1970 Dodge Dart - Vintage car valve seats?

dodge

#1

How do you know if your vintage car needs valve seats?


#2

Brand spanking new or vintage car; the procedure for diagnosing bad valve seats is the same.

You run a dry and then wet compression test on all cylinders. If both the wet and dry test shows low compression in that cylinder, the valve seats are likely not sealing.

A leakdown test will also show bad valve seats but you need to listen at the exhaust and intake for the “hiss” of leaking valves.


#3

If your engine is running smoothly and easy to start, you don’t need valve seats. If you are worried about unleaded gas, I used to run Amoco High Test unleaded in the 60s all the time and it had no lead. There are also lead substitutes in a bottle. Unless you are using this as a daily driver I wouldn’t worry about it.


#4

Thanks, I think I am good. The old Dart Swinger was turning a 14.85 in the quarter last time I had it to Cecil County Dragway. She’s fun in the quarter mile, but with no roll bars is more than a handful in the corners when driving any distance. Really considering adding them just to make it safer and more pleasurable to drive.


#5

I don’t know if they’re still available, but I added a front aftermarket anti-roll bar to my '72 Duster years ago.


#6

Turns out Summit has Addco kits (along with other brands) for your Dart. I’m pretty sure it was an Addco that I put on my Duster.


#7

Thanks, I’ll look into it. It just feels like it wants to roll over onto its nose if you take a corner to quickly. It has no sway bars, no power steering or brakes, but it has the one year only four piston front disk brakes and drum rear brakes. It’s a 340 cu. in., 4 speed car. I had a '71 Duster with a slant six back in the day. I was looking for a Duster when I found the '70 Dart. What does your Duster have?


#8

I would do a rear sway bar kit too. Addco shows a kit for your Dart, but lists it as out of stock.


#9

Oh, it’s long gone. I had it in high school, through college, then sold it a year after I started work. It had the smokin’ 198 CID slant 6 and a 3 on the floor. Slow but sturdy, I pulled a small U-Haul with it from TX to CA and back.


#10

I thought that the front stabilizer bar was standard equipment on 340 cars, do your lower control arms have the mounts for the stabilizer links? The 6 cylinder cars didn’t have the mounts on the lower control arms for the stabilizer bar but those are included in the Addco kit.