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Topic Review (Newest First)
10-19-2015 08:56 PM
JohnTN This is a 3 year old thread.
10-19-2015 05:00 PM
oldbogie
Quote:
Originally Posted by 305edelbrock View Post
i have a stock small block 305 with a 600 cfm edelbrock carb i need help trying to figure out how to get better4 feul millage the most i can get is 11.5 miles to a gallon which i have been told by others is 1.5 miles more then a 305 should get if any one has any idea's or can help let me know
What vehicle, transmisison, gearing and tire size are pretty important pieces of information when fuel mileage has to be addressed. An important element is how much weight, how fast does it turn at road speed, what kind of terran and altitude are all contributors that affect part selection and tuning of thing's like carburetors.

Bogie
10-19-2015 12:21 PM
cerial Tuning(happy engine happy driver)
Weight(mostly unnecessary ie half a tank)
Aero(if your driving a bread truck I got bad news)
Efficient power for demand(changes that will increase mileage without hurting performance)
Drive train resistance(replacing parts that cause drag with better ones)

In that order to increase your mileage on anything. You are at the 1st step.

Make sure everything is running properly. Install a air fuel bung and make sure your not running to rich. The most important thing with mileage is Tuning. Once that is done you can play around with weight.

I gave up on mileage years ago. I drive my single digits when I want to have fun and kick around in some kind of puddle jumper the rest of the time. I average around 20mpg between the two driving both like I have egg yokes on the floor.
10-19-2015 01:00 AM
handy7rick
Quote:
Originally Posted by 305edelbrock View Post
i have a stock small block 305 with a 600 cfm edelbrock carb i need help trying to figure out how to get better4 feul millage the most i can get is 11.5 miles to a gallon which i have been told by others is 1.5 miles more then a 305 should get if any one has any idea's or can help let me know
Also , to add to what I already posted; as others hav said Many other factors are to be considered.One other very notable is Ignition timing.If you can run without any kind of auto advance, vacuum or otherwise,I'd set it at 34 degrees all the time. Make sure no spark knock! Shouldn't have that problem with the low compression ( but I don't know all your set up.Make sure those spark plugs are burning clean and dry (white ish) not too blue ish either.Good luck,Let me know if you try these suggestions and the out come please!) Good motoring and mileage! Handy7rick.
10-19-2015 12:49 AM
handy7rick
Quote:
Originally Posted by 305edelbrock View Post
i have a stock small block 305 with a 600 cfm edelbrock carb i need help trying to figure out how to get better4 feul millage the most i can get is 11.5 miles to a gallon which i have been told by others is 1.5 miles more then a 305 should get if any one has any idea's or can help let me know
First off, what's your final gear ratio? Which trans do you have ;Overdrive ? If its Stock, With the right gears and Trans I (personally ) believe at least 15 mpg city and at least 20 Highway is totally attainable. The 305's I've seen had open chambers 70+cc, with small intake and small exhaust valves,(Good for low end torque and Mileage),although some 305's have flat top Pistons (usually Montecarlo's or any High Out put 305's) Eithr one takes Regular unleaded and get good mileage WITH the right final gear ratios and the Overdrive trans.(I personally prefer The 200 metric , which swaps right in place of a Turbo 350. They are harder to find(Very durable) otherwise I'd us the 1990s year model 4L60 non electronic and use a toggle switch or similar to engage the lock out(lowers RPM ANOTHER 200- 300 after 4 th gear.) I have the Sam set up behind my 383 sbc stroker and it works great in my 1984 El Camino with 373 posi gears.Turns about 2500rpm @70mph.
10-18-2015 05:27 PM
st3gamefarm +1 to what's been said above.
Th' Ol ladys gut stock origional heavy *** '85 Pontiac Parisienne gets better than that wit' a 305, and 380000 miles on it. ('bout 30000 since overhaul)
It gets about 23 highway, and about 12-15 'round town.
10-18-2015 05:23 PM
st3gamefarm
Quote:
Originally Posted by bullheimer View Post
try 7 mpg....HIGHWAY!!!
I gotcha beat! I get 8mpg in my pickup.
10-18-2015 04:14 AM
handy7rick
Quote:
Originally Posted by 305edelbrock View Post
i have a stock small block 305 with a 600 cfm edelbrock carb i need help trying to figure out how to get better4 feul millage the most i can get is 11.5 miles to a gallon which i have been told by others is 1.5 miles more then a 305 should get if any one has any idea's or can help let me know
What's your final gear drive ratio and which Trans are you using? I've found 4L60 non electronic overdrive (1990's) and A Good 1970's Rochecter Quadrajet (set up properly ) is the best recipe for Good or Better Mileage.Performs Great also if you know Quads well enough.Ive used them for years when others called them"Quadrajunk". Till I drove my Quad carbed small block Chevy Around them.
06-26-2012 07:59 AM
boatbob2
Milage.........

What is the rear end ratio?? will have a LOT to do with milage....
06-25-2012 04:29 PM
1971BB427 What tranny? Best thing you could do to improve mileage is an overdrive tranny. If it's a 3 speed auto, then find a 700R4 or 2004R and instll it. You'll get much better mileage on the highway.
06-23-2012 06:48 PM
LATECH
Quote:
Originally Posted by RWENUTS
You forgot the EGG!!!
Drive like you've got an egg under the gas pedal!!!
X2 driving habits are the biggest thing when it comes to mileage.
Also condition of tune, plugs and timing, very critical
The carb, meh ... put a well tuned Small quadrajet non electronic carb on it.
Be sure you have a non computer distributor on it.

Your mileage will go up.some.
How many miles was a good question, a good tune cant help an engine with excess blow buy at the rings. To much is lost right there.
Need to do some preliminary checking on the situation. Dont just throw parts at it . Learn how to ID a problem and how to do basic tune up work.
Check it out first.
What kind of distributor does it have? Does the engine smoke?Does it have plenty of power as it is right now?
06-23-2012 05:55 PM
RWENUTS
Quote:
Originally Posted by krypty
a 2v intake and carb, high performance ignition, free flow intake filter, new cat converter, headers, properly inflated tires, port work on exhaust, synthetic fluids..... all i could think of lol
You forgot the EGG!!!
Drive like you've got an egg under the gas pedal!!!
06-23-2012 04:28 PM
bullheimer try 7 mpg....HIGHWAY!!!
06-23-2012 02:04 PM
cool rockin daddy Except what vehicle it's in.
06-23-2012 01:32 PM
krypty a 2v intake and carb, high performance ignition, free flow intake filter, new cat converter, headers, properly inflated tires, port work on exhaust, synthetic fluids..... all i could think of lol
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