M-Block 351M/400 Performance

M-block Timing Specifications

Copyright 2002-2003 Dave Resch
All rights reserved.


The following tables list ignition timing specifications for various 1977 to 1982 M-block truck engine applications.

1977 M-Block Ignition Timing Specifications

Model

Application

Initial Timing

F100

351M, auto trans, high-alt
351M, manual trans, exc. high-alt

10 BTDC

F100

351M, auto trans, CA emissions

8 BTDC

F100

400, auto trans

6 BTDC

F150/250/350

351M, manual trans

12 BTDC

F150/250/350

400, auto/manual trans

12 BTDC

 

1978 M-Block Ignition Timing Specifications

Model

Application

Initial Timing

Bronco

351M, auto trans

14 BTDC

Bronco

351M, auto trans, CA emissions

8 BTDC

Bronco

351M, manual trans, CA and 49-state

6 BTDC

Bronco

400, auto/manual trans

12 BTDC

F100

351M, auto trans

10 BTDC

F100

351M, auto trans, CA emissions
351M, manual trans

8 BTDC

F100

351M, auto trans, high-alt

14 BTDC

F100

351M, manual trans, CA emissions
400, auto trans

6 BTDC

F150/250/350

351M, auto trans

14 BTDC

F150/250/350

351M, auto trans, CA emissions

8 BTDC

F150/250/350

351M, manual trans, CA and 49-state

6 BTDC

F150/250/350

400, auto/manual trans

12 BTDC

 

1979 M-Block Ignition Timing Specifications

Model

Application

Initial Timing

Bronco, F100/150/250/350

351M, auto trans, 49-state
400, auto trans

6 BTDC

Bronco, F100/150/250/350

351M, manual trans, 49-state
400, manual trans

10 BTDC

Bronco, F100/150/250/350

400, auto trans, high-alt

12 BTDC

 

1980 M-Block Ignition Timing Specifications

Model

Application

Initial Timing

Bronco

351M, auto trans, 49-state

6 BTDC

Bronco

351M, manual trans, 49-state

10 BTDC

F150/250LD

351M, auto trans, 49-state
400, auto trans, CA emissions

6 BTDC

F150/250LD

351M, manual trans, 49-state

10 BTDC

F150/250LD

400, auto trans, 49-state

4 BTDC

F250HD/350

400, auto trans, 49-state

3 BTDC

F250HD/350

400, auto trans, CA emissions
400, manual trans, 49-state

6 BTDC

 

1981 M-Block Ignition Timing Specifications

Model

Application

Initial Timing

F150/250/350

351M, auto trans
400, auto/manual trans

6 BTDC

F150/250/350

351M, manual trans

10 BTDC

 

1982 M-Block Ignition Timing Specifications

Model

Application

Initial Timing

F250HD/350

351M, auto trans
400, auto/manual trans

6 BTDC

F250HD/350

351M, manual trans

10 BTDC

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