A Newbie to Dodge/Mopar
#31
#32
If I could get that carb to behave a little better on hills it would be perfect. I haven't ever messed with it except to clean in though...
#33
then Holley must be wrong then. there carb selector said there 390cfm carb would be perfect for my 81 318. you would almost have to have a redline of 6000rpm to even justify having a 570cfm carb. i have one and only average 10mpg. the with 4x4 and a 500cfm carb on a 360 is getting 14mpg.
http://www.holley.com/data/TechServi...Carburetor.pdf
http://www.holley.com/data/TechServi...Carburetor.pdf
I took the OP's comments to mean he wanted to make more horsepower so my advice was based on that.
Curious to know what kind of carb's are on the 2 trucks you described. My 85 4x4 still has the factory 4 bbl rochester carb and gets over 14 mpg carrying a thousand pound camper
#34
#35
Holley's selector also i believe asked about intended usage of the vehicle, if your primary concern is gas mileage you might want a small carb, in fact you might be better off going to a 2 bbl setup, or staying with a rochester, on a 4x4 vehicle thats used mainly offroad a 470 truck avenger carb might be a good bet.
I get much better mileage with my 4bbl than i did with the 2bbl. I have always heard that the right 4bbl will get better than a 2, due to having smaller primaries, and larger secondaries to use when needed, while the 2bbl has to make do with just 2 jets that have to support it while cruising as well as when floored.
Last edited by Wombat Ranger; 06-21-2012 at 09:22 AM.
#36
Crazywofie...holleys are notorious for not being very fuel efficient, I don't know too much about that particular model but was under the impression that if it was jetted and tuned right it could get pretty decent mileage
2x72 what u say might very well be true, I haven't ever run a 2bbl, but spread bore 4 barrels probably get better mileage than square bore models, because of what u described
my truck has a 360 in it and someday its gonna get a 570 avenger
2x72 what u say might very well be true, I haven't ever run a 2bbl, but spread bore 4 barrels probably get better mileage than square bore models, because of what u described
my truck has a 360 in it and someday its gonna get a 570 avenger