I just installed Dynatech headers this weekend along with the help of another local vette owner. The install was straightforward. The drivers side header went in from the bottom and the passenger side went in from the top. We did not need to remove the valve covers or unbolt the steering shaft.

The O2 sensor clearance in the front is limited, but there weren't any issues on making them fit. As long as you are sure to have the headers aligned and follow the alignment procedure you should not have any issues. We did use a few tie wraps to pull the O2 sensor wiring out of the way.

I've put around 350 miles on the car since the header install and I have not had any issues with leaks or codes.

Overall I am very satisfied with the build quality and design of the headers. I plan to dyno tune later this week and will post numbers as soon as I get them. :cheers:

 

Great :cheers:

Looking forward to the numbers. How close are the front O2 sensors, some had reported they hit the tunnel.

 

Thanks for the info. So we might be adding weight to our 97-00 cars with dynatechs.
Oh well 30+ hp will make up for that.

Thanks

 

Cool, waiting to see...
:cheers:

 

:confused: Yes the stock manifolds do weigh about 12 lbs each and the long tubes weigh around 17 lbs each, however you have to consider weight of entire system. With the long tubes replacing much more real estate than the much shorter stock exhaust manifolds.

 

The front O2 sensors are pretty close to the tunnel, but they are not touching. I think if you follow the alignment section in the instructions they provide you should not have any issues. Just be sure to use some tie wraps on the wires to keep them from touching the headers.

 

A very nice looking header, if I was going to get another set of headers these are the ones I would buy....no doubt.

 

Good to see they werent too difficult to install....How is the SOTP feel? I know you havent dyno'd her yet, but does it feel different? What about sound differences? Cant wait to see your dyno!! :cheers:

 

Did you clean out your headers? Mine had grinding funk in the tubes still. I need to spray them out with brake clean, then use air to get the rest out.
Reversion could pull that crapola right back into the engine, or it could clog the cats.

 

SOTP feel is much better. I haven't made many WOT runs yet, but I have noticed that the car pulls much stronger through the RPM band. The car breathes a lot better in the higher RPM's compared to the stock manifolds.

The exhaust note is a little throatier and there is a definite decibel increase under throttle.

 

I originally planned to put the headers in the bath tub and wash them before installing them, but when I looked at them out of the box they did not need anything cleaned. I did get a recent production batch, so there may be a difference in the production cleaning process.

I should have dyno numbers tomorrow afternoon!

:cheers:

 

Mine looked clean too, but I stuck my finger in the tube with the air fitting to see if I needed to smooth them out, they were smooth, but there was some black gritty stuff in there.

No biggie, I'm just ****. I've been beating myself up because I scrached an AC line with the header installing it. Its just cosmetic, but it bugs me.

Can't wait to see your dyno #s!

 

Here are the dyno numbers:

http://forums.corvetteforum.com/zerothread?id=819977

 

I just finished my install, here's a rundown on how it went.

Did the job on Rhino ramps in front and (sometimes) a floor jack, in the rear on jackstands (about 20" high).

I did pull both coil packs, not sure if it was needed, but far too many things sticking up on them to get hurt on. Also removed spark plugs and dipstick tube.

I did relocate the altenator but did not remove it from car.

I did not pull either valve cover.

I did not loosen either motor mount.

I did not loosen or remove starter, oil filter, or the ground strap.

I did not remove the sensor in the drivers side head (water temp?) but I put an old bolt in beside it to protect it, HIGHLY RECCOMENDED.

Passenger side (from top), twisting and paitence gets it by the starter, but the A/C line and the air tube cause some headaches, a little persuasion with the A/C line though and it went right into place.

Drivers side (from bottom), here's where the car must be quite high (floorjack under cross member was high enough), lots of twisting with some help from above with guiding & pulling gets it in.

After that it is all easy going. There is another post on some fit issues, passenger side doesn't seem to be quite square, but not a big deal. The rear O2 sensors will (just) clear the tunnel plate, but to be sure I drilled two 2" round holes in the plate to remove the possiblity of them rubbing. The bung for the dipstick bolt is not placed exactly right, and since the bracket is "L" shaped I put a slight cut in it with a dremel and gave it a slight bend to adjust for proper fit, a minor adjustment. The biggest issue though is very little clearance with 1 tube on the drivers side and the steering shaft, on mine about 1/4" - 3/8", I think this should be at least 3/4", although it hasn't caused any trouble yet, but I'll keeep an eye on it, if anything develops I can forsee a slight dent being put into that tube. :sad:

Going for tuning next week. :D