Cylinder head specifications
Car Model
Engine type
(first six digits of
engine serial number)
Height of new head (mm)
Maximum material removal (mm)
Maximum Long. excentricity (mm)
Maximum Lateral excentricity (mm)
Total Compression sapce (with Head installed) (c.c)
Compression Ratio
Combustion chamber volume (with valves & plug)
190 C
121.924
84.8/85
1.0
0.1
0
60.8/64.1
8.7:1
51.1/52.1
200
121.940
84.8/85
1.0
0.1
0
61.4/64.6
9.0:1
49.5/50.5
190 DC
621.912
84.8/85
0.8
0.1
0
23.5/25.5 *3*2
21.0:1
200 D
621.918
84.8/85
0.8
0.1
0
23.5/25.5 *3*2
21.0:1
230
180.945
/180.949
84.8/85
0.8
0.1
0
*4
*4
*4
220 b
180.940
84.8/85
0.8
0.1
0
*1
*1
*1
220 Sb
180.941
84.8/85
0.8
0.1
0
*1
*1
*1
230 S
180947
84.8/85
0.8
0.1
0
*4
*4
*4
250 S
108.920
84.8/85
0.8
0.1
0
*4
*4
*4
220 SEb
127.982
84.8/85
0.8
0.1
0
*1
*1
*1
250 SE
129.980
84.8/85
0.8
0.1
0
48/50.7
9.5:1
40.7/41.7
230 SL
127.981
84.8/85
0.8
0.1
0
45.3/48
9.5:1
37.5/38.5
250 SL
129.982
84.8/85
0.8
0.1
0
not available
9.5:1
not available
250 SE/C
129.980
84.8/85
0.8
0.1
0
48/50.7
9.5:1
40.7/41.7
300 SE
189.984/86/85/87
See Ilustration I
(A & B)
0.8
0.08
0
62/65 *2
8.8:1
300 SEb
189.989
0.8
0.08
0
62/65
8.8:1
300 SEL
189.988
0.8
0.08
0
62/65
8.8:1
300 SE/C
189.987
0.8
0.08
0
62/65
8.8:1
220 D/8
615.912
84.8/85
0.8
0.1
0
27/28 *3*2
21.0:1
220 /8
115.920
84.8/85
1.0
0.1
0
67.8/71.1
9.0:1
57.6/58.6
230 /8
180.954
84.8/85
0.8
0.1
0
47/49.7
9.0:1
37.6/38.6
250 /8
114.920
84.8/85
0.8
0.1
0
51/53.7
9.0:1
42.4/43.4
280 S/8
130.920
84.8/85
0.8
0.1
0
not available
9.0:1
not available
280 SE/8
130.980
84.8/85
0.8
0.1
0
not available
9.5:1
not available
280 SEL/8
130.980
84.8/85
0.8
0.1
0
not available
9.5:1
not available
280 SL/8
130.983
84.8/85
0.8
0.1
0
not available
9.5:1
not available
300 SEL/8 (2.8)
130.981
84.8/85
0.8
0.1
0
not available
9.5:1
not available
300 SEL/8 (6.3)
100.981
0.5
0.08
0
98/102
9.0:1
86.7/88.7
Note *1
As engine numbers:
180 940-10-044 200
127 982-10-031 774
180 940-12-000 517
127 982-12-004 498
180 941-10-091 448
127 984-10-006 556
180 941-12-003491
127 984-12-001 611
Comb. Chamber
Compress. Ratio
Total Compress. Space (c.c.)
Compress Space in Head (c.c.)
# 1 Cil.
 8.7:1
49.5/53.1 
 39.0/40.0
# 2Cil.
 8.5:1
 48.2/50.8
37.7/38.7 
# 3/6Cil.
8.3:1 
46.9/49.5 
36.4/37.4 
Note *2

Total Compression Space with cylinder head installed is determined by piston shape

Note *3

Prechamber end to cylinder head surface distance "C" must be readjusted to 0.2145" / 0.2301" if head is milled by installing a thicker gasket at 13 (see ilustration C)

Note *4

Model
230, 230S, 250S
230, 230S
250S
230, 230S
250S
Combustion Chamber
Compression Ratio
Total Compress Space (c.c.)
Compress Space in Head (c.c.)
# 1 Cil
8.6:1
49.3/52.6
53.4/57
40.1/41.1
44.3/45.3
# 2Cil
8.8:1
48.0/51.2
52.0/55.5
38.8/39.8
42.9/43.9
# 3 / 6 Cil
9.0:1
47.0/49.2
51.0/53.7
37.6/38.6
41.6/42.6

Ilustration 1