took the car too the track.had ignition problems /installed a brand new hays stinger ignition set up.dist/box /borrowed it from a buddy that bought it new and never used it/ set timming at 42 at 3000 rpm system takes timming out retards it down to 30 at the big end sounds like a different engine caint wait too try it out .hopefully it dosnt blow the 12 bolt all over the track,ill post some times when i get back from the track and some pics
The old S4 ignition retarded the timing 1 1/2* per 1,000 rpm increase after 3,000 rpm. That would be 4 1/2* retard if you crossed the line at 6,000 rpm, and 5 1/4* if you crossed at 6,500 rpm. Given those numbers you'd be looking at totals of 37 1/2* to 38 1/4* after retard. Without knowing your build and if you're running iron heads I'd suggest dropping your timing back from 42* to something in the 36* to 38* range before retard. I'd try to keep your after retard total at 32* to 34* if you're running iron heads.
this same engine went 10.52 in a 68 buick wagon with the same tune.maybe theres a little more in it with some timeing experimenting ill give it a try thanks / see what happens ill let ya know
I agree with Dave that you're looking for 32-34 at max rpm. I believe it should say Stinger S4 on the box to have the 1.5 per thousand retard built in. Technically it doesn't start retarding at 3000 rpm but is actually retarding from "0" rpm. It just looks like it is retarding at 3000 rpm on a particular car because that is when the mechanical advance finally stops and the retard action is evident after that rpm. With a timing light you can easily see the retard working as the rpm climbs after all the advance is in. I always liked the retard feature of the box and it never failed to help performance but I was never impressed by the actual spark output of the ignition so I would hook the output of the box into the points input of an MSD 6A which gives you the best of both worlds.
