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The only comercially available porting templates are from Racing Beat...they are conservative ports...but there isn't a ton of room for much more there
There are 3 intake valves...the SSV and VDI are easy to actuate.....they have electrical solenoids for triggers and use vacuum actuators to open and close
The APV is a bit more difficult..but I believe a lot of newer ECU's like Haltech etc can actuate them. They use a reversing +5V signal to open and close the motorized valve
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