beatngu Posted October 24, 2007 Share Posted October 24, 2007 I have been told that the 401 gas get's around 8 MPG, and I would like to know what newer engines would fit in it. I am aiming for better gas milage, and my pick-up has a 360 that I could rebuilt if the bolting pattern matches. The truck does not really need a lot of horsepower seem's how it has a 20 speed transmission and 8.15's right? Quote Link to comment Share on other sites More sharing options...
ThaddeusW Posted October 29, 2007 Share Posted October 29, 2007 My GMC 6000 with a 170HP 350 gasser gets about 5-6 MPG. I bet with some more oomph and a newer engine you could get past 8 mpg. The good news is that Mack did use Chrysler engines. But I don't know if you can still easily find the parts. The R400 was offered with a Chrysler as well as some B models to replace the flathead v8's. Quote -Thad What America needs is less bull and more Bulldog! Link to comment Share on other sites More sharing options...
beatngu Posted October 30, 2007 Author Share Posted October 30, 2007 I might just get another 401 to replace it, but would there be anything that I could do to improve milage? I figure putting a new exhaust on it (from headers to tailpipe) would help slightly. Quote Link to comment Share on other sites More sharing options...
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