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Re: 318 gas milage build?
[Re: RapidusMaximus]
#1670263
09/25/14 02:30 PM
09/25/14 02:30 PM
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Joined: Mar 2005
Posts: 792 Earth
Rob C
super stock
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super stock
Joined: Mar 2005
Posts: 792
Earth
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Quote:
Just bought my son a 77 SWB with a 360 auto, carter afb, duel plane 4bbl intake, stock exhaust, stock rear with 2.73 one legger, it is a gas hog (about 10 mpg or less)...considering pulling the 360 and installing a 318. Any suggestions on a gas miserly 318 build? 2bbl/4bbl, cams, induction preference? Or....is there any way to improve the milage of this 360? Thanks
The hardest part if mileage is the vehicle itself. Being a huge brick moving through the air is a problem in itself. Things I did for improved mileage to 20 MPG's in my '79 3700lbs. 360 powered Magnum were;
Open air cleaner 625 Carter well jetted, slightly lean A stock intake was used but a RPM would be better once under power going down the road. While I used stock heads, a rebuilt set with a good valve job to improve low lift flow would help here. I used dual exhaust of the manifolds @ 2-1/4 inch pipe with an "H" connection into a set of Thrush mufflers. A junk yard distributor w/vacuum advance (since in 1979 the vacuum advance was on the leanburn computer) and a MSD fired it all off. The trans was a 904 & the rear was a 8-1/4 w/2.76 gears and 235/60/15 tires on all 4 corners.
Being a low powered emmision year engine saddled with lots of equipment, which was removed, I'm not sure if headers would help much or a larger exhaust pipe would help. More compression would increase power and mileage but I never milled my heads.
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