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Original Message
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| RE: I am doing the unthinkable |
| By Gerry Proctor - 03/13/2002 3:40:11 PM; IP 207.133.188.254 |
You want to pay particular attention to the lobe separation angle when selecting a cam, James. Nothing against Comp Cams (I've even use one...once) but they tend to run tight lobe centers -110 degrees seems to be their favorite number. This gives the cam that nice lope and a strong mid-range but completely screws up the idle and idle vacuum.
You may want to look at cams that have LSAs in the 112 to 114 degree range. These will give you a relatively smooth idle with good idle vacuum. They have a softer mid-range and the power curve to redline is more linear. The bottom-end will depend on how much duration you're using, but a mandatory high-stall converter isn't an issue. Just for what it's worth, I'm using a Crane HMV-278-2NC cam in my 390. It has fairly high lift with durations of 222 intake and 234 exhaust, but it's ground on wide centers (around 112 degrees as I recall). The idle is good, I don't need a converter -but it would sure pull harder on the launch with one ;-) and I'm pulling 14-inches of idle vacuum. |
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