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distributor calibrating
I ordered a Duraspark dizzy from Summit, and nowhere on their order page can I specify which timing settings I want. The armature arms are 16L and 21L, this is going to be too much timing isn't it? My question is how do I change it? My car has the 10L, 13L in it now but it is a points/pertronix dizzy. Can these parts be interchanged? Anybody know what my options are?
Those parts are interchangeable, I would use the 13L slot. This will give you 26 degrees of mechanical timing. I would also order the mr gasket spring kit (part number 925D) and if memory serve me remove the heavy spring from your distributor and replace it with one of the springs from the kit. Set you initial (base) timing to 10-12 degrees, that along with the 26 degrees will give you a mechanical advance total of 36-38 degrees of total timing. Your car will run nice with those settings. After you get that part lined out we can help you dial in your vacuum advance. Good luck.

351w - Ford racing GT40X 178 cc aluminum heads - Ford racing(crane) 1.7 roller rockers - Comp Cams 280H magnum cam .544" / .544" lift - ARP hardware - hedman longtubes - magnaflow exhaust with X pipe - Duraspark - MSD digital 6al box - MSD TFI coil - optima red top battery - tuff stuff 140 amp alternator - weiand stealth intake  - edelbrock 1406 600 carb  - march pullies and brackets - Be cool fan controller - derale electric fan - FMX trans - motive 4.11 gears - traction lok - lakewood traction bars.                                            

How do you get the armatures out?? Does the cam gear have to come off?
Omie01;244092 Wrote:How do you get the armatures out?? Does the cam gear have to come off?

Yes the reluctor wheel has to come off and then a wire clip inside the shaft has to be removed to free the "armature arms".

More info here: http://www.reincarnation-automotive.com/...index.html

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
I'd use the 10L slot and 16 initial for a total of 36 mechanical to start with. Just an opinion. The link TommyK posted is a great resource, as is the business that put it up. Thanks, Tommy.
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