Low compression on the 360 when compared to the 340's is the culprit.

I have a 360 with 9.5:1 and a 750 3310 Holley. It's as efficent as you're gonna get in a 5,600 lbs. Powerwagon with full time 4wd. It does get better mileage than the 318 2 bbl. it replaced.

11 mpg average for the 360 and 9 mpg average for the 318 with LOTS more grunt and towing capability.

Last edited by GY3; 05/19/14 06:46 PM.