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MINNEAPOLIS-MOLINE SERVICELETTER

I got this information off of a serviceletter.
I hope it is all correct, if you see any mistakes let me know.
CYLINDER HEAD SPECIFICATIONS

CYLINDER HEIGHT DEPTH OF VOLUME TOTAL ENGINE COMP. COMP. PRESS HEAD PART OF HEAD COMB. IN HEAD CHAM. MODEL RATIO AT CRANKING NUMBER CHAMBER CU. IN. VOLUME SPEED ___________________________________________________________________________________________ ___________________________________________________________________________________________ 10A4202 5-3/4 2-1/8 28.6 28.6 283-425 3.5:1 70/90 403-605 4.35:1 80/100 ___________________________________________________________________________________________ 10A4203 5-3/4 2-1/8 20.6 22.0 283-425 4.2:1 75/95 22.5 403-605 5.55:1 85/105 ___________________________________________________________________________________________ 10A4204 5 1-3/4 18.9 20.0 283-425 4.5:1 85/105 20.5 403-605 5.9:1 95/125 ___________________________________________________________________________________________ 10A4205 5 1-3/4 15.7 17.0 283-425 5.2:1 95/115 18.0 403-605 6.7:1 130/150 ___________________________________________________________________________________________ 10A4206 4-17/32 1-1/8 8.4 9.6 283-425 8.35:1 170/195 10.5 403-605 10.85:1 205/225 9.7 336 9.65:1 180/200 HD504 9.7:1 180/200 ___________________________________________________________________________________________ 10A4207 4-17/32 1 7.3 8.5 283-425 9.3:1 190/215 8.6 403-605 17.6:1! 220/245 ___________________________________________________________________________________________ 10A4208 5-3/4 2-1/8 24 25.2 283-425 3.8:1 70/90 25.3 403-605 4.9:1 80/100 ___________________________________________________________________________________________ 10A4209 5 1-3/4 14 15.9 283-425 5.5:1 95/115 16.0 403-605 7.3:1 130/150 15.3 336 6.5:1 120/140 ___________________________________________________________________________________________ 10A4210 4-17/32 1-9/32 10.7 11.9 283-425 6.95:1 140/160 12.5 403-605 9.1:1 175/210 336-504 8.0:1 150/175 ___________________________________________________________________________________________ 10A4211 5-3/4 2-1/8 24 26.5 800 6.0:1 100/120 ___________________________________________________________________________________________ 10A4212 5 1-3/4 17.5 20 800 7.6:1 140/165 ___________________________________________________________________________________________ 10A4213 4-17/32 1-9/32 9.6 10.8 283-425 7.55:1 160/180 11.4 403-605 9.9:1 195/215 ___________________________________________________________________________________________ 10A4214 5 1-1/16 3.66 5.1 D283-D425 14.9:1 440/460 ___________________________________________________________________________________________ 10A4216 5-3/4 2-1/8 28.6 31.0 800 5.25:1 85/115 ___________________________________________________________________________________________ 10A4217 5 1-3/4 15.7 18.3 800 8.25:1 150/175 ___________________________________________________________________________________________ 10A4218 5 1-3/4 14.2 17.0 800 8.9:1 160/180 ___________________________________________________________________________________________ 10A4222 5 1-17/32 5.1 6.1 D336-D504 14.8:1 440/460 ___________________________________________________________________________________________ 10A4227 5-3/4 1-3/8 18.3 20.5 HD800A 7.5:1 150/170 ___________________________________________________________________________________________ 10A4228 5-41/64 1-17/64 16.9 19.0 HD800A 8.0:1 165/185 ___________________________________________________________________________________________ 10A4229 5-29/64 1-5/64 13.9 16.2 HD800A 9.2:1 200/220 ___________________________________________________________________________________________ 10A4230 4-17/32 