Is a 12 second, 20+mpg slant six possible?

Post from Lou Madson (dart270 on slantsix.org)


Well, yesterday I was looking at my throttle body on the 68 Dart turbo car, in preparation for installing a bigger one, and found that a plug I had put in there 4 yrs ago in one of the IAC holes (5/8"!) had blown/fallen out! Who knows how long it's been gone? OOPS. I can almost imagine when it fell out, because I felt the old turbo was not spooling up as fast, and that is why I bought this new smaller turbo -1.5 - 2 yrs ago??

After test drive: Wow, the Dart is a different car after I plugged that hole. Hard it see it won't get me another 0.2-0.3 sec. Boost response is much improved. Instead of 2-3 sec for boost to come up, now it is 0.5 sec or so.

Note to self: Inspect for air leaks once in a while. Live and learn.

I also reinstalled my rear seat and put a little dynamat in places behind it on the firewall. It did quiet the car down a bit, which is nice...

Update from 2 wks ago: Slant Six race in Hagerstown, MD on Oct 9...
After installing my re-stalled R&R converter (now 2400, originally 2000-2100, desired 2800!) the car ran a few 13.38s (and up) at 103-105 MPH. Very happy, although I thought I might go a little faster than that. The drive up and back sure was nice too.

Final comment: I was thinking I might build a new short block for this car over the winter, but I have decided to leave the old engine in there (175k miles) and focus on other projects this winter. We'll see if I can get into the 12s with the old motor next year...

Slant on,

I don't know the exact numbers, but this car gets over 20 mpg