S13 240SX slave is 3/4 inch bore and master is 5/8.

Same for S14s. This info is from the FSM.

Steve

Ah, now this is good. Thanks Steve. What's the FSM? I couldn't find this online anywhere. Field Service Manual, maybe?

Factory Service Manual.

Wow I'm slow when it's early. Shoo.

Yeah Gary, I tend not to post if I am just repeating good information or the question is so redundant that it is not worth the time. Also, I am better equipped when seeing these things first hand and not from usually inaccurate descriptions. And if I have no clue or not positive, I won't just add to the confusion:)

Edited October 26, 201014 yr by Rich 71 240Z

Yeah Gary, I tend not to post if I am just repeating good information or the question is so redundant that it is not worth the time. Also, I am better equipped when seeing these things first hand and not from usually inaccurate descriptions. And if I have no clue or not positive, I won't just add to the confusion:)

Not to be a jerk, but you simply copy/pasted my response from zcar.com. At least give credit when you repost other's info.

I was going to post the answer here myself, but since the OP asked the question on both forums, I didn't think there was much value in posting the same answer twice.

http://www.zcar.com/70-83_tech_discussion_forum/need_help_clutch_master_info_please._894135.0.html

So funny. OP noticed this and was like, "WTF?" On one forum, his name is Jeff and on another his name is Rich.

The info was good. That part that you put in bold there Jeff was the funny part.

Might be another three years.........