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Engine Masters ran a series of dynamometer runs with various header configurations, including denting them in for clearances. Dents did not affect the power output. If I remember correctly, they dented them in about 1/4 of the tube diameter.

The yellow wire (and orange one) appears to be from an unfused switched power source. I recommend installing an inline fuse or switching them to a fused source. The fuse next to them feeds the wire/purple stripe wire which also provides switched power to the radio. The two fuses on the right...

If you haven't already obtained the wiring diagrams for your car they are available on the forum Wiki: https://wiki.7173mustangs.com/ Post #3 in this thread has a guide on reading wiring diagrams https://7173mustangs.com/threads/how-to-read-wiring-diagrams.40106/#post-413573 You can also...

Open the throttle a little and try to move the choke plate by hand. It may be stuck from just sitting for so long. Yes, on a cold start the choke plate being open will cause a lean condition which can cause a backfire through the carburetor.

You are correct, that is not coincidence, here is a picture of the stock location for '66 and earlier 9-inch differentials. The stock fill plug is a pipe thread plug, which does not require a gasket or flat surface. I believe that I would cut a 1/2" black pipe coupling and weld it in and use a...

This is good information. I would also post it on the forum's Tutorial section: https://7173mustangs.com/discussion-forum/tutorials.126/

There are a wide variety of rubber moldings for windshields. Do an internet search for 'windshield reveal moldings' and you'll come up with a lot. Here's what comes up on Amazon...

I'm really sorry to hear about your parents passing and your wife's illness. I hope she has a speedy recovery.

Pypes now says that the SFM04 exhaust (2.5" mandrel bent stainless) will fit staggered shocks. They must have made a change in it, they used to say it wouldn't fit staggered shocks...

If you're interested in knowing more about the various codes and casting numbers that Ford uses you'll find a compilation of code numbers in spreadsheets here: https://7173mustangs.com/threads/ford-code-numbers.33536/ The buck tags are found on the radiator support, usually on the passenger...

After a lot of research and head scratching, I decided to use Comp Cams 26056 beehive springs for my upcoming 408 build. The fit is good, closed pressure will be about 155 pounds and open will be about 400 pounds. Plenty good enough for the Howards cam (231175-12) I will be using.

It's fairly easy to determine which side of the socket is the negative. The light (postive) trace pretty much runs around the outside of the circuit board, with the negative trace the second one in from the outside. You can see the layout in this post...

Very nice, thanks for sharing

Here's a decent article on how to use a multimeter: https://www.msn.com/en-us/money/other/how-to-use-a-multimeter-when-working-on-your-car-a-beginner-s-guide/ar-BB1hr4cj?ocid=msedgntp&pc=U531&cvid=66929f1371df4ae69ef43bb799278dc0&ei=160

Another possibility is that the outer ring on the balancer has slipped around, due to the rubber between the ring and hub drying out and disintegrating. The timing marks are usually just etched into the metal, not just painted on. The etched marks can be difficult to see, and usually need to be...

What method did you use to determine that you are at TDC? Double check the firing order: 1-5-4-2-6-3-7-8 counterclockwise. The big block (385 series) firing order is different that the 351C and W and EFI small blocks. Point ignition? Make sure the condenser is installed correctly and...

I know your pain, it seems like every time I've had to change an in-the-tank fuel pump I had to drop the tank, no access from above. Good to hear you got it trouble shot before you pulled the bed to get access. I'm a real proponent of checking the easy stuff first. And yes, I did have to learn...

In that case, it's also possible it has the incorrect balance on the flywheel/flexplate, or a problem with the clutch disk or torque converter. It could also have loose or missing bolts on them.

Has the vibration always been there, since you had the car, or did it start all of a sudden?

This made it to the news: https://www.msn.com/en-us/news/world/big-name-distributor-caught-stealing-small-shop-s-part-design-and-selling-it-on-summit/ar-AA1ntqc2?ocid=msedgntp&pc=U531&cvid=e62dd8f5d77f4517a836a753637efec1&ei=14