![]() If the stamp numbers on the pad do not match the indicated format, then the engine/block was a "replacement" item. The referrenced website has them in alphabetic order. In the GM parts books, you had to look through each model year's codes (cars and trucks had different books!) to find what you might be looking for. There are some others, too, which I believe have links on that website, which have the various numbers and codes for inline Chevy motors. Has "build codes" and casting numbers on their website. I'm more familiar with small blocks than big blocks, but I suspect they are similar in where the date code casting is on the block. If you know the progression of what changes were made to the block castings and when, then you can tell a 1967 small block from a 1977 small block. On small blocks, this is a casting section, about the size of my little finger nail, with the format "MDY". The DATE CODE for the block is on the block's rear extension, on the flat part, about 1/2 way between the rear intake manifold's seal and where the transmission mounting is. This would include, but not limited to, power rating, transmission choice, emissions specs, and which models of vehicles it could be in for a particular model year. The reason I'm terming the code "machining/build spec code" is that this defines when the engine was "machined", or built, at what plant, which day, and for what vehicle's specifications. The other numbers, smaller and possibly "deeper" stamps, would be very near the front edge of the pad itself, were the last segment of the VIN of the vehicle the engine was installed in at the assembly plant. The machining/build spec code would be in the larger numbers more toward the front of the cylinder head. it's what's IN the block which defines it rather than the block casting itself. "Generic" as it could just as easily have been built as a normal 350 V-8 or a 350 LT-1 engine. I believe the casting number would be a "generic" 4" bore block. Prior to 1970, the machining codes were "two place" for the V-8s. That lasted for several years afterward but was finally totally "away from that" by the earlier 1980s. The "three place" machining codes started in 1970, cars were "C" and trucks (including pickups) were "T". ![]()
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