The recurve guy isn't an hour away.... he is you.
To limit advance in a Ford style distributor requires a lil welding or jb weld.
The ones pictured below are a Duraspark but other types are roughly the same.
First remove the cap, than the reluctor (don't lose the roll pin). remove the vac advance arm E-clip and remove the whole vac advance assembly. There are two phillips head screws that hold the plate with pickup to the distributor. Remove it.
You'll be looking at this:
There is an annoying clip that holds the advance mechanism in place. Remove it. Also remove the two springs.
Your advance arm will be stamped. The one in this picture is 21L which means 42 degrees of advance. (I know)
On the other side will be another size slot. With centrifugal force the spring tension is finally overcome and the arm moves between that pin in the center. The size of this slot determines total mechanical advance.
I remove the whole arm assembly and weld it up.
This is the worst weld you'll ever see:
I've also welded them up entirely prior to cutting the slot
Use an angle grinder, die grinder, whatever to cut the slot you need. In the case of BBM heads if you want 18 degrees of advance, and 34 total you'd want an 8L or 16 degrees of mechanical advance. 18initial + 16 mechanical = 34 total (for the record with your setup I think I'd be more at 20initial 32 total, but whatever)
This would be achieved with a .350 size slot, like this one:
Sometimes there is a lil rubber cover on the advance pin, this obviously changes your full mechanical a small amount.
See the rubber bushing on the advance pin in this picture below with the welded/ground slot all installed.
You could do the same with JB weld I assume..... I dunno I have a mig welder, so that is what I do.
Drew
