distributor bolt.

I have a 2.8L in my 85 S10 blazer I need to adjust the timing.
Does anybody know what size the bolt is that holds the distributor down?
I need to go buy a distributor wrench and I don't want to buy the wrong size.

Thanks
W00dy

Ok I think it's a 15mm.
Can't find a 15 mm distributor wrench in town so I'll just have to order one online

A 9/16" should work also.

Too bad I think I probably have 2 of 'em relegated to the old obsolete tool drawer. I do believe I bought at least one of 'em off the tool rack at a local auto parts store.

A 9/16" should work also.
A 9/16 is larger than a 14mm but smaller than a 15mm they don't interchange.