15.0 mpg to 21.6 mpg!

spl440 said
View attachment 1715095631You can use DIY cowl induction. Also try one of the smaller Thermoquads. small primaries with large secondaries. Best of both worlds. mileage and performance.

What kind of numbers? My 273 4 speed gets right at 20 hwy. if I drive it like a grandpa. I have a o/d 833 that could improve things.