[Stuckinda60s]

Originally Posted by guccieng

both my chebby and poncho give exactly the same amount of vacuum from ported and full manifold. that's with an edelbrock afb clone, a holley street avenger, holley hp street, and a cliff's q-jet. absolutely no difference in vacuum after the throttle is touched.

And you know that how? Do you have a vacuum gauge hooked up to both when you're driving? It can't be exactly the same. Virtually or essentially the same, okay. The throttle blades act as a restriction and cause the pressure to remain higher above them. It's the same thing as a water hose and a spigot. And, there's bound to be a difference in how quickly the vacuum in both areas responds to the throttle being opened.

I don't believe there's anyone out there who hasn't seen a difference in some vehicle when one method is chosen over another, so how do you explain that happening? That's why you try it both ways. Every package is different and no one method is going to be the best in all situations.

I used to tune emissions era engines for friends to make them more drivable and help their mileage, and all of those stock engines worked better when using manifold.

I was not saying that Jake should have used fmv, I was only asking if he had tried it after advancing them cam.