Reply to "3785 Gets a 400 swap, fabbed 180's and fabbed mufflers"

Thanks for the Comments!

I went back in this morning and added some more pics that I had forgot to post last night. I also did some tweaking to the text.Never ends..

I realized that the way I presented this segment made it appear like these "built a car in a week" reality shows where everything just goes together smoothly.
I want to say that at the point of the last pics you are seeing a months worth of construction time.
Some of the pipes I redid 3 and 4 times to get them right.
It is very tough to build in the middle where you have the beginning and end tube established because the transition has to match perfect.

The cluster at the collector where Cyls #3,6and 7 come together took me 4 hours.

Joules: Getting the primary lengths the same is a debate that has raged on for years in the header community. Sides For and Against are very passionate about their views.

*Edit* Joules, As I reread my above answer I realize that I didn't answer your question at all.Here is my view.

As I understand it,the side for equal length believes that equal length primairies are important to achieve the best scavenging characteristics.They believe this to be from the pressure wave timing being the same from cyl to cyl. They also believe that equal length achieves better cylinder to cylinder balance as the individual cylinders don't go in and out of tune at different RPM's. They believe this also has a positive effect on the intake side of the motor.

As I understand it, the side against equal length believes that the discrepancy broadens the torque band which is benificial to a street car. They also believe that two tubes both 34 inches but one having more bends than the other will not time equally anyway. They also believe that no one knows the correct length to build their headers to so everyone builds them equal to the wrong length.

You can decide who you think is wrong or right for your application. *End of Edit*

My thinking was simply to get them to a similar length to reduce the cylinder to cylinder imbalance and to aid scavenging.

From a construction stand point building a equal length header is very very difficult.
I have done it but I didn't do it here.

Gary, I wondered where you had gone.
1905 is feeling neglected....