A few of my buddies and I recently completed the build of a 1969 Barracuda convertible for my buddies wife after my buddies untimely death. My buddy bought a Magnum crate 360 engine for the car. After installing it and getting it started we noticed very little braking. Further investigation turned up the fact the engine created very little vacuum at low rpm. After installing a power break booster pump with little changes to the braking, we are now thinking about changing the cam. The current cam in the crate engine has the follow characteristics:
Intake valve diameter: 1.925
Exhaust valve diameter: 1.625
Intake lift: .501
Exhaust lift: .513
Intake duration: 288 deg
Exhaust duration: 292 deg
Also the current cam had a 108 center line bore.
Lastly, the crate engine came with a M-1 Single Plane manifold. After talking to the tech people at Magnum Performance, they told me that us set up to be run on a track and not on the street. They told me to change out the manifold to something like an Edelbrock dual plane RPM manifold and to a more mild cam like the Magnum Performance P5155563 cam.
My buddies wife who owns the car will only drive the car on nice spring/summer days around town. It will very rarely get on the freeway.
What are people's thoughts? Keep the existing cam & manifold or tone things down with a more mild cam and better performing manifold combo.
The carb us a Holley 750.