1-5/16 13.0 14.5 336A, 504A, 6.8:1* 135/155 HD504A 13.8 336A, 504A, 7.1:1** 140/170 HD504A 14.0 605B 8.2:1 160/190 14.8 HD605-6A 7.8:1* 160/190 ___________________________________________________________________________________________ 10A4231 4-17/32 1-17/64 11.22 12.3 336A, 504A, 7.8:1* 160/180 HD504A 11.85 336A, 504A, 8.1:1** 170/190 HD504A 12.45 605B 9.1:1 190/220 13.2 HD605 8.65:1 185/205 ___________________________________________________________________________________________ 10A4232 4-17/32 59/64 9.31 10.75 336A, 504A, 8.8:1* 190/210 HD504A 10.35 336A, 504A, 9.1:1** 200/220 HD504A 11.45 425C, HD425 7.2:1 145/165 10.50 605B 10.6:1 265/285 11.0 HD605 10.2:1 245/265 ___________________________________________________________________________________________ 10A4233 4-15/32 53/64 7.90 9.35 336A, 504A, 10.01:1* 240/260 HD504A HD425 8.1:1* 170/190 8.95 336A, 504A, 10.4:1** 250/280 HD504 ___________________________________________________________________________________________ 10A4239 4-13/52 3/4 6.85 8.85 HD425, 425C 9.0:1 200/220 ___________________________________________________________________________________________ 10A5850, 4-1/16 1-7/32 3.06 4.46 D206-4 15.85:1 475/495 10A5850A ___________________________________________________________________________________________ 10A5851, 4-1/16 1 7.32 8.33 165 6.0:1 125/145 10A5851A 8.33 206 7.2:1 150/170 8.37 220 7.6:1 150/170 ___________________________________________________________________________________________ 10A5852, 3-7/8 13/16 5.12 6.13 165 7.7:1 155/175 10A5852A 6.13 206 9.4:1 185/205 6.17 220 10.0:1 195/215 ___________________________________________________________________________________________ 10A5853, 3-13/16 3/4 4.85 5.86 165 8.1:1 160/180 10A5853A 5.86 206 9.7:1 190/210 5.9 220 10.4:1 200/220 ___________________________________________________________________________________________ 10A5854 4-1/16 1 6.55 7.56 165 6.5:1 135/155 7.56 206 7.8:1 160/180 7.60 220 8.2:1 170/190 ___________________________________________________________________________________________ 10A5855 4-1/16 1-3/32 9.9 10.91 165 4.8:1 85/105 10.91 206 5.7:1 100/110 10.95 220 6.0:1 105/115 ___________________________________________________________________________________________ 10A5856, 3-15/16 7/8 5.66 6.67 165 7.1:1 145/165 10A5856A 6.67 206 8.6:1 175/210 6.71 220 9.2:1 185/205 6.25 220A, HD220A 9.8:1 210/230 ___________________________________________________________________________________________ 10A5857, 4-3/32 1-1/32 7.5 8.55 M220, M220B 7.4:1 150/160 10A5857A ___________________________________________________________________________________________ 10A5858 4-1/8 1-1/16 7.57 8.34 220A, HD220A 7.6:1 150/170 ___________________________________________________________________________________________ 10A5859 4 15/16 6.6 7.35 220 8.5:1 175/200 ___________________________________________________________________________________________ 10A23134 5 1/7/32 4.48 6.34 D336A, 14.3:1 440/460 D504A, DHD504A ___________________________________________________________________________________________ 10A23529 4-1/16 1-7/32 3.40 4.08 D236 15.5:1 475/495 ___________________________________________________________________________________________ 10A23791 5 1-5/64 4.39 5.22 D451 15.4:1 470/490 ___________________________________________________________________________________________ 11A30490 7 6.8 D585, 15.3:1 440/460 DHD585 ___________________________________________________________________________________________ 20-1008136 4-1/16 1-7/32 3.06 3.76 DHD236 16.7:1 475/594 ___________________________________________________________________________________________ *With 10A25953 Cavity Piston **With 10A21130 Flat Piston The ! mark is a comp. ratio, I don't think is right.


