The Stovebolt Site Forums The Shop Area Engine Shop Electronic Ignition, is it Really of any value????

I can say from actual personal experience that a GM HEI will give better fuel mileage on a stone stock 78k mile '64 C10 running a 230/3 speed than a properly tuned points setup. I got close to 1 MPG improvement. I did regap the (same)plugs to .045 & was able to lean the idle out & still get it smooth. Old truck got 15 MPG consistently, HEI got it up to 15.9. I never tried any high dollar plugs-I use basic Autolites.

I know the 230 is not the same design as a 235, I know the newer dizzy prolly had a different curve(was robbed from 75 C10). I feel the leaner idle had much to do w/the mileage improvement. This was averaged over several tanks, same pump used always, odo was checked against GPS & found to be spot on.