess and managing to fit the injectors in around the supercharger, it may be more effort than it's worth..
Of course like you say a 7 port head solves the issues, but they aren't cheap!
Edited by RooBoonix, 20 November 2020 - 09:03 AM.