Editing Cadillac engine knowledge (section)
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==Identification== ===Block casting numbers=== *1968-'69 472: 1486238 *1970-'76 472 & 500: 1485200 (1486200 was used on some 1974-'76 500 engines) *1977-'79 425: 1609110 *1980-'85 368: 1615255 Carb; 1620734 EFI ===Crank casting number=== *1968-'74 472: 1486424 *1970 500: 1495094 *1971-'76 500: 1496793 *1977-'79 425: 1609142R *1980-'85 368: 1609142 ===Stroke=== Stroke can be measured through spark plug hole if the engine will turn over. *1968-'74 472, 1977-'79 425, 1980-'85 368: 4.060" (less than 4-1/8") *1970-'76 500: 4.300" (more than 4-1/4") ===Head casting number=== Usually in the center of the head under the valve cover. *1968-'69 472: 1486250 *1970 472 & 500: 1495950, 1497902, 1486250 *1971-'73 472 & 500: 1497902 *1974-'76 472 & 500: 6024493, 6024552 *472 and 500 heads have the last 3 digits of the casting number in a recess under a center intake port, visible from the lifter valley with a mirror. *1977-'79 425: 1609112, 1609423 (last 3 usually on driver's front / pass. rear exhaust port) *1980-'85 368: 1615188, others unknown. The 4-6-8 head is substantially different than the regular head, and the rocker assemblies are not directly interchangeable. A fairly comprehensive 2 page PDF ID guide with pictures (mostly on the 472/500 engines) can be found [http://www.cad500parts.com/tech/EngineIDPages.pdf HERE]. For a quick ID, on the second page there is a box shape shown on the rear of the 1977-later blocks to ID the smaller engines. Distinguishing a 1970-newer 472 from a 500 can only be done by crank number, stroke, or piston design, as all other parts are the same.
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