Hello all, new guy here, joining to learn a few things I hope.
Just rebuilt a 351M from a 76 Cougar for my 87 F150. Things were going well at start up then she dies. It ran well for approx 3 mins, then nothin. Long story short I pulled the distributor which came from the 87 to find the shaft gears were eating away to the point that the rotor wasnt even turning. So I grabbed another distributor from and older f150 parts truck "78 I think, and am workng on getting her started again.
Question is: how much difference is there is these distributor shafts and gearing because they both seated well. Thanks

 

No difference. 351c\m, 400m, 429\460 all use same dist. 351w dist is different and wont work.