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THERMO ELECTRON MARINE 12
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Engine Years CC Bore X Stroke Cyl Models
427 Chevrolet OHV 7000 cc 4.25X 3.77 8 cyl
454 Chevrolet OHV 7400 cc 4.25X 4.00 8 cyl

King Set No
Part No
Qty
Position
Crankshaft
Diameter
Housing
Diameter
Bearing
Length
Max Wall Thickness
CR 808SI
ACL:8B743A CLE:CB- 743P(8) ~ FMO:8-3190AP ~
C 808
8 Pairs

2.1990/ 2.2000
55.855/ 55.880
2.3247/ 2.3252
59.047/ 59.060
0.8920
22.66
0.0622
1.580
CR 808XPN
XTREME PERFORMANCE, NO DOWEL HOLE
ACL:1B743H CLE:CB-743H FMO:8-7200CH
C 808U/N
C 808L/N
8 Pairs

2.1990/ 2.2000
55.855/ 55.880
2.3247/ 2.3252
59.047/ 59.060
0.8420
21.39
0.0619
1.572
CR8015SI
STD/010/020/030
same as CR 808SI but with Housing bore resized .002" larger
ACL:8B743AO/S2
C8015
8 Pairs

2.1990/ 2.2000
55.855/ 55.880
2.3267/ 2.3272
59.098/ 59.111
0.8920
22.66
0.0630
1.600
CS 524BB
From 1967
ACL:5C616 CLE:SH- 616S DUR:CH-12 FMO:1404M

CS 524HP
High Performance, from 1967
DUR:CHP-12 FMO:2101M

CS 524HPT
High Performance, coated, from 1967
DUR:CHP-12T

CS4404BB
For 427 engs. thru 1966
ACL:5C615S CLE:SH- 615S DUR:CH-9A FMO:1225M

MB 556SI
060
ACL:5M829 CLE:MS- 829P~ FMO:4400M VAN:VPM91276
M 556U
M 556L

F 556U
F 556L
4 Pairs

1 Pair
1-2-3-4

5

2.7485/ 2.7495
69.812/ 69.837

2.7478/ 2.7488
69.794/ 69.820
2.9370/ 2.9380
74.600/ 74.625

2.9370/ 2.9380
74.600/ 74.625
1.0440
26.52

1.8110
46.00
0.0936
2.377

0.0936
2.377
MB 556XP
STD/001/010/011/020/030/010X/020X/S
XTREME Performance Grooved Upper Halves Plain Lower Halves Fl STD. only.
ACL:5M829H CLE:MS-829H FMO:141M
M 556U/PR
M 556L/PR

F 556U/PR
F 556L/PR
4 Pairs

1 Pair
1-2-3-4

5

2.7482/ 2.7492
69.804/ 69.830

2.7478/ 2.7488
69.794/ 69.820
2.9370/ 2.9380
74.600/ 74.625

2.9370/ 2.9380
74.600/ 74.625
1.0470
26.59

1.8110
46.00
0.0934
2.372

0.0934
2.372
MB5105AM
STD/010/020/030
fully grooved version of MB 556AM
FMO:7273M
M 556U
M5105L

F 556U
F5105L
4 Pairs

1 Pair
1-2-3-4

5

2.7485/ 2.7495
69.812/ 69.837

2.7478/ 2.7488
69.794/ 69.820
2.9370/ 2.9380
74.600/ 74.625

2.9370/ 2.9380
74.600/ 74.625
1.0440
26.52

1.8110
46.00
0.0936
2.377

0.0936
2.377
MB5212AM
010/020/030/050/060
Same as MB 556AM but with flange oversize .010". Flange length: 46.25mm.
CLE:MS-1745

MB5213AM
010/020/030
Same as MB 556AM but with flange oversize .020". Flange length: 46.50mm.
FMO:7122M

MB5214AM
020
Same as MB 556AM but with flange oversize .030". Flange length: 46.75mm.

