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M-Block 351M/400 Performance
M-block Timing
Specifications
Copyright © 2002-2003 Dave Resch
All rights reserved.
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The following tables list ignition timing specifications for
various
1977 to 1982 M-block truck engine applications.
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1977 M-Block Ignition Timing
Specifications
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Model
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Application
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Initial Timing
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F100
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351M, auto trans, high-alt
351M, manual trans, exc. high-alt
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10° BTDC
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F100
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351M, auto trans, CA emissions
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8° BTDC
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F100
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400, auto trans
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6° BTDC
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F150/250/350
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351M, manual trans
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12° BTDC
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F150/250/350
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400, auto/manual trans
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12° BTDC
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1978 M-Block Ignition Timing
Specifications
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Model
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Application
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Initial Timing
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Bronco
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351M, auto trans
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14° BTDC
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Bronco
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351M, auto trans, CA emissions
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8° BTDC
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Bronco
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351M, manual trans, CA and 49-state
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6° BTDC
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Bronco
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400, auto/manual trans
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12° BTDC
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F100
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351M, auto trans
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10° BTDC
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F100
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351M, auto trans, CA emissions
351M, manual trans
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8° BTDC
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F100
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351M, auto trans, high-alt
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14° BTDC
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F100
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351M, manual trans, CA emissions
400, auto trans
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6° BTDC
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F150/250/350
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351M, auto trans
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14° BTDC
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F150/250/350
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351M, auto trans, CA emissions
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8° BTDC
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F150/250/350
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351M, manual trans, CA and 49-state
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6° BTDC
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F150/250/350
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400, auto/manual trans
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12° BTDC
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1979 M-Block Ignition Timing
Specifications
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Model
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Application
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Initial Timing
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Bronco, F100/150/250/350
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351M, auto trans, 49-state
400, auto trans
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6° BTDC
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Bronco, F100/150/250/350
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351M, manual trans, 49-state
400, manual trans
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10° BTDC
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Bronco, F100/150/250/350
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400, auto trans, high-alt
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12° BTDC
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1980 M-Block Ignition Timing
Specifications
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Model
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Application
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Initial Timing
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Bronco
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351M, auto trans, 49-state
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6° BTDC
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Bronco
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351M, manual trans, 49-state
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10° BTDC
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F150/250LD
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351M, auto trans, 49-state
400, auto trans, CA emissions
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6° BTDC
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F150/250LD
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351M, manual trans, 49-state
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10° BTDC
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F150/250LD
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400, auto trans, 49-state
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4° BTDC
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F250HD/350
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400, auto trans, 49-state
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3° BTDC
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F250HD/350
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400, auto trans, CA emissions
400, manual trans, 49-state
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6° BTDC
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1981 M-Block Ignition Timing
Specifications
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Model
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Application
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Initial Timing
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F150/250/350
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351M, auto trans
400, auto/manual trans
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6° BTDC
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F150/250/350
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351M, manual trans
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10° BTDC
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1982 M-Block Ignition Timing
Specifications
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Model
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Application
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Initial Timing
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F250HD/350
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351M, auto trans
400, auto/manual trans
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6° BTDC
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F250HD/350
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351M, manual trans
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10° BTDC
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