Jeeps prior to 1962 typically used a serial number. From 1955 to 1971 VIN numbers are usually located in several possible locations. You should find a tin plate on. The Willys engine serial numbers do NOT match the jeep's data plate serial numbers, nor the frame serial numbers, even if it is the original factory. Predecessor to the M38. The CJV-35/U operated with the L134 engine with modifications for engine ventilation and electrical waterproofing. Production Information. Willys 641087 (transition) CJ2A Block. Willys 641087 CJ3A Block. Willys 641087 M38/MC Block. Willy 804380 M38/MC Block. You have between a 1946-1949 Willys Truck / Station Wagon. You have between a 1950-1953 Willys Truck / Station Wagon. Is your 6 cylinder motor a flat head.
Casting Numbers Tell?
Basic information about your jeep...
Because the 134 cu. in.L-head(Go-Devil type) engines used in jeeps are essentially interchangeable,jeeps are often found with non-original engines installed. The castingnumbers on an engine or block can be used to help determine what engineyour vehicle has. The casting numbers are part of theenginecasting and are not stamped onto the metal of the block like a serialnumber.(See serialnumber page). Generally, the block casting numbers are foundon the right side of the engine block below the distributor. The blockcasting numbers are raised-not stamped. The head casting numbers arenormallyon the topof the head in the right front corner. Head casting numbers areeitherraised or recessed, but not stamped.
It is helpful to know thecastingnumber needed when searching for correct replacement blocks or headsforyour MB or GPW.
Note: This table is underconstructionand may contain errors -(Ren Bernier, 12/9/02)
(Information contributed by JoePotter, Alisdair Brass, Jon Rogers, Mark Tombleson, Jim Kilborn, FredColdwelland others.)
| Vehicle | Block# | Head# | Images of CastingNos. |
| MB 1941-45 | 638632 | 639660 | |
| GPW 1942-45 | GPW 6015 | 6050 | |
| CJ2A 1946-49 | 641087 (Very earlyblocks - 638632) | 640161 | CJ2A Engine CJ2AHead |
| CJ3A 1950-53 | 641087 | 640161 | CJ3A Engine CJ3A Head |
| M38 1950-52 | 641087 through s/n MC74419 804380 after s/n MC74419 | 800376 | |
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Willys L134 Engine Serial Numbers List
| Willys MB & Ford GPW 1941-1945 - Windshield height 23', flat fenders, split windshield, no tailgate, recessed headlights top mounted windshield wipers, rear mounted spare tire, hood height 6'. 5'x5.5' rim bolt pattern. 80' Wheelbase. The Willys chassis front cross-member is tubular, while the Ford GPW is an inverted U shape. |
| Willys Jeep CJ2A 1945-1949 - Windshield height 25', flat fenders, split windshield, has tailgate, top mounted windshield wipers, side mounted spare tire, hood height 6'. 5'x5.5' rim bolt |
| Willys Jeepster VJ 1948-1951 - 2wd convertable sports car Jeep produced by Willys Overland on the 4-63 chassis (Willys 4x2 wagon). |
| Willys Jeep CJ3A 1948-1953 - Windshield height 27', flat fenders, one piece windshield, vent in middle of windshield, bottom mounted windshield wipers, hood height 6'. 5'x5.5' rim bolt pattern. 80' Wheelbase. |
| Willys Jeep Truck 1947–1964 - Similar to the Willys Jeep Wagon, Wheel base is 118', Engines L4-134 Go-Devil, F4-134 Hurricane, 6-226 Super Hurricane I6, 1950-64 V-Shaped Front Grille. |
| Willys Station Wagon 1946–1964 - Flat Grille 1945-49, Wheel base is 104.5', Engines L4-134 Go-Devil, F4-134 Hurricane, F6 6-161 Hurricane I6, 6-226 Super Hurricane I6, 1950-64 V-Shaped Front Grille. |
| Willys Jeep M38 1950-1952 - Windshield height 27', flat fenders, one piece windshield, vent in middle of windshield, bottom mounted windshield wipers, hood height 6'. 5'x5.5' rim bolt, originally 24 Volt Ignition System. |
| Willys Jeep M38A1 1952-1966 - 80' Wheelbase, Windshield width 59', rounded fenders, one piece windshield, F4-134 Hurricane Engine, 5'x5.5' rim bolt pattern, no Tail Gate, originally 24 Volt Ignition System. |
| Willys Jeep CJ3B 1953-1964 - Windshield height 22-1/2', hood height 10-1/2', one-piece windshield, has tailgate, bottom mounted windshield wipers, side mounted tire carrier. 5'x5.5' rim bolt. |
