![]() These identification numbers are cast in to the part during the manufacturing process. When it comes to identifying cylinder heads, using every piece of information available is the only way to make a positive identification.Ĭasting numbers are generally found on many of the parts used by GM and Chevrolet as a reference to identify the whole assembly or subassembly. There are cylinder heads that have the same casting marks but have different sized valves. There are internal differences to each casting that can make a significant difference in the performance of the entire assembly. At a quick glance, the cylinder heads all appear to be basically the same. GM’s long line of small-block cylinder heads makes it easy for this engine component to be one of the most mis-identified components in the entire drivetrain. This particular head was used on SBC 350 engines produced from 1968 through 1970 which would indicate that the cast year was almost certainly 1968. ![]() This cylinder head has a casting number of 3947041 and a date code of J108 signifying that this cylinder head was cast on October 10, in a year that ended in 8 (1968, 1978, 1988, etc.). The date code stamp is directly under the casting. Casting numbers in Gen I cylinder heads are found near the valve spring seats under the valve cover.
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