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The factory put an M code on the fan housing to indicate to the workers what options were on the car. It more than likley is M236 and M726 as M codes are 3 numbers long. David got the answers to them. The sticker on top of the housing plate is a factory recomended valve adjustment sticker. ISPWest has them. As far as LO it might Low Octane? Which would mean the pistons are dished in creating the lower compression. You more than likley have a later FI motor in your 65. The only way to know is the case number on top of the motor. I listed the codes that I have as I dont have a link. Sorry for the length:) jason M 3 = SINGLE CARBURETOR ENGINE INSTEAD OF TWIN CARBURETOR ENGINE M 14 = NAME PLATE "VOLKSWAGEN" INSTEAD OF CURRENT PRODUCTION NAME PLATES (Export markets) M 18 = EMERGENCY LIGHT SYSTEM (318 000 001- 318 500 000) M 20 = SPEEDOMETER IN MILES PER HOUR M 26 = ACTIVATED CARBON CONTAINER FOR ABSORBING FUEL VAPOUR (1970-72 for USA & Canada) M 27 = LAP BELT WITH REEL FIXUTRE (from 317 500 000 for USA & Canada) M 27 = COMPLIANCE WITH US EXHAUST EMISSION STANDARDS (1972) M 30 = HEADLAMP FLASHER WITH SIMULTANEOUS LICENSE PLATE ILLUMINATION (Austria) M 34 = LOUD HORN AND WHITE FRONT FLASHING INDICATORS (Italy) M 37 = WITHOUT EMERGENCY LIGHT SYSTEM (France & Italy) M 46 = SIDE-MOUNTED TURN SIGNALS (Norway & Denmark) M 47 = BACK-UP LIGHT M 50 = DUAL CIRCUIT BRAKE WARNING LIGHT (from 318 000 001) M 54 = LOCKABLE GLOVE COMPARTMENT LID M 60 = HEATER BOOSTER FOR UNDERFLOOR HEATING (from 319 108 900 to 319 500 000) M 60 = EBERSPAECHER STATIONARY HEATER (from 310 2000 01) M 62 = WATER CONTAINER WITH DECREASED AIR CAPACITY AND ADDITIONAL AIR HOSE, MODIFIED TAIL PIPE, ADDITIONAL REAR VIEW MIRROR (outer right convex LHD only) (from 310 2500 000 in Sweden) M 62 = MODIFIED TAIL PIPE, ADDITIONAL REAR VIEW MIRROR (outer right convex LHD only) (from 311 2500 000) M 74 = MUD FLAP, REAR M 75 = WARNING TRIANGLE ATTACHMENT M 82 = MOUNTING PARTS FOR FIRST AID KIT M 83 = WARNING TRIANGLE M 86 = DRUM BRAKES, SELF ADJUSTING (from 313 2000 001 for Sweden) M 89 = WINDSHIELD GLASS (LAMINATED) M 93 = HINGED QUARTER WINDOWS M 102 = REAR WINDOW GLASS (HEATABLE) M 103 = LARGER REFLECTORS & SHOCK ABSORBERS (heavy duty) for Sweden M 104 = HARDER BONDED RUBBER MOUNTING FOR TRANSMISSION (from 312 2500 000) M 106 = UPHOLSTERY MATERIAL, SPECIAL VERSION (cloth) (from 312 2133 001 for GERMAN POST OFFICE & POLICE) M 108 = CUSTOM MODEL (simplified version from 312 2095 731 for USA) M 110 = COMPRISING M20,M227,M242,M246,M247,M255,M268,M617 CUSTOM MODELS WITH HINGED QUARTER WINDOWS AND HEADREST F 318 500 000 311-318,CANADA 361-368 M 119 = EBERSPAECHER STATIONARY HEATER (from 315 220 883) M 121 = FRESH AIR FAN (from 311 2000 001) M 123 = SPECIALLY SUPPRESSED PARTS M 124 = YELLOW HEADLAMPS & SAFETY REAR VIEW MIRROR M 139 = DUAL CIRCUIT BRAKES (from 317 000 001to 317 500 000 for USA & Canada) M 156 = LARGER AIR CLEANER FOR DUSTY REGIONS (SINGLE CARBURETOR) M 157 = EXHAUST CONTROL SYSTEM AND ACTIVATED CORBON CONTAINER FOR ABSORBING FUEL VAPOUR (from 313 2000 001for USA & Canada) M 163 = BUMPERS AND WHEEL CAPS (PRIME COATED) M 184 = THREE POINT SAFETY BELT (front seat from 312 2069 322 for Sedan only for USA & Canada) M 185 = THREE POINT SAFETY BELT (front seat from 318 000 001to 312 2069 32 for USA & Canada) M 185 = THREE POINT SAFETY BELT (front seat & rear lap belt from 312 2069 322 for USA & Canada) M 186 = LAP BELT FOR REAR SEAT (from 318 000 001to 312 2069 32 for USA & Canada) M 187 = HEADLAMP FOR LEFT-HAND TRAFFIC M 190 = INCREASED SIDE DOOR STRENGTH (from 313 2058 438) M 208 = VEHICLES WITH TRAILER (from 312 2000 001) M 220 = LIMITED SLIP DIFFERENTIAL M 229 = COLD START EQUIPMENT SEAT (from 318 000 001-- 319 500 000) M 236 = 311-314, 361-364; M236/ M234/ M250: 315-318 M 233 = VW 1600 TL IN SIMPLIFIED VERSION LIKE MODEL 311 (from 319 000 