| Dispatch Jeep DJ3A 1956-1964 - The DJ3A was a flat fender postal & delivery Jeep similar to the CJ3A except it was two wheel drive. The engine was the L4-134 'Go Devil' Flathead. All DJ models were 2wd. It was produced from 1956 until 1964 |
| Jeep CJ5 1955-1975 - 80' Wheelbase and CJ5 with 81' wheelbase. Windshield width 59', round fender Jeep, one piece windshield, no factory door hinges, windshield retainer welded on vehicle, windshield at 90° angle to hood. 5'x5.5' rim bolt pattern. |
| Jeep CJ6 1955-1975 - Windshield width 59', round fender Jeep, one piece windshield, no factory door hinges, windshield retainer welded on vehicle, windshield at 90° angle to hood. CJ6 is the same basic vehicle as an early model CJ5 except with an extended rear body tub and 101' wheelbase for '55-'71 and 103' wheelbase for '72-'75. 5'x5.5' rim bolt pattern. |
| Forward Control FC-150 1956-1964 - Wheel base 81', F4-134 Hurricane Engine, FC-150 models used the frame of the CJ-5, 78' bed. |
| Dispatch Jeep DJ5 1965-1982 - The DJ-5 was introduced in 1965. The DJ is the Postal Jeep most people recognize today. They also produced a long version from 1965 until 1968, the DJ-6. The DJ-5 was made by Jeep into the early 70's and production continued under AM General till 1982. All DJ models were 2wd. |
| Jeepster Commando C101 1967-1971 - Jeep roadster with either a full soft top, a half hardtop forming a truck. Wheel base is 101' forming the model number. |
| Jeep Commando C104 1972-1973 - Jeep roadster with either a full soft top, a half hardtop forming a truck. Wheel base is 104' forming the model number. Front Grille was changed from the traditional Jeep style design. |
| Jeep CJ5 1976-1983 - Windshield width 55', round fender Jeep, one piece windshield, factory roll bar, bottom mounted windshield wipers, factory mounted door hinges, windshield retainer screws on, sloped windshield. Measures 71-1/2' from door hinge to rear of vehicle. 5'x5.5' rim bolt pattern. 83.5' wheelbase. |
| Jeep CJ7 1976-1986 - Windshield width 55', round fender Jeep, one piece windshield, factory roll bar, bottom mounted windshield wipers, factory mounted door hinges, has either no windshield retainer or screw-in design. Measures 81' from door hinge to rear of vehicle. 93.5' wheelbase. 5'x5.5' rim bolt pattern. |
| Jeep CJ8 Scrambler 1981-1985 - Windshield width 55', round fender Jeep, one piece windshield, factory roll bar, bottom mounted windshield wipers, factory mounted door hinges, 103.5' wheelbase. 5'x5.5' rim bolt pattern. |
| Jeep Wrangler YJ 1987-1995 - Windshield width 55', round fender Jeep, one-piece windshield, factory roll bar with horizontal supports, rectangular headlights and turn signal lights, and a squared off front grille. Comes with either half or full hard doors. 93.4' wheelbase. 5'x4.5' rim bolt pattern. |
| Jeep Wrangler TJ 1997-2006 - Windshield width 55'. Round headlights. Center Tailgate mounted spare tire carrier with brake light. Tailgate opens to the side. 93.4' wheelbase. Coil spring 5 link suspension. Equipped with both driver and passenger side air bags. 5'x4.5' rim bolt pattern. |
| Jeep Wrangler JK 2007-Present - Brand new design of the old Wrangler, new 3.8L V6 engine. Plastic front fenders and grill. Coil Spring 5 link suspension. 95.4' wheel base. 5 on 5' rim bolt pattern. Three Piece Modular hardtop. 2 door and 4 door versions. |
| Jeep Cherokee XJ 1984-2001 - First uni-body Jeep vehicle. Suspension is mounted to the sub-frame of vehicle. Coil spring front suspension with leaf springs in the rear. Available in both 2 door and 4 door versions, both versions have the same wheel base. |
| Jeep Grand Cherokee ZJ 1993-1998 - Larger than the XJ Cherokee, optionally V8 engine. The first Jeep vehicle to use the Quadra-Coil design. Optional Quadra-trac II transfer four-wheel drive system. |
| Jeep Grand Cherokee WJ 1999-2004 - Replacement for the ZJ with modern lines, larger interior space by putting the spare tire under the cargo area floor. |