Into the weeds engine design for fuel efficiency discussion.

My recipe which I have most of the parts for:

1967 closed chamber 273 heads on a 69 318, to raise compression

Doug's D453 headers 1 5/8 tubes

Edelbrock Streetmaster 318, designed for economy and torque,
from idle to 4500

400 cfm AFB or a Thermoquad

Custom ground cam for high vacuum and economy

MP dizzy with adjustable vacuum canister

MSD 6AL and MSD 8680, dash controlled timing

Aluminum 833 overdrive 4 speed with OD .72 ratio combined with a
2.94 8 3/4 axle should give about
2.20 axle ratio, If I can get some 2.76's it would go down to 2.00 !!


IF gas gets crazy $, I'll be putting it together, or if my son stays in Colorado, it would be a great interstate cruiser to get out there