MGB Tuning Data
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Point
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Static
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Strob.
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Plug
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Engine
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Intro
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Idle
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Dist.
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Dist.
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Gap
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Timing
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Timing
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Plug
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Gap
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Series
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No.
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Dates
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Market
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RPM
|
Type
|
S/N
|
(In)
|
Deg BTDC
|
Deg BTDC
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Type
|
(In)
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18G (LC)
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May-62
|
ALL
|
500
|
25D4
|
40916
|
.014 to .016
|
8
|
12 @ 600
|
N-9Y
|
.024 to .026
|
|
18G (HC)
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|
May-62
|
ALL
|
500
|
25D4
|
40897
|
.014 to .016
|
10
|
14 @ 600
|
N-9Y
|
.024 to .026
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18GA (LC)
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|
Feb-64
|
ALL
|
500
|
25D4
|
40916
|
.014 to .016
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8
|
12 @ 600
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N-9Y
|
.024 to .026
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18GA (HC)
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|
Feb-64
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ALL
|
500
|
25D4
|
40897
|
.014 to .016
|
10
|
14 @ 600
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N-9Y
|
.024 to .026
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18GB (LC)
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Oct-64
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ALL
|
500
|
25D4
|
40916
|
.014 to .016
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8
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12 @ 600
|
N-9Y
|
.024 to .026
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18GB (HC)
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|
Oct-64
|
ALL
|
500
|
25D4
|
40897
|
.014 to .016
|
10
|
14 @ 600
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N-9Y
|
.024 to .026
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|
18GD (LC)
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|
Nov-67
|
NOT USA
|
500
|
25D4
|
40916
|
.014 to .016
|
8
|
12 @ 600
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N-9Y
|
.024 to .026
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|
18GD (HC)
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|
Nov-67
|
NOT USA
|
500
|
25D4
|
40897
|
.014 to .016
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10
|
14 @ 600
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N-9Y
|
.024 to .026
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18GF
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Oct-67
|
USA
|
900
|
25D4
|
40897
|
.014 to .016
|
10
|
20 @ 1000
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N-9Y
|
.024 to .026
|
|
18GG (LC)
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|
Oct-68
|
NOT NA
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500
|
25D4
|
40916
|
.014 to .016
|
8
|
12 @ 600
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N-9Y
|
.024 to .026
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18GG (HC)
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Oct-68
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NOT NA
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500
|
25D4
|
40897
|
.014 to .016
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10
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14 @ 600
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N-9Y
|
.024 to .026
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18GH
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Oct-68
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NA
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900
|
25D4
|
41155
|
.014 to .016
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10
|
20 @ 1000
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N-9Y
|
.024 to .026
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18GJ
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Oct-69
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CA
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900
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25D4
|
41155
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.014 to .016
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10
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20 @ 1000
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N-9Y
|
.024 to .026
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18GK
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Aug-70
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NA
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900
|
25D4
|
41339
|
.014 to .016
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10
|
15 @ 1500
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N-9Y
|
.024 to .026
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18V
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581-F-H
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Aug-71
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HOME
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750 to 800
|
25D4
|
41288
|
.014 to .016
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10
|
13 @ 600
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N-9Y
|
.024 to .026
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18V
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581-Y-L
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Aug-71
|
EXPORT
|
750 to 800
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25D4
|
41290
|
.014 to .016
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10
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13 @ 600
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N-9Y
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.024 to .026
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18V
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581-Y-H
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Aug-71
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EXPORT
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750 to 800
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25D4
|
41288
|
.014 to .016
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10
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13 @ 600
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N-9Y
|
.024 to .026
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18V
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582-F-H
|
Aug-71
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HOME
|
750 to 800
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25D4
|
41288
|
.014 to .016
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10
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13 @ 600
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N-9Y
|
.024 to .026
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18V
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582-Y-L
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Aug-71
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EXPORT
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750 to 800
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25D4
|
41290
|
.014 to .016
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10
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13 @ 600
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N-9Y
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.024 to .026
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18V
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582-Y-H
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Aug-71
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EXPORT
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750 to 800
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25D4
|
41288
|
.014 to .016
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10
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13 @ 600
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N-9Y
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.024 to .026
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18V
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583-F-H
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Aug-71
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HOME
|
750 to 800
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25D4
|
41288
|
.014 to .016
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10
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13 @ 600
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N-9Y
|
.024 to .026
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18V
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583-Y-H
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Aug-71
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EXPORT
