HELP Jegs crossmember

JJake

Not-quite-so-new-guy
Thread starter
Oct 14, 2014
16
3
I have a 1978 Cutlass Salon that originally had a 231 V6, replaced it with a 455 Olds/TH350. I am going to install ARH headers and dual exhaust. The trans crossmember will have to be modified or changed. My question: is the chevy SB crossmember the same as the Olds crossmember? Jegs crossmember is half the price of a G Force but is listed for a SBC. Has anyone used the Jegs crossmember with an Olds 455/TH350 combination?
 

pagrunt

Geezer
Sep 14, 2014
7,868
113
Elderton, Pa
It will work, the engine has no real affect of application, just engine. One note to keep in mind that the pipe humps are spaced to clear how the Jegs (Heartthrob, Summit) exhaust kits fits. The G Force humps allows more pipe space but are wider & might have the Jegs pipes the hit/rub. I've had both crossmembers on my frame as I started to put it together but only fitted both my Jegs & Pypes kits with the G Force one.
 
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abbey castro

G-Body Guru
Oct 31, 2015
668
93
Harker Hts TX
My G Force with plenty of room on both sides to run the pipes. I even run CATs.
 

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383_StealthRam

Greasemonkey
Supporting Member
Dec 29, 2016
179
63
I have the G-Force in mine with 4L60 and it's been great no complaints, granted I think when I bought it 10+ yrs ago it wasn't that expensive, and there wasn't much in the way of alternatives iirc.. With 3" exhaust there's plenty of clearance, the exhaust tucks up nice and high to where it's not visible at all from a side view of the car. It's a really solid piece imho.


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57 Handyman

Greasemonkey
Feb 6, 2017
243
63
I recommend you look up the Summit brand equivalent for your application if you're considering a G Force transmission cross member. It is a little cheaper. I bought and am using the Summit brand in my 87 El Camino with dual exhaust. Interestingly enough, the installation instruction sheet was a copy for the G Force sheet.
 
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tngbody

Apprentice
Sep 17, 2019
89
8
Just out of curiosity, how much space do you need between the exhaust pipe and crossmember?
 

383_StealthRam

Greasemonkey
Supporting Member
Dec 29, 2016
179
63
Just out of curiosity, how much space do you need between the exhaust pipe and crossmember?
I don't think there's any hard and fast rule per se, but I would gauge it by simply having enough room that you could fit at least your finger between the pipe and the x-member? Somewhere in the neighborhood of 1/2" or more should be more than sufficient so long as there's no actual contact? You'd want to be sure your engine and trans mounts are in good shape so you're not moving so much on engine torque to cause contact either. I'd say it's a judgement call based on your particular setup, engine, headers, pipe diameter, etc..
 
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