360 fuel mixture
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Joined: May 2000
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360 fuel mixture
I have a 1969 Ford F-350 used for towing.
It has a stock 4 barrel intake off a 390,
and a Holley 600 cfm vacuum secondary carb.
headers, K&N filter, stock cam. The gear ratio
is 4.56 and I run 16" tires, 4 speed. The problem
is that the back 2 cylinders on both sides
are running lean. The plugs are white to
light grey. The front 2 cylinders on both
sidesare running rich. the plugs are black.
Anyone ever seen this or have a suggestion?
Thanks
Mark
It has a stock 4 barrel intake off a 390,
and a Holley 600 cfm vacuum secondary carb.
headers, K&N filter, stock cam. The gear ratio
is 4.56 and I run 16" tires, 4 speed. The problem
is that the back 2 cylinders on both sides
are running lean. The plugs are white to
light grey. The front 2 cylinders on both
sidesare running rich. the plugs are black.
Anyone ever seen this or have a suggestion?
Thanks
Mark
New User
Joined: May 2000
Posts: 5
Likes: 0
360 fuel mixture
With a vacuum secondarys leaning the froont jets and richening the rear won`t do anything but make it run to lean because the rear barrels only kick in when you punch it. Concetrate on the front barrels only are the mettering screws set equally.
Junior User
Joined: Apr 2000
Posts: 89
Likes: 0
360 fuel mixture
To adjust the idle mixture put a vaccum gauge on the motor and adjust them to read the highesy vaccum as well as watching the idle speed. The other thought is if the jets are plugged on one side.....
Jim
Jim
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Jordanz_03
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Aug 23, 2011 04:37 PM
