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Old 05-21-2011, 08:35 AM   #1
analogkid455
 
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Default FlowTech Header fitment

I understand some people having fitment issues with these headers on G-Bodies.

I was looking at the application for these headers and they say they will also fit 77-81 F-Body AND 68-77 A-Body. This may be why they don't fit to good.

BUT!, if headers from A and F bodies fit then why can't we buy those and put them on our G-Bodies?

For those that have had fitment issues with the FlowTech headers, where are the problem spots?
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Old 05-21-2011, 08:53 AM   #2
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Default Re: FlowTech Header fitment

I know i guy who put 455 a body headers on his 455 in his 86. He told me that one side fit ok the other he had a couple of hours into modifing.
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Old 05-21-2011, 08:53 AM   #3
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Default Re: FlowTech Header fitment

Looking at the collectors they are crooked at exit.. kinda like a hillbilly with wandering eyes.. A good friend of mine has them on his Cutlass and they were a pain to install..
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Old 05-21-2011, 12:05 PM   #4
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Default Re: FlowTech Header fitment

Quote:
I know i guy who put 455 a body headers on his 455 in his 86. He told me that one side fit ok the other he had a couple of hours into modifing.
Sorry, I should have said for a SBO.

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Looking at the collectors they are crooked at exit.. kinda like a hillbilly with wandering eyes.. A good friend of mine has them on his Cutlass and they were a pain to install..
LOL! I have noticed this with other Olds headers as well. WTF.

Even though they were a pain to install, was there any interference with anything? In other words, did he have to beat them like a red headed step child?
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Old 05-21-2011, 03:38 PM   #5
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Default Re: FlowTech Header fitment

i have a-body headers in my SBO g-body. take my advice and buy the right ones, its a pain to install/fabricate.
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Old 05-21-2011, 04:55 PM   #6
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Default Re: FlowTech Header fitment

I have a set of Hedmans in my 87 and they were not too bad to install considering I did it upon dropping the motor in the car. The exits are a little crooked but no clearance issues for me.
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Old 05-21-2011, 09:25 PM   #7
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Default Re: FlowTech Header fitment

I have the flowtechs in my my 86. The pass side was fine but the driver side was another story. They hit the starter bad.
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Old 05-22-2011, 09:11 AM   #8
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Default Re: FlowTech Header fitment

I tried a-body sbo headers in a g-body sbo and they were hitting all over. I trimmed here, there and flattened, dimpled some tubes then decided it wasnt worth it. So I took those headers and cut off all the tubes and made shortie bbo headers.
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Old 05-23-2011, 05:00 AM   #9
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Default Re: FlowTech Header fitment

I have no idea why anyone would try to put A-body headers on a G-body when there are companies that make G-body headers. I had a buddy try to put A-body headers(68-77 hookers) on his 87 cutlass, what a clusterF*** that was, They DO NOT fit right.

That being said, the hedman G-body headers don't fit too bad. If you don't have a mini-starter you will probably need one, most G-body headers are tight at the starter. I have used BlackJack and Hedman and both required a mini-starter if you didn't want to modify tubes. The reason the collectors turn out a little rather than going straight back is that they tuck in to the motor for clearance then turn out for transmission clearance, you can drop the trans without unbolting the headers.

I have hedman 78-87 small block headers on my 65 right now, they clear my powermaster 9510 with no issues.
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Old 05-23-2011, 11:56 AM   #10
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Default Re: FlowTech Header fitment

I was just wondering why they would list the same part # for G,F AND A body cars. Clearly they are full of it.

I also found some F-body headers for SBO with a 1 5/8" primary tube. This was the real reason for the question. Previously I decided to go with the Hedmans. Looks like I will stick with that decision.
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Old 05-23-2011, 04:24 PM   #11
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Default Re: FlowTech Header fitment

I have flowtechs in my car. I JUST installed them a few days ago! No problems hitting. The passenger side points out toward the door which sorta sucks, but exhaust can be made to work with it. They fit fine....no oil filter or starter interference, but the starter and oil filter adapter need to come out for the install. The starter will need to be reinstalled with the header in position, but not bolted in....so both the header and the starter need to go in together. It's a pain, but they don't hit once installed.
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Old 05-23-2011, 05:07 PM   #12
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Default Re: FlowTech Header fitment

my driver side one was usable, little beating to clear shift linkage but the passenger side was nowhere near the exhaust cutout in the g force crossmember, couldnt even get a pipe in there. plus i ordered them ceramic coated, whats a joke that was, were rusty in 6 months.
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Old 05-24-2011, 05:58 AM   #13
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Default Re: FlowTech Header fitment

Thanks guys, good stuff to know.

Thanks to everyone for their responses.
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Old 05-26-2011, 07:54 PM   #14
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Default Re: FlowTech Header fitment

The starter / header install is a pain . I learned that I had to tie the header up with wire then install the starter then you can put the header bolts in . Doesnt hit the starter but really close , I still need to get around to making a sheild . The oil filter housing like has to come off like others have said , no biggie on that one . But the collector is about an inch maybe less from the oil filter once on . I wrapped my headers with that header wrap , and put a half inch of wrap right where it sits under the header to keep from cooking the oil ,}- . My exhaust was the pypes universal x pipe system , so the collector exits didnt matter so much for me . . I like the quality of the headers for being fairly cheap ones , just wish there was more starter room even for my mini starter , and the oil filter location sucks . Not bad tho IMO .
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Old 05-26-2011, 09:25 PM   #15
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Default Re: FlowTech Header fitment

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Originally Posted by wagon View Post
my driver side one was usable, little beating to clear shift linkage but the passenger side was nowhere near the exhaust cutout in the g force crossmember, couldnt even get a pipe in there. plus i ordered them ceramic coated, whats a joke that was, were rusty in 6 months.
Rather than beat my header, I just trimmed the shifter linkage with a cutoff wheel. There was enough extra metal there that could be removed with no injury to the mechanism/functionality....I had to take maybe 1/4" off the edge of the trans linkage mount.
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Old 05-27-2011, 09:49 AM   #16
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Default Re: FlowTech Header fitment

Cool, thanks guys.
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1974 Omega 468 BBO 3620# 11.85 @ 112 MPH 1.62 60ft 87 octane
http://www.cardomain.com/ride/829130

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