Join Date: Nov 1999
Location: colorado springs co
i have been battling bad milage all winter also. I dont have a much for economy (street built 350 in a 81 f-bird)and was getting about 8 mgp in the city, 16 high way And have got a few good results.
heres what i did.....
Bought a new hei, recurved with the lighest springs, accel coil and cap
Rebuilt my performer carb and used the proper jets and metering rods for 6000 ft alt where i live. I found the info at the edelbrock web site.
put in a posi 3.42 10 bolt z-rear end, i was running 2.72? highway gears that were unbearable, since I do 90% of my driving in the city this HELPED ALOT. i seem to get about the same milage when i get on it hard as when i go easy,and my secondaries work much beter.
i went with a RPM cluch fan in place in place of my old cheepo flex fan. I seen in car craft test that it would free up around 20 hp at idle and 40 at 5500rpm (only 2hp less than a electric and much cheeper). and since i have a new 4 core radiator and live in the mountians it never has never got over the 185" mark.
now i get about 15 mpg consistantly(and i drive it like i stole it.) in the city and highway .Its also much faster iam going to rebuild the exhaust next.
[This message has been edited by will stefan (edited 04-30-2000).]