Firewall Flex 67-67 F Body

Walt Reynolds · 01-04-2011, 01:56 AM

Has anyone experienced firewall flex in a stick car and if so what is the recommended repair?

Dwight Southerland · 01-04-2011, 09:36 AM

Moroso used to make a brace that bolted to the two bottom master cylinder bolts and extended to the subframe to help prevent firewall flex for the clutch pedal pivot. It's an old part (like me. Only I'm an old fart!), from the 70s. Is that what you are talking about?

Walt Reynolds · 01-05-2011, 11:42 AM

Yes. I just emailed Moroso to see if they have anything like that. Thanks for the info. If they don't have anything I will have to fabricate it myself.

Geerhead55 · 01-05-2011, 04:27 PM

I've seen Chevy II racers make a brace that runs from the master cylinder to the top of the shock tower. Theres quite a bit of movement on those cars,,up to 1/2 an inch with the old heavy clutches we used to run back in the '70s,,,maybe its better with the modern clutches.
Danny Durham

jim powers · 01-06-2011, 11:40 AM

jimmy parker has a great working brace for this application pm him here

Mike Taylor 3601 · 01-06-2011, 02:49 PM

My guess is you have old 2800-3200 lbs. pressure plate? If so take it out get a good clutch setup that will fix your firewall flex and save every driveline piece in the car.
Mike Taylor 3601

01-04-2011, 01:56 AM	#1
Walt Reynolds Junior Member Join Date: Mar 2009 Location: Lucas (Dallas) Texas Posts: 40 Likes: 0 Liked 0 Times in 0 Posts	Firewall Flex 67-69 F Body Has anyone experienced firewall flex in a stick car and if so what is the recommended repair? Last edited by Walt Reynolds; 01-04-2011 at 08:42 AM.

01-04-2011, 09:36 AM	#2
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,999 Likes: 64 Liked 772 Times in 192 Posts	Re: Firewall Flex 67-67 F Body Moroso used to make a brace that bolted to the two bottom master cylinder bolts and extended to the subframe to help prevent firewall flex for the clutch pedal pivot. It's an old part (like me. Only I'm an old fart!), from the 70s. Is that what you are talking about?

01-05-2011, 11:42 AM	#3
Walt Reynolds Junior Member Join Date: Mar 2009 Location: Lucas (Dallas) Texas Posts: 40 Likes: 0 Liked 0 Times in 0 Posts	Re: Firewall Flex 67-67 F Body Yes. I just emailed Moroso to see if they have anything like that. Thanks for the info. If they don't have anything I will have to fabricate it myself.

01-05-2011, 04:27 PM	#4
Geerhead55 VIP Member Join Date: Sep 2002 Location: Tacoma, Washington Posts: 1,632 Likes: 0 Liked 5 Times in 5 Posts	Re: Firewall Flex 67-67 F Body I've seen Chevy II racers make a brace that runs from the master cylinder to the top of the shock tower. Theres quite a bit of movement on those cars,,up to 1/2 an inch with the old heavy clutches we used to run back in the '70s,,,maybe its better with the modern clutches. Danny Durham

01-06-2011, 11:40 AM	#5
jim powers Member Join Date: Nov 2001 Location: manville nj Posts: 359 Likes: 198 Liked 13 Times in 10 Posts	Re: Firewall Flex 67-67 F Body jimmy parker has a great working brace for this application pm him here

01-06-2011, 02:49 PM	#6
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,369 Likes: 349 Liked 293 Times in 101 Posts	Re: Firewall Flex 67-67 F Body My guess is you have old 2800-3200 lbs. pressure plate? If so take it out get a good clutch setup that will fix your firewall flex and save every driveline piece in the car. Mike Taylor 3601