MB5274SI
same as MB 556SI but with .020" oversize OD
M5274U
M5274L

F5274U
F5274L
4 Pairs

1 Pair
1-2-3-4

5

2.7485/ 2.7495
69.812/ 69.837

2.7478/ 2.7488
69.794/ 69.820
2.9570/ 2.9580
75.108/ 75.133

2.9570/ 2.9580
75.108/ 75.133
1.0440
26.52

1.8110
46.00
0.1036
2.631

0.1036
2.631

	THERMO ELECTRON MARINE				12
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Engine	Years	CC	Bore X Stroke	Cyl	Models
427 Chevrolet OHV		7000 cc	4.25X 3.77	8 cyl
454 Chevrolet OHV		7400 cc	4.25X 4.00	8 cyl

King Set No	Part No	Qty	Position	Crankshaft Diameter	Housing Diameter	Bearing Length	Max Wall Thickness
CR 808SI ACL:8B743A CLE:CB- 743P(8) ~ FMO:8-3190AP ~	C 808	8 Pairs		2.1990/ 2.2000 55.855/ 55.880	2.3247/ 2.3252 59.047/ 59.060	0.8920 22.66	0.0622 1.580
CR 808XPN XTREME PERFORMANCE, NO DOWEL HOLE ACL:1B743H CLE:CB-743H FMO:8-7200CH	C 808U/N C 808L/N	8 Pairs		2.1990/ 2.2000 55.855/ 55.880	2.3247/ 2.3252 59.047/ 59.060	0.8420 21.39	0.0619 1.572
CR8015SI STD/010/020/030 same as CR 808SI but with Housing bore resized .002" larger ACL:8B743AO/S2	C8015	8 Pairs		2.1990/ 2.2000 55.855/ 55.880	2.3267/ 2.3272 59.098/ 59.111	0.8920 22.66	0.0630 1.600
CS 524BB From 1967 ACL:5C616 CLE:SH- 616S DUR:CH-12 FMO:1404M
CS 524HP High Performance, from 1967 DUR:CHP-12 FMO:2101M
CS 524HPT High Performance, coated, from 1967 DUR:CHP-12T
CS4404BB For 427 engs. thru 1966 ACL:5C615S CLE:SH- 615S DUR:CH-9A FMO:1225M
MB 556SI 060 ACL:5M829 CLE:MS- 829P~ FMO:4400M VAN:VPM91276	M 556U M 556L F 556U F 556L	4 Pairs 1 Pair	1-2-3-4 5	2.7485/ 2.7495 69.812/ 69.837 2.7478/ 2.7488 69.794/ 69.820	2.9370/ 2.9380 74.600/ 74.625 2.9370/ 2.9380 74.600/ 74.625	1.0440 26.52 1.8110 46.00	0.0936 2.377 0.0936 2.377
MB 556XP STD/001/010/011/020/030/010X/020X/S XTREME Performance Grooved Upper Halves Plain Lower Halves Fl STD. only. ACL:5M829H CLE:MS-829H FMO:141M	M 556U/PR M 556L/PR F 556U/PR F 556L/PR	4 Pairs 1 Pair	1-2-3-4 5	2.7482/ 2.7492 69.804/ 69.830 2.7478/ 2.7488 69.794/ 69.820	2.9370/ 2.9380 74.600/ 74.625 2.9370/ 2.9380 74.600/ 74.625	1.0470 26.59 1.8110 46.00	0.0934 2.372 0.0934 2.372
MB5105AM STD/010/020/030 fully grooved version of MB 556AM FMO:7273M	M 556U M5105L F 556U F5105L	4 Pairs 1 Pair	1-2-3-4 5	2.7485/ 2.7495 69.812/ 69.837 2.7478/ 2.7488 69.794/ 69.820	2.9370/ 2.9380 74.600/ 74.625 2.9370/ 2.9380 74.600/ 74.625	1.0440 26.52 1.8110 46.00	0.0936 2.377 0.0936 2.377
MB5212AM 010/020/030/050/060 Same as MB 556AM but with flange oversize .010". Flange length: 46.25mm. CLE:MS-1745
MB5213AM 010/020/030 Same as MB 556AM but with flange oversize .020". Flange length: 46.50mm. FMO:7122M
MB5214AM 020 Same as MB 556AM but with flange oversize .030". Flange length: 46.75mm.
MB5274SI same as MB 556SI but with .020" oversize OD	M5274U M5274L F5274U F5274L	4 Pairs 1 Pair	1-2-3-4 5	2.7485/ 2.7495 69.812/ 69.837 2.7478/ 2.7488 69.794/ 69.820	2.9570/ 2.9580 75.108/ 75.133 2.9570/ 2.9580 75.108/ 75.133	1.0440 26.52 1.8110 46.00	0.1036 2.631 0.1036 2.631