Aren't all vortec 96- 99 350 engines roller cam? I just bought a truck that suposedly has a vortec short block in it from a 98 suburban. I am hoping it has roller setup in it. I want to just put vortec heads on and a 650 Holley carb and I am hoping for a decent thing here.
The differences in a vortec motor are all in the top end. Mainly the heads. The intake and valve covers are special but just to work with the heads. The reason that the vortec motors run so well is that the heads have a slightly raised intake runner. This produces much better flow and velocity.
Fuel injection is not superior when it comes to horsepower! When it comes to drivability it is. That poppit valve port fuel system on those vortecs is cheesy design GM took an already crappy desighn and added to it.