682XLR8

Good Morning all-I'm in the process of installing a t56 into my 68 and hit my first snag. Here's what I have so far, a t56 from a 93 Camaro w/ the LT1 so it's a direct bolt-up to my 383

https://www.corvetteforum.com/forums...s-present.html

I already have the master clutch cylinder from an 85 C30 truck and the slave from the Camaro (both from Rock Auto). The problem begins when I tried to install the master cylinder. The threads I have read on the subject (already searched, researched, and Googled the subject) say this is a bolt in but this has proven to be anything but, the lower left mounting hole on the master interferes with the steering column mount and the inlet from the fluid reservoir hits the bottom of the brake booster.
I'd like to hear from anyone who has run into this problem, and what did they do about it....would also like to see pics of the cylinder installed since photobucket has them blocked, email is fine PM me for address

Thanks in advance

derekderek

A brake master cylinder? I think a cylinder diameter is in the pressures developer all wrong for a clutch master.

682XLR8

Meant CLUTCH cylinder....typo on my part, already edited

derekderek

Okay, I just did a quick search and they say that the angles and everything are correct with that clutch master cylinder. Maybe go back through search a few threads and see what different people did.

682XLR8

I've already spent several hours searching through every thread I could find, and still don't see the answer I'm looking for....tried google and other forums as well...hopefully someone that has run into this problem will post up

682XLR8

Neil B

I'm running the Silver Sport/Wilwood Master cylinder, but this might give you an idea of the proper angle.

682XLR8

Thanks for posting the pics Neil I saw the Wilwood kit on Silversports website, may be giving them a call
Yeah I understand needing the proper angle for the clutch rod, the reservoir inlet on top of the truck cylinder hitting the brake booster is preventing that

682XLR8

OK I emailed Silversport this morning, then tried calling this afternoon, no luck with either, young lady on the phone says they've been very busy today so hoping I hear from them tomorrow....curious about the Wilwood cylinder and adapter

AboveTheLogic

I don't know if this helps you, but I used the '85 chevy pickup master cylinder on my '79 and it literally just bolted in. Drilled holes in the firewall and used nuts and bolts. Pictures are in my thread here:
https://www.corvetteforum.com/forums...my-79-a-4.html

Attachment 48354439

682XLR8

Thanks for posting the pic....yeah I saw your thread while I was searching, lots of good info, will be checking it out again as I dive deeper into this project

Looks like you have the same brake booster and definitely the same clutch cylinder as I have, curious if there's anything different about the 79 firewall from the 68? How close is the fluid inlet on the cylinder to the booster?

PainfullySlow

Following this with interest. I was using the thread by abovethelogic for my install which are the same components you are both using.

zwede

I'm using that same truck master cylinder on my '71. I also had the plastic inlet hit the booster. The plastic is thick, so I ground it down a bit until it just cleared. Didn't create a leak, but obviously you have to be careful and only take the minimum off. From memory, I ground it down at a 45 dgr angle on the opposite side of the nipple.

You can also oval the mounting holes in the firewall to get some additional room.

Remember these cars were basically kit cars and no two are alike....

682XLR8

I saw while scrolling through your build thread the other day you have the same transmission

682XLR8

Thanks for the tip, I have to drill two new holes anyway as well as grind out the lower part of the larger hole the clutch rod passes through....will look into it this evening

AboveTheLogic

Went out and took a pic for you:


The fluid inlet can turn in its socket whichever direction makes the most sense. In my case, the reservoir is to the passenger side of the booster so my fluid hose goes that way...
Attachment 48354426

Never realized how close it is until today. I just connected it and pulled it over to the side and moved on with my life. Its been fine...

682XLR8

Thanks for taking the time to snap a pic abovethelogic...yeah it's close but it clears, and that's what counts....real good to hear you haven't had any grief with that cylinder

Went out to the garage last night and took another look at my options. Removed the brake booster (dash is out so it's not hard to get to) and steering column nut plate....looks like if I get creative with a file/die grinder I can bring the booster up about 1/8" and clutch rod hole down by maybe 1/4". That ought to give me enough room
I'll get out there again later and report back on my progress this evening, with pics

PainfullySlow

Funny that my master and slave that I ordered showed up yesterday. Timing is everything. Thank you all for this thread so I have another reference when it comes time to install mine.

AboveTheLogic

I think is an important point. Sliding the cylinder over slightly or tilting it a bit shouldn't give you any adverse effects. Once the system is bled, it's bled. I was pleasantly surprised at how effective it was to gravity bleed the system from dry. I'm not using a stock type slave cylinder so your results may vary.

This is one of those areas I didn't put a whole lot of thought into. I just mounted it up and got it working, have since driven a few thousand miles, including some autocross time without any leaks or clutch issues.

I've had more issues with using the wrong bellhousing bolts than anything else. Get the right bolts. I can dig up the part number if needed.

682XLR8