I broke off the head of one of the adjustment screws and lost the other one somehow.

does anyone know the size for the stock 1977 Datsun 280z 5 speed distributor?

The larger one that holds the dist. adjustment plate to the base on the block is 6mm x 1.00 mm, about 15mm long. The smaller one that goes upward, into the body of the dist is 5mm x 0.8mm, about 10mm long. Nothing fancy, common sizes.

thanks, worked perfectly.

just curious, how did you come across that information?

thanks, worked perfectly.

just curious, how did you come across that information?

As you take things apart and measure them, you start to notice trends. You can also buy gauges at home improvement/hardware stores or online.

Mostly experience. I also like the game of "show me a bolt and I'll tell you where it came from and what year Z its off of." but that's just me.....

Another approach might be to take the dizzy with you to the bolt store and start trying this and that until you find bolts that fit. And SteveJ is dead right, a thread gauge is a wonderful thing.

Just remember 12x1.25, 10x1.5 (engine block), 10x1.25 (suspension), 8x1.25, 6x1.0, 5x0.8, and 4x0.7 make up 98% of the bolts thread specs on a Z. What varies is length, presence of a shoulder, strength (grade), head,type, finish, and at least 10 other things....

Happy thread hunting!