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Old 11-04-2013, 09:50 PM   #1
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Long tubes install

Plan on installing long tube headers on my 98 GT. My question is; are there any kind of body modifications or fabrications that need to be made to the K- member or body for them to fit? Probably going with BBK long tubes. Any other helpful advice would be appreciated. I'm currently taking the K-member off and getting old manifolds off.
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Old 11-04-2013, 11:06 PM   #2
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Just drop k member and support engine up ,
and should be a breeze
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Old 11-08-2013, 09:51 PM   #3
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fyi, if you go with bbk lt's you're going to have to remove the passenger side header every time just to remove the transmission for any work needed such as clutch, etc.. the passenger bbk header snugs the bellhousing which will not allow the trans to slide off the block.
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Old 11-08-2013, 11:40 PM   #4
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Quote:
Originally Posted by Slow4V View Post
Just drop k member and support engine up ,
and should be a breeze
Haha you made it sound so easy!

To the OP, you're definitely going to have to remove the k member. I did mine in my garage, and it took me 11 hours to comeplete. And its true with the tranny, you will have to remove that side to take it out. Also, you will have to disconnect your steering shaft, but that goes without saying since your dropping the k member.
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Old 11-08-2013, 11:46 PM   #5
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Prepare thy anus, the modular is a ***** to do headers on. But no, nothing needs modified and the BBKs come with an indent already in the primary where the steering shaft goes though which is a plus for some and a sore subject for others.

And yes, you need to remove or at least unbolt the passenger header every time you need to pull the trans. That is unless you do the t45source adapter plate that gets rid of the integrated bellhousing.
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Old 11-09-2013, 12:12 AM   #6
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Oh one thing I'll add is about the header bolts. Hopefully you're using the locking kind. Otherwise, after a few heat cycles, youre probably gonna have some loosen a bit. If it does, be prepared to have to tighten them back up.
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Old 11-09-2013, 09:08 AM   #7
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Modulars already have studs for the headers. Except you can't use the studs in one spot with the BBKs and they supply a bolt to put there instead.
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Old 11-09-2013, 09:39 AM   #8
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Quote:
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Modulars already have studs for the headers. Except you can't use the studs in one spot with the BBKs and they supply a bolt to put there instead.
Yeah, most re-use the studs, but since its such a pain to tighten them down when they loosen, I use the locking bolts. They cost a little bit (like 50 bucks), but might as well do it since you've got it apart anyways. And it'll save you a possible huge hassle in the future.

I would have thought that the stock ones wouldn't loosen up since they were on the car from the get-go, but once you take them off and re torque them, they have the chance to be the bain of your existence.
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Old 11-09-2013, 05:26 PM   #9
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I used the stage 8 bolts too. It is a pain in the nuts to get longtubes on with bolts. If you re-torque the stud nuts 2 or 3 times after a few heat cycles they should not move but YMMV.
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Old 11-09-2013, 05:31 PM   #10
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Lt's are sweet but for the hassle and price not worth it imo unless its a straight up drag car.
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Old 11-09-2013, 06:54 PM   #11
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Thanks for the help guys. I'm seriously reconsidering these LTs lol. As sweet as they are I'm probably just gonna go with BBK off-road x pipe and flow master cat back.
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Old 11-09-2013, 06:58 PM   #12
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I would def go with a midpipe/catback. The stock manifolds are not restrictive. Save the money from longtubes for a PI swap which can be done for about the same price and you'll get WAY more returns especially with the higher compression of a NPI shortblock.
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Old 11-09-2013, 09:24 PM   #13
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Sounds good man. I'll go that route.
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