CK5
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1973 C10 "The Purple Truck"

Basic build
It's 3 seconds and I just did it on a whim. You can loop it to get the full effect. :p:
 
Yeah I figure compared to a lot of stuff on the road now these trucks don't have much light output.

The 66 is worse but I haven't decided if I want to go LED on it. The do make similar LED taillights for it.

The only lights on the 73 I can't find LED for are the marker lights under the headlights. I tried an LED bulb there but they wouldn't flash when the headlights were on.
 
Sounds like you need NON-polarity sensitive bulbs like I had to in 81-up side markers . Try checking superbrightled web site .
 
Okay, better video


And this shows an odd camera affect. The taillights are on and it looks like they are flashing but they are not.


When I first set up the phone I kept looking at the screen - they're flashing, look at the truck - no they're not.

After some reading it seems to be something with the refresh rate of the LED drivers and the shutter speed.
 
I've never appreciated the tunability of the metering rod style carbs. As document previously in the thread, I've played around with a few rod sizes and jets. Here's my log I'm keeping on the box:
2019-04-23 15.34.08.jpg

I had been running the largest rods I have (meaning leanest) hoping to optimize fuel mileage. I could tell they were a touch too lean because I would get some hesitation holding certain speeds and also a little surging. MPG have been right around 12.25, this is mixed driving. I have gotten about 13.5 on a tank of all highway.

Monday I stepped back one size smaller on the rods so it's running a little richer. It made for quite an improvement in performance. I ran a tank thru making deliveries. It was mostly highway but some of it was interstate driving 75mph which is not the most efficient for these squarebodies and it got 14mpg. That tells me that at the very least I'm getting better MPG with improved performance.

And since I hate posting without pictures, this is how a rod change works.

2016-01-08_11-22-16.jpg

Loosen the screw enough to rotate the cover out of the way and pull the piston and rod out. The other side not highlighted above is a step more difficult because you have to move the choke linkage out of the way by pulling one of the e-clips.

images.jpg

StDemonMeteringRod.jpg

The rod just hangs from the piston. I haven't messed with changing the springs.

And an infographic for the nerds like me. :D

2016-01-08_11-22-04.jpg
 
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It's a Holley Street Demon. People compare it to the old Carter AFB.
 
And correction on the MPG with the richer jets. I was guessing earlier but I just filled up and I got 14mpg! Super happy with that.

Sucks having just 1 20gal tank tho. I drive about 250 miles a week so I'm frequently filling up.
 
And correction on the MPG with the richer jets. I was guessing earlier but I just filled up and I got 14mpg! Super happy with that.

Sucks having just 1 20gal tank tho. I drive about 250 miles a week so I'm frequently filling up.
My '81 C30 2wd 454 dually crew cab also has a single 20 gal tank, I feel your pain. I don't drive mine as far as you though.
 
I learned something interesting about how we squarebody fans can't always assume things will interchange.

I have one of the tailgate supports that messed up.

View attachment 300786

The "rivet" for lack of a better word, that's supposed to hold the 2 pieces together has flat spots so it likes to come apart. I don't know if the previous owner did this on purpose or if it was some sort of damage. For reference, this is how it's supposed to look.

View attachment 300787

A couple months ago I pulled one off a truck in the junkyard. When I installed it in the truck I could not get it to allow the tailgate to close. I finally figured out the lower piece connected to the tailgate is almost 1" shorter on the 73 than the one I pulled.

I was back in the junkyard so I started looking closer at tailgates. There weren't any like the 73, but I figured out another difference when I looked at the 73 tailgate again. The big difference I noticed is the stud on the tailgate that the support slots into is integrated with the piece bolted around the latch. In the picture below you can see a bolt head on either side of the latch and the stud for the support below that.

View attachment 300789

On the newer tailgates the metal piece bolted around the latch is longer and the stud for the support strap is attached to that and not directly to the tailgate. This change must have meant a change in the lengths of the support. So I'm curious now how many years were done like the 73 before they switched. I might have to see if I can swap over that piece bolted around the latch.
I did see that LMC sells replacement tailgate supports. They call these "1st version" for 73-76.
 
Interesting, always good to have another place to look for stuff. It amazes me how many places sell restoration parts these days.
 
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