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Flowtech Headers - 31150FLT on a '79 with the 403 Olds

1.1K views 6 replies 3 participants last post by  Bryan J  
#1 ·
I was looking at installing a set of Flowtech Headers (31150FLT) on my '79 Trans Am with the Olds. 403 engine. It has power everything and factory air. Has anyone else installed these same headers and did you experience any fitment issues? I have read other strings where people have had fitment issues with headers, so I was curious if anyone has tried these. Or if you have a suggestion for a header that is a solid fit.
 
#2 ·
For mine I’m running the same headers with a pypes x-pipe system 3”, to install I had to remove the oil filter housing and remove the starter for ease of installation, also the oil filter is a little too long and will hit the header so a shorter one would be the way to go, I had to use a ratchet strap hooked to the frame to wrap around the left header to bring it out more to match up to the x pipes aswell as modifying the flange on the pypes, overall it’s doable but it depends on what system you wanna run off the headers, it sounds good though lol
 
#5 ·
Correction to the Flowtech headers. They are part #11150FLT, and they went on really well. I had to remove the starter to get the driver side installed, and the oil filter adapter on the passenger side to get that side installed. Other than that, it was a smooth installation. I was able to use the original starter, which was a concern raised by some owners. I did destroyed the original dip stick tube during installation. You will have to remove the tube to get the headers into place. That's where it got destroyed. Overall, very pleased with fitment.
 
#7 ·
Well....I have a second one on order. To get it to fit I didn't have to do too much bending. However, I didn't realize that it was resting against the starter power terminal. After a little smoke when I attempted to hook up the battery, I found this little issue. I was able to bend it around to make clearance, but by bending the tube I can no longer get the dip stick out and the press fitting that holds it in the block is now so loose that I can easily remove the entire assembly. Hopefully round two goes a little better, but yes, some bending is necessary.