12:05 Garage- ’70 Duster build

racerjoe said
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.

Completely agree. I like the idea of a 6.4, but I think a 5.7 can do the job just as well, unless you are looking for the last couple of 10ths. And I like smaller V8's anyways.

Personally, I think the only real drawback to a 5.7 of any vintage is the cam. They are effectively a truck engine and stop pulling at 5200 rpm or so. My '15 R/T was a blast around town, but on the highway it felt strangled when I needed to pass and just wasn't as fun at the higher rpm's. The cam is too small, much like the 5.9's. So a 5.7 with a 6.1 or 6.4 cam and a better intake and exhaust if possible and I bet it would be hard to tell what's missing compared to a stock 6.4. There are probably better cams, but I like the OEM ones because they are cheap (or used to be) and the 6.4 cam keeps the VVT functionality.

My dream build is probably a forged Eagle 5.7 with AFR 212 heads (assuming they fit a 5.7 bore). Initial build would be with an 6.2 cam and later a HC blower since the AFR heads are dual drilled. No idea what kind of power it would make, but I bet it would be enough for me.

I like the idea of VVT and SRV as it makes the motor a little more of a "best of both worlds". But with a lighter car, maybe the "best of both..." ends up being too much on one end. :D