C3 hydraulic clutch conversions / firewall flex
Thread Starter
Cruising
Joined: Jan 2012
Posts: 11
Likes: 0
C3 hydraulic clutch conversions / firewall flex
Who is using a hydraulic clutch in there '79 corvette? Have you had any issues with firewall flex or cracking? Is there a better bracket out there besides the one that most vendors are using? Any help will be appreciated.
Safety Car
Joined: Nov 2008
Posts: 3,726
Likes: 558
From: Seattle Washington
I would not use a Hyd Clutch set up if You plan on using an old school stiff Springed Clutch for this very reason, Firewall Flex. However most modern Clutch's are not as stiff as they used to be and if You need that much holding power then go to a Twin Disc. If you use the search feature there is a lot of info on this from me and many others.
Melting Slicks
Joined: Jan 2003
Posts: 2,877
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From: Doha
St. Jude Donor '08
I'm using a American Powertrain hyd. clutch kit for 3 years now and never experienced any problems what so ever. The feel of the clutch is superb and FAR better than the mechanical linkage.
Melting Slicks
Joined: Mar 2008
Posts: 2,989
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From: Meriden CT
I don't see any firewall movement with my T56 swap, hydraulics from a LT1 Camaro. The master is very close to the pedal box, I don't think it has much effect on the firewall.
Last edited by SH-60B; Sep 3, 2014 at 09:23 AM.
Supporting Vendor
Joined: Apr 2014
Posts: 254
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From: Maryville TN
We use a pre-fabricated firewall bracket, seal and backing plate as shown. The firewall gets sandwiched in between.
I'm not aware of flex issues on C3 but we only use diaphragm pressure plates.
Jeff
I'm not aware of flex issues on C3 but we only use diaphragm pressure plates.
Jeff
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Jeff Kauffman
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Jeff Kauffman
VP Sales and Marketing
Silver Sport Transmissions
2250 Stock Creek Blvd.
Rockford TN 37853
jeff.kauffman@shiftsst.com
Authorized TREMEC Elite Distributor
Thread Starter
Cruising
Joined: Jan 2012
Posts: 11
Likes: 0
Hey guys thanks for your information. I was curious as to who was using hydraulics and the pros and cons. I have a automatic '79 which I would like to go stick with. I will have to thinks about it for a while. Thanks again all.
Race Director
Joined: Nov 2006
Posts: 19,445
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From: Athens GA
St. Jude Donor '12-'13, '15- '16-'17-'18-'19, '21
Do you sell that 3 pc bracket setup separately from the kit that has the master cyl in it?
If so, how much + shipping to 30607?
Need one for a 75 that is being converted to a T56.
Txs
Bman (Dennis)
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Supporting Vendor
Joined: Apr 2014
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From: Maryville TN
We can sell those pieces separately. I'm at Holley LS Fest but you can call 844-609-8187 and speak with Ben about those parts.
Are you using a Wilwood master cylinder? That's what it is designed for.
Jeff
Advanced
Joined: Apr 2017
Posts: 54
Likes: 1
hi Jeff I have this kit for my c3 I’m worried about firewall flex is it common problem on c3
Supporting Vendor
Joined: Apr 2014
Posts: 254
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From: Maryville TN
Melting Slicks
Joined: Jun 2011
Posts: 3,116
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Parts sourced from a couple of vendors.
Also since the original install I switched to a twin disc to get a much lighter pedal feel.
https://www.corvetteforum.com/forums...-corvette.html