What jets should I use?
- Thread starter Sinister.
- Start date
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Judge Mills
1971 Plymouth Duster
gas mileage and V8 don't mix 
ramcharger
Dismember
I'd start with 68's in the primaries and work from there.
mullinax95
Well-Known Member
The stock suppose to be 64 and you have a plate(not jets) in the back which is 39.
I say 64 for gas mileage if it isn't running lean.
I say 64 for gas mileage if it isn't running lean.
ramcharger
Dismember
IMHO, that cam is too big for that intake manifold. That intake has super small runners. Either switch it out for a weiand action + or an eddy performer, or move down to a cam in the mid to low 250 degree advertised range.
goldduster360
Well-Known Member
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I have never noticed much difference in mileage by running lean. When you do run lean you will have to back off the spark advance and possibly slow down the spark curve to avoid detonation(spark knock). Ratarding timing is not much of an economy move. An adjustable spark advance can would be helpful when staying out of the fat side on the fuel curve.
If you want to play with it, I would move down in 2 jet size increments until it starts surging at a steady speed than go up one jet size and see what happens. Try reading the plugs after each tune too.
Usually there is a pretty fine line between economy and performance when dialing in the engine for street use anyway.
If you want to play with it, I would move down in 2 jet size increments until it starts surging at a steady speed than go up one jet size and see what happens. Try reading the plugs after each tune too.
Usually there is a pretty fine line between economy and performance when dialing in the engine for street use anyway.
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