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750 to 800
|
25D4
|
41288
|
.014 to .016
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10
|
13 @ 600
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N-9Y
|
.024 to .026
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18V
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584-Z-L
|
Aug-71
|
NA
|
850
|
25D4
|
41370
|
.014 to .016
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10
|
16 @ 1500
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N-9Y
|
.024 to .026
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18V
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585-Z-L
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Aug-71
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NA
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850
|
25D4
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41370
|
.014 to .016
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10
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16 @ 1500
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N-9Y
|
.024 to .026
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18V
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672-Z-L
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Aug-72
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NA
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850
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25D4
|
41491
|
.014 to .016
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6
|
12 @ 1500
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N-9Y
|
.024 to .026
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18V
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673-Z-L
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Aug-72
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NA
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850
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25D4
|
41491
|
.014 to .016
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6
|
12 @ 1500
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N-9Y
|
.024 to .026
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18V
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779-F-H
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Nov-73
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NOT NA
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850
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25D4
|
41491
|
.014 to .016
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6
|
12 @ 1500
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N-9Y
|
.024 to .026
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18V
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780-F-H
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Nov-73
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NOT NA
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850
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25D4
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41491
|
.014 to .016
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6
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12 @ 1500
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N-9Y
|
.024 to .026
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18V
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797-AE-L
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Dec-74
|
NA
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850
|
45D4
|
41599
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n/a
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n/a
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13 @ 1500
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N-9Y
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0.035
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18V
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798-AE-L
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Dec-74
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NA
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850
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45D4
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41599
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n/a
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n/a
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13 @ 1500
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N-9Y
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0.035
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18V
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801-AE-L
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Jul-75
|
USA
|
850 +/- 100
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45DE4
|
41600
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n/a
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n/a
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10 @ 1500
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N-9Y
|
0.035
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18V
|
802-AE-L
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Jul-75
|
USA
|
850 +/- 100
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45DE4
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41600
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n/a
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n/a
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10 @ 1500
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N-9Y
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0.035
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18V
|
836-Z-L
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Sep-74
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NA
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850
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45D4
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41599
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n/a
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n/a
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13 @ 1500
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N-9Y
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0.035
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18V
|
837-Z-L
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Sep-74
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NA
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850
|
45D4
|
41599
|
n/a
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n/a
|
13 @ 1500
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N-9Y
|
0.035
|
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18V
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846-F-H
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Sep-74
|
NOT NA
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850
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25D4
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.014 to .016
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|
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N-9Y
|
.024 to .026
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18V
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847-F-H
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Sep-74
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NOT NA
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850
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25D4
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.014 to .016
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N-9Y
|
.024 to .026
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18V
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846-F-H
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Jun-76
|
NOT NA
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850
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25D4
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|
.014 to .016
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N-9Y
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.024 to .026
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18V
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847-F-H
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Jun-76
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NOT NA
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850
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25D4
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|
.014 to .016
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N-9Y
|
.024 to .026
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18V
|
883-AE-L
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Jun-76
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FED
|
850 +/- 100
|
45DE4
|
41693
|
n/a
|
n/a
|
10 @ 1500
|
N-9Y
|
0.035
|
|
18V
|
884-AE-L
|
Jun-76
|
FED
|
850 +/- 100
|
45DE4
|
41693
|
n/a
|
n/a
|
10 @ 1500
|
N-9Y
|
0.035
|
|
18V
|
890-AE-L
|
Jun-76
|
CA & JAP
|
850 +/- 100
|
45DE4
|
41695
|
n/a
|
n/a
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10 @ 1500
|
N-9Y
|
0.035
|
|
18V
|
891-AE-L
|
Jun-76
|
CA & JAP
|
850 +/- 100
|
45DE4
|
41695
|
n/a
|
n/a
|
10 @ 1500
|
N-9Y
|
0.035
|
|
18V
|
892-AE-L
|
Aug-76
|
CANADA
|
850
|
25D4
|
|
.014 to .016
|
|
|
N-9Y
|
.024 to .026
|
|
18V
|
893-AE-L
|
Aug-76
|
CANADA
|
850
|
25D4
|
|
.014 to .016
|
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N-9Y
|
.024 to .026
|
ALL= All
markets
NOT NA = All markets but North America (USA and Canada)
NA = 50 States and Canada
USA = 50 States
CA = California only
FED = 49 States
CANADA= Canada only
JAP = Japan
HOME = Home Market
EXPORT = All markets except HOME , NA, & JAP
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