000) M 234 = CHROME AND INTERIOR TRIM AS IN MODEL 311 (from 317 000 001) M 236 = FUEL INJECTION SYSTEM INSTEAD OF WITH CARBURETOR M 237 = MOLDINGS, OVERRIDERS, TRIM RINGS, SECOND SUN VISORS, CLOCK, LOOP CARPETING, AND FLASHING INDICATORS AS IN MODEL 311 (from 316 000 001to 319 500 000) & EXTENDED INTERIOR TRIM PROGRAM (from 310 2000 001) M 239 = SEALED BEAM HEADLIGHTS, FLASHING INDICATORS, SIDE MARKER LIGHTS, RED TAILLIGHTS, M234: DUAL CIRCUIT WARNING LIGHT, BACK UP LAMP, FUEL INJECTION ENGINE WITH DASHPOT, WITHOUT HEADLAMP FLASHER AND PARKING LAMP (USA & Canada) M 240 = ENGINE WITH RECESSED PISTONS LOW OCTANE FUEL M 242 = SEALED BEAM HEADLIGHTS, FLASHING INDICATORS WITH LATERAL LIGHT DIFFUSION, RED TAILLIGHTS, EMERGENCY LIGHTS, DUAL CIRCUIT BRAKE WARNING LIGHT, BACK-UP LAMP, WITHOUT HEADLAMP FLASHER, PARKING LAMP (from 318 000 001to 319 500 000 for USA & CANADA) M 244 = TINTED REAR WINDOW GLASS M 245 = ENGINES WITH SIMPLIFIED HEAT EXCHANGERS (up to 318 500 000 for Australia & South Africa) M 246 = EBERSPAECHER STATIONARY HEATER (from 316 000 001to 310 2500 000) M 248 = AUTOMATIC TRANSMISSION (to 319 500 000 for Export markets) M 249 = AUTOMATIC TRANSMISSION (from 318 015 226) M 250 = AUTOMATIC TRANSMISSION (for Variant) M 250 = 54 BHP ENGINE INSTEAD OF 45 BHP ENGINE (from 0 221 975) M 258 = HIGHER FRONT SEAT BACKREST WITH HEADREST M 259 = MOUNTING POINTS FOR LAP SAFETY BELTS (to 316 500 000 for Export models) M 260 = BACKREST, REAR WITHOUT ARM REST M 261 = ADDITIONAL REAR VIEW MIRROR, OUTER RIGHT (for Variant) M 263 = HEAVY DUTY EQUALIZER SPRING FOR INCREASED PAYLOAD (from 367 000 001 for Variant) M 265 = WELDED-IN SIDE WINDOW PANELS, CENTER AND REAR (for Variant) M 267 = AUXILIARYSPRING FOR REAR AXLE (to 366 500 000) M 273 = SEALED BEAM HEADLIGHTS RED TAILLIGHT, BUT WITHOUT HEADLAMP FLASHER (to 0 221 974 for Export markets & USA) OR (from 0 221 975 for Export markets except USA) M 278 = SIDE MOUNTED TURN SIGNALS INSTEAD OF PARKING LAMPS (to 312 2066 941 for Italy, Austria, Denmark, Finland, & Norway) M 281 = SPECIAL REFLECTORS AND YELLOW HEADLAMPS BULBS (to 316 500 000 for France, Algeria, & Morocco) M 282 = SUN VISOR WITH MIRROR (from 311 2000 000) M 285 = 88 AMP HOUR BATTERY (to 316 500 000) M 284 = BUMPER, REAR WITH RECESS FOR LICENSE PLATE (to 311 2500 000 for Export markets) M 289 = SHEER BOLT FOR COLUMN TUBE ATTACHMENT (from 312 2000 001 for Denmark) M 290 = MUD FLAPS, REAR (to 311 2108 457 for Netherlands) M 299 = REAR SEAT BACKREST LOCK (from 312 2000 001for Variants in USA & Sweden) M 527 = EXHAUST EMISSION CONTROL (from 311 2000 001 for Japan & Sweden) M 528 = REAR VIEW MIRROR, OUTER, RIGHT, CONVEX M 551 = HEADLAMPS WITH HALOGEN BULBS INSTEAD OF NORMAL BULBS (from 317 000 001) M 557 = CLOCK WITH PRESELECTOR HEATER TIME SWITCH (from 311 2000 001) M 562 = RECLINING SEAT FITTINGS (from 312 2133 001 but not for USA) M 571 = REAR FOG LAMP (form 317 000 001) M 594 = REINFORCED DISK BRAKES AND MODIFIED DUAL CIRCUIT BRAKE SYSTEM F 362 2000 001-- 361,363,SWEDEN 365,367 M 601 = SPECIAL EQUIPMENT PACKAGE CONPRISING: BACK UP LAMP, REAR WINDOW GLASS (HEATABLE), EMERGENCY LIGHT SYSTEM, & DUAL CIRCUIT BRAKE WARNING LIGHT (for 1968) M 602 = SPECIAL EQUIPMENT PACKAGE COMPRISING: EMERGENCY LIGHT SYSTEM, DUAL CIRCUIT BRAKE WARNING LIGHT (1968) M 616 = BACK-UP LIGHT IN THE BRAKE INDICATOR LIGHT (from 310 2000 001to 310 2500 000) M 617 = WATER CONTAINER WITH DECREASED AIR CAPACITY AND ADDITIONAL AIR HOSE (from 318 000 001--310 2500 000) M 630 = 12 VOLT SYSTEM (to 316 500 000) M 633 = 12 VOLT SYSTEM FULLY SUPPRESSED M 634 = EMERGENCY LIGHT 12 VOLT (to 317 500 000 for Police use) M 652 = INTERVAL RELAY FOR WINDSHIELD WIPER FOR MOTOR (from 312 2000 000) M 659 = HALOGEN FOG LAMP (from 317 000 001) S 755 = SPECIAL VERSION AND SPECIAL PAINT FINISH INCLUDING MOLDINGS CLOCK, LOOP CARPETING (from Oct 1972) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org