COMPRESSION RATIO VERSUS ALTITUDE

______________________________________________________________________________________________________________________________
 Engine         Fuel            Alt.            Head      Head      Head     Head     Total Comb.    Compression   Seal Level
                                                          Height    Depth    Volume   Chamber Vol.   Ratio         Comp. Press     
______________________________________________________________________________________________________________________________
______________________________________________________________________________________________________________________________
 EE, 165-4      Tractor Fuel    Below 4000'     RE226C                                10.3           5.0-1
 EE, 165-4      Tractor Fuel    4000'-8000'     10A2643                               9.2            5.5-1
 EE, 165-4      Tractor Fuel    Above 8000'     10A2647                               7.9            6.2-1
 EE, 165-4      Reg. Gaso.      All (Ex. RTI)   10A2647                               7.9            6.2-1
 EE, RTI        Reg. Gaso.      Below 4000'     10A2648                               9.2            5.5-1
 EE, RTI        Reg. Gaso.      Above 4000'     10A2647                               7.9            6.2-1
 EE, 165-4      LP Gas, N.G.    All             10A2647                               7.9            6.2-1
______________________________________________________________________________________________________________________________
 V206-4         Reg. Gaso.      Below 4000'     10A1987                               10.2           6.1-1
 V206-4         Reg. Gaso.      Above 4000'     10A3532                               9.1            6.7-1
______________________________________________________________________________________________________________________________
 206B-4         Tractor Fuel    Below 4000'     RE226E                                13.9           4.7-1
 206B-4         Tractor Fuel    4000', 8000'    RE226D                                11.7           5.4-1
 206B-4         Tractor Fuel    Above 8000'     RE226C                                10.2           6.1-1
 206B-4         Reg. Gaso       Below 4000'     RE226C                                10.2           6.1-1
 206B-4         Reg. Gaso       4000' 8000'     10A2648                               9.1            6.7-1
 206B-4         Reg. Gaso       Above 8000'     10A2647                               7.7            7.7-1
 206B-4         LP Gas          All             10A2647                               7.7            7.7-1
____________________________________________________________________________________________________________________________
 283-4, 425-6   Tractor Fuel    Below 4000'     GE30K     5         1-3/4    18.9     20.8           4.4-1         90-110
 283-4, 425-6   Tractor Fuel    Above 4000'     GE30N     5         1-3/4    15.7     17.6           5.03-1        110-130
 283-4, 425-6   Tractor Fuel    Above 8000'     GE30E     5         1-3/4    14.2     16.1           5.4-1         115-135
 283-4, 425-6   Reg. Gaso.      Below 4000'     GE30Z     4-17/32   1-9/32   11.3     13.2           6.34-1        130-150
 283-4, 425-6   Reg. Gaso.      Above 4000'     GE30J     4-17/32   1-9/32   10.3     12.2           6.85-1        160-180
 283-4, 425-6   Reg. Gaso.      Above 8000'     GE30P     4-17/32   1-1/8    8.3      10.2           7.9-1         180-200
 283-4, 425-6   N.G.,  Lp Gas   Below 4000'     GE30P     4-17/32   1-1/8    8.3      10.2           7.9-1         180-200
 283-4, 425-6   N.G.,  Lp Gas   Above 4000'     GE30T     4-17/32   1"       7.3      9.2            8.7-1         215-235
______________________________________________________________________________________________________________________________
 340-4LP        Gas             All             GE30T     4-17/32   1"       7.3      10.8           8.8-1
______________________________________________________________________________________________________________________________
 403-4, 605-6   Tractor Fuel    Below 4000'     GE30      5-3/4     2-1/8    28.6     31.            4.25-1        85-105
 403-4, 605-6   Tractor Fuel    Above 4000'     GE30U     5-3/4     2-1/8    24.0     26.4           4.82-1        105-125
 403-4, 605-6   Tractor Fuel    Above 8000'     GE30K     5         1-3/4    18.9     21.3           5.74-1        130-150
 403-4, 605-6   Reg. Gaso       Below 4000'     GE30A     5-3/4     2-1/8    20.6     23.0           5.38-1        105-125
 403-4, 605-6   Reg. Gaso       Above 4000'     GE30N     5         1-3/4    15.7     18.1           6.58-1        155-175
 403-4, 605-6   Reg. Gaso       Above 8000'     GE30E     5         1-3/4    14.2     16.6           7.08-1        165-185
*403-4, 605-6   N.G.,  Lp Gas   Below 4000'     GE30F     5         1-3/4    14.2     16.6           7.08-1        165-185
*403-4, 605-6   N.G.,  Lp Gas   Above 4000'     GE30M     4-17/32   1-9/32   11.9     14.3           8.05-1        180-200
*403-4, 605-6   N.G.,  Lp Gas   Above 8000'     GE30J     4-17/32   1-9/32   10.3     12.7           8.95-1        220-240
______________________________________________________________________________________________________________________________
 1210-12        Reg. Gaso       Below 4000'     GE30K     5         1-3/4    18.9     21.3           5.74-1        130-150
 1210-12        Reg. Gaso       Below 8000'     GE30N     5         1-3/4    15.7     18.1           6.58-1        155-175
 1210-12        Reg. Gaso       Above 8000'     GE30E     5         1-3/4    14.2     16.6           7.08-1        165-185
 1210-12        N.G.,  Lp Gas   Below 4000'     GE30M     4-17/32   1-9/32   11.9     14.3           8.05-1        175-195
 1210-12        N.G.,  Lp Gas   Above 4000'     GE30J     4-17/32   1-9/32   10.3     12.7           8.95-1        220-240
______________________________________________________________________________________________________________________________
 NOTE:  Some recommendatios based on past practice rather than actual correction formulae.
                            *Power Units only.                                            Reproduced 6/4/53


I hope this info is helpful

     Let me know if you have any more data on heads, or anything you think would be 
helpful for other collectors and pullers.

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