Dual exhaust cross member
Dual exhaust cross member
I am running headman long tube headers and was wondering how many people have modified there stock transmission cross member. My car is running a 700r4 and its tight under there for dual exhaust.
Joined: Mar 2001
Posts: 10,425
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Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Dual exhaust cross member
Joined: Mar 2001
Posts: 10,425
Likes: 2,089
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Dual exhaust cross member
I don't know all the options for plug and play. The adapter plates for different transmissions are sold separately by Holley. You would have to ask them. Maybe you would have to make your own adapter plate.
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Joined: Nov 2016
Posts: 207
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From: Connecticut
Car: 1991 Camaro RS
Engine: Hot 355ci
Transmission: Beefed TH350
Axle/Gears: 4:10
Re: Dual exhaust cross member
You CAN run it under the cross member, may be too low depending on what size your using.
I switched to a th350 tubular crossmember for my swap, but the original is literally straight into the cross member, so your going to have to cut it, and weld + mount it in the tunnel away from where you need the header.
Supreme Member
Joined: Dec 2005
Posts: 9,919
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From: 53.0907° N, 113.4695° W
Re: Dual exhaust cross member
I've modified my OEM crossmember for as much ground clearance as possible.
This is with Hedman LT headers. The y-pipe was built using mandrel bent pieces welded together in sections.
Still affords about a beer can's worth of ground clearance although truthfully, I've crunched the y-pipe more than once. This is with a "two inch" drop spring package.
This is with Hedman LT headers. The y-pipe was built using mandrel bent pieces welded together in sections.
Still affords about a beer can's worth of ground clearance although truthfully, I've crunched the y-pipe more than once. This is with a "two inch" drop spring package.
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Re: Dual exhaust cross member
That more ground clearance than going totally under the stock flat cross member. I plan on fabbing up my own exhaust after I install my sub-frame connectors. Wanna make sure what all space I am gonna have.
Joined: May 2008
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From: pawtucket RI
Car: 1986 iroc
Engine: alum. head 350 supercharged
Transmission: 6speed
Axle/Gears: ford 9in 3.90 35 spline moser axles
Re: Dual exhaust cross member
i just bought this
but haven't installed it yet
https://www.holley.com/products/ls_p...ts/71222005HKR
but haven't installed it yet
https://www.holley.com/products/ls_p...ts/71222005HKR
Supreme Member
Joined: Dec 2005
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From: 53.0907° N, 113.4695° W
Re: Dual exhaust cross member
I have the same crossmember sitting on the shelf.
I was kind of forced into it as my 700R4 is built around a Corvette transmission case and that puts the rear transmission mount of the extension housing rather the case itself. Now my rear trans mounts puts the installed length within a 1/16th of that of a TH400.
Plenty of room for exhaust with this part and it gets the arm off the trans too.
I was kind of forced into it as my 700R4 is built around a Corvette transmission case and that puts the rear transmission mount of the extension housing rather the case itself. Now my rear trans mounts puts the installed length within a 1/16th of that of a TH400.
Plenty of room for exhaust with this part and it gets the arm off the trans too.
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