How I lost 3 miles per gallon

[mikep]

I pulled the 750 edelbrock off my boat the other day and replaced the quad on my 350 just to see what would happen. Gained about 20 HP in the process but my mileage went to hell in a handbasket. It may just be because I am enjoying the 20 horsepower a bit too much. After I get tired of full throttle 0-70 blasts I'll have to see what the real mileage difference is. The quadrajet was a good fresh carb but its amazing what a difference installing a different carb will make.

On a related note I pulled the 750 edelbrock off my brothers 390 powered 68 cougar and installed a new 600 cfm holley as it had backfired pretty bad once after sitting 4 years not running and it bent the throttle plates and choke plate ( also ballooned the valve covers and blew the air cleaner and breathers clean off the motor ). Runs great with the holley I must say.