I am really getting this timing thing down but now am wanting to have the right curve. I'm going to put in 600-2800 rpm spring weights. My cam is a 292 244 @50 530 int/exh. It has a rpm range from 2500-7000. I am concerned that since my idle goal is 900 the advance will start to come in at idle. On the other hand I'm wondering if that isn't a bad thing to help it run. Finally I'm going to try running it on manifold vaccuum instead of ported to see how the car idles. Any help will be great. Thanks.

many things factor into what curve is needed. You won't want the mechanical to come in at or just above idle if the cam has a radical idle because the weights will fly in and out making the idle even more eradic. vehicle weight also has an effect on the timing curve, heavier cars won't like a fast curve. testing is the only way to figure what your combination likes. Have a good selection of weights and springs to try and verify with a timing light what changes are taking place. Once you get it right throttle response, drivability and performance will be really good.

You want the timing to come in 2-300 rpm above idle,and all in by 3000-3500, or as quick as you can without detonation. Some run their distributor locked out with all the advance they need,but doesnt work too good for a street car,and definately hard on starters.

What heads are you running??

Here is my engine combo. From what your saying running 600-2800 isn't going to cut it. I will have advance druring idle scrwing up my timing.

I have a 406sb with 292 cam 244@50 530 int/exh lift. rpm performer, 750 dble, afr 195 heads with 1.6 roller rockers and a 4sp. I think this is enough to get the idea. accel hei distributor is what I have right now. It was going to get medium springs with a 600-2800 curve. My cam comes on from 2500-7000.

My comment would be, that the afr's do not need as much advance to make the best power. I think 30 to 32 total would be about ideal. You are correct in not wanting the mechanical to come in during idle, as it will make setting your initial timing very difficult. I would consult with afr for they're opinion on timing curve.