Correct Timing
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Joined: Dec 2003
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Correct Timing
I have a 83 F-150 with a 300 six engine. It has one hundred thousand on the odomotor and just got the engine rebuilt. The machinist said he didn't pay any attention to the specs in the motor manual but it is only getting about ten miles a gallon. What is the correct timing for my engine? Thinking it should get closer to fifteen to eighteen miles per gallon. What say you!
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Joined: Dec 2004
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From: Connecticut
4.9's varied for 1983, by carb model number.
Carb # btdc Fast Idle rpm Curb Idle
3-51D-R00 6º 1600 700 ac off
3-51E-R01 6º 1600 700 ac off
5-77-R01 10º 1500 600 manual tranny
5-77-R01 10º 1500 600 manual tranny
9-77S-R10 10º 1600 700
9-77J-R12 12º 1600 700
9-78J-R00 12º 1600 550
9-78J-R11 12º 1600 550
Plug gap .042-.046
Carb # btdc Fast Idle rpm Curb Idle
3-51D-R00 6º 1600 700 ac off
3-51E-R01 6º 1600 700 ac off
5-77-R01 10º 1500 600 manual tranny
5-77-R01 10º 1500 600 manual tranny
9-77S-R10 10º 1600 700
9-77J-R12 12º 1600 700
9-78J-R00 12º 1600 550
9-78J-R11 12º 1600 550
Plug gap .042-.046
