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Slant Six 2bbl Milage
#157433
11/26/08 06:53 PM
11/26/08 06:53 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
OP
super stock
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OP
super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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My 74 Duster with a 225 Slant has a two barrel intake and two barrel Holley off of a 318. It runs smooth. It usually gets 15-17 mpg on the hwy and 11-13 in the city. It has some miles on it and the valve seals may be needing to be replaced, but it runs smooth on all 6. The gearing is 2.76 behind a 904. Does this milage sound reasonable for a setup like this, or should it be a tad better? The valve lash seems alright, as there is no valvetrain noise. The exhaust manifold leaks a bit, as the idiot who had it prior to me did not put much of a gasket on, mostly RTV(  ). I am going to fix that this weekend.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: Slant Six 2bbl Milage
[Re: DaytonaTurbo]
#157435
11/26/08 07:22 PM
11/26/08 07:22 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
OP
super stock
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OP
super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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I am beginning to think that the 318 carb is jetted too rich. The hwy milage may approach 20 at times, but the city is consistant 11-13.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: Slant Six 2bbl Milage
[Re: MoparJ]
#157437
11/26/08 07:42 PM
11/26/08 07:42 PM
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Joined: Oct 2005
Posts: 9,065
Milwaukee, WI
In_The_Pink
master
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master
Joined: Oct 2005
Posts: 9,065
Milwaukee, WI
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Quote:
My 74 Duster with a 225 Slant has a two barrel intake and two barrel Holley off of a 318. It runs smooth. It usually gets 15-17 mpg on the hwy and 11-13 in the city. It has some miles on it and the valve seals may be needing to be replaced, but it runs smooth on all 6. The gearing is 2.76 behind a 904. Does this milage sound reasonable for a setup like this, or should it be a tad better? The valve lash seems alright, as there is no valvetrain noise. The exhaust manifold leaks a bit, as the idiot who had it prior to me did not put much of a gasket on, mostly RTV( ). I am going to fix that this weekend.
It think those are typical numbers, and about what I get with my '77 Aspen wagon w/Super Six during normal driving. 
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Re: Slant Six 2bbl Milage
[Re: 2Bad360sfromNC]
#157439
11/26/08 09:07 PM
11/26/08 09:07 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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whats hurting you the most is the 2.76 rear. With the low torque of the /6 & 74 A is heavy it makes you go too deep into the throttle. If you run into a good deal on a 3.23 rear in the bolt pattern you have(BBP I assume) which would probably be rare(in that ratio) You would gain alot. Or a set of dutra duals to attack the worst(restricted) area on the eng.
live every 24 hour block of time like it's your last day on earth
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Re: Slant Six 2bbl Milage
[Re: Rug_Trucker]
#157441
11/26/08 11:32 PM
11/26/08 11:32 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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A 3.23 in a sbp would be alot easier to come by. I just tossed several 7&1/4's because I got tired of tripping over them then I see 2 people who want them. ain't that how it always goes.
live every 24 hour block of time like it's your last day on earth
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Re: Slant Six 2bbl Milage
[Re: Magnumguy]
#157446
11/27/08 03:14 PM
11/27/08 03:14 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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3.23's would be perfect around town but would be terrible on an interstate trip. If your not a traveling salesman most people are going to be mostly going stoplight to stoplight.
live every 24 hour block of time like it's your last day on earth
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Re: Slant Six 2bbl Milage
[Re: MoparJ]
#157447
11/27/08 05:45 PM
11/27/08 05:45 PM
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Joined: Feb 2003
Posts: 8,020
Pangaea
B5 Bee
master
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master
Joined: Feb 2003
Posts: 8,020
Pangaea
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'84 D100, 833OD, 225 with 2bbl added, gets 20mpg HWY at 65mph. Only got 18mpg with the original 3.21 gear and a 235x15 tire, 20mpg came with a swap to an older 8.75 rear with 3.91SG.
'79 Aspen, 904 LU, 225 Super Six, don't know the gear, gets 24mpg HWY at 65mph.
'68 Signet, 904, 225 with 2 bbl added, header, don't know gear, still has 13" tires, gets 19-20mpg CITY driving it easy.
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Re: Slant Six 2bbl Milage
[Re: 70Valiant]
#157450
12/03/08 04:45 PM
12/03/08 04:45 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
OP
super stock
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OP
super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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The motor is definately on the loser side; it does not knock, but the valve seals are worn and it sounds loose when it is being shut down. My nose can pick out the scent of some blowby.
The chain probably is going south. The carb is a Holley 2bbl of a stock 75 318 dart. It is an OE piece. The exhaust is 2" from the manifold, through a Flowmaster muffler (does not sound great on a slant).
I dont think the lash is too far off and I have timing at a good setting, which would be as aggressive as I can go before detonation sets in.
The rear tires are 215/70/14s.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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