Quote: What do stock slants like for initial timing? i'm running my 67 as 5BTDC seams to run well there.. So to get a total of 30degs I would want 25deg of advance on top of 5deg initial, is that correct?
i'm considering just buying a replacement Cardone distrib, are these well made?
Doc could you explain "drops out" at WOT. Doesn't /6 vacuum advance run off port vacuum source? and doesn't that increase the amount of vacuum closer you get to WOT or am I all mixed up??
Build your distrubutor using the '9' degree advance unit. Set your initial timing to 10 degrees. You'll have 28 degrees total mechanical advance. I use two aftermarket springs from a recurve kit. You'll have to experiment with this, but what works for me is a curve that starts at about 1100 RPM and is all in by about 2500 RPM. Use the 8.5 vacuum unit. This will give you a total of 28 + 17 = 45 degrees spark. Most vacuum advance units are adjustable with an allen key. Inserted through the vacuum hose port, turn the adjusting screw all the way clockwise 'in'. This gives the fasted rate of vacuum advance. If the engine pings, adjust the screw counterclockwise two turns at a time until your ping goes away. After you install your distributor, note if your timing light stays steady or 'floats' around on the balancer. If it floats, you either have too much end play or, more lilely, have excess play in the shaft bushings.
Rather than buying a Cardone, I would buy an NOS someone keeps listing on Ebay for something like $50.
The vacuum port that connects to your distributor is positioned right above the throttle plates. As you open the throttle, the plates expose the port to manifold vacuum. At light throttle, your manifold vacuum will be relatively high. As you open the throttle further, while the port is exposed, your manifold vacuum will drop with increasing throttle opening. Maximum spark at wide open throttle (WOT) is what most people refer to when talking about your distributor's spark curve. At WOT, your manifold vacuum will drop to near zero. That's why they do not include the added spark from the vacuum unit when referring to you maximum timing. You should run in the neighborhood 28 degrees max timing (mechanical, not including vacuum). How much additional timing you may run using vacuum must be determind by driving the car.
Mitch
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.. 40 degrees would sure be a lot. It says at schucks website that the module is not included?