12:05 Garage- ’70 Duster build

DionR said
SRV is just an RPM switched output, not sure if it is power or ground though. The OEM setup has a sense to verify open/close (I think), but not sure that is necessary. There is a power and ground as well, but those are separate from the PCM. The OEM setup activates at 4800rpm, not sure a dyno is really needed. Engine Masters did a show on the Eagle 5.7 and messed with tuning the rpm where it flipped and pretty sure it ended up being the same rpm as factory.

VVT just needs a PWM output, and supporting code. Best I can tell, version 1.3.0 from '14 was when support for VVT was added. And the solenoid is just 2 wires, power and ground.

So (in theory), only 2 pins needed to add both.

I would guess that a 6.1 intake gives up a little to the 6.4/SRV intake on the bottom end but pulls the same at the top. And I am doubting you will want more on the bottom end. So, I doubt you will ever want either VVT or SRV. Add that most aftermarket cams lock out VVT anyways so even if you did go to an Eagle later, there is a good chance VVT wouldn't be on the table anyways.

Plus SRV would require you to cut your firewall to fit it. You could run a 6.4 truck intake which has the SRV solenoid on the front, but the intake points up about 45 degrees to the passenger side so it would be kind of a weird setup in a car.

Either way, it was more a joke. My mind always goes to the "what-if", so I instantly got curious if there was room to expand. Not suggesting you actually need to add either one.

I'd image the RPM would change on the SRV based on the camshaft. But you're right, I really don't have a desire to have that functionality on this car. If I was building a cruiser with a basically stock motor, most definitely.
The voice in my head is already thinking of an upgrade to this motor and it isn't even in the car yet! Since I intend to put a Torqstorm on this thing, I'm not sure a larger displacement motor is even necessary. Given the cost of an eagle 5.7 vs. a 6.4, the eagle 5.7 is the way to go. For the same money, I think you can do an early 5.7 (super cheap), eagle heads and forged rotating assembly vs. a stock 6.4. Sure you give up having the Apache heads, but does it really matter? A ported set of eagles can flow around 340-350cfm. The stock Apache's are likely close that and can obviously be improved. I'm not searching for tenths in the quarter mile, so these things are irrelevant to me now. The supercharger should easily make 550-600whp, which will be a ton of fun.