master cylinder question

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Hitchcock
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master cylinder question

#1 Post by Hitchcock » Mon Jul 09, 2012 8:49 pm

I'm using a stock dodge truck master cylinder for my car. My question is, do any of you guys know what the port sizes are on these. They are different sizes front to back. The rear port is I believe .500, and is the smaller of the two ports. thanks guys
73 Vette, moly back half
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter

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Re: master cylinder question

#2 Post by John_Heard » Mon Jul 09, 2012 9:42 pm

http://www.dragstuff.com/techarticles/R ... CylPN.html

Should be 9/16-20 and 1/2-20 BUT it's possible you might have 9/16-18 on the front, you'll have to check.

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Re: master cylinder question

#3 Post by Hitchcock » Mon Jul 09, 2012 10:30 pm

Awesome, thanks john.
73 Vette, moly back half
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter

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Hitchcock
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Re: master cylinder question

#4 Post by Hitchcock » Fri Jul 13, 2012 7:02 pm

John_Heard wrote:http://www.dragstuff.com/techarticles/R ... CylPN.html

Should be 9/16-20 and 1/2-20 BUT it's possible you might have 9/16-18 on the front, you'll have to check.

Ok, so I got the zinc coated steel adapters from Jegs. I have the 9/16-20 and 1/2-20. The 1/2 fits perfect. The 9/16, threads in clean and bottoms out on the nut, before the taper engages the flare. The -20 and -18 your refering to is the thread count right? If it is, whats the deal on the fitting being to short to engage the flare?i Or is the -18 and -20 some other unit of measure that I missed and ordered the wrong fitting.
73 Vette, moly back half
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter

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Re: master cylinder question

#5 Post by John_Heard » Fri Jul 13, 2012 9:31 pm

No, you got it right. If it screwed in all the way, you have the right thread pitch (20), just the wrong style adapter. I'd suggest taking the one that is too short to O'Rielly's or Autozone, whatever and ask to pick through their fittings till you find a longer one.

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Hitchcock
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Re: master cylinder question

#6 Post by Hitchcock » Fri Jul 13, 2012 9:52 pm

This is the one I got. Its supposed to be for OE chrysler master cylinders.

http://www.jegs.com/i/JEGS-Performance- ... 5/10002/-1
73 Vette, moly back half
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter

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Re: master cylinder question

#7 Post by John_Heard » Fri Jul 13, 2012 9:58 pm

Guess somebody screwed up... I can tell ya the one I used was for regular brake line fittings, not the 3 AN setup, you might have to do some looking around to find a longer one with that outlet.

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Re: master cylinder question

#8 Post by John_Heard » Fri Jul 13, 2012 10:06 pm


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Re: master cylinder question

#9 Post by Hitchcock » Fri Jul 13, 2012 10:12 pm

John_Heard wrote:Guess somebody screwed up... I can tell ya the one I used was for regular brake line fittings, not the 3 AN setup, you might have to do some looking around to find a longer one with that outlet.

Looks like my options are, plumb it without the an fitting, mill the master cylinder bung down, or get a strange cylinder that uses 1/2-20 on both ports. Shit... guess I will skip the an fittings on that port... :smt013
73 Vette, moly back half
Pump gas 496
Two Pro Systems 950's
Chance 6000 converter

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