Why two labels on Motor?

[DaveNH]

I have a BX2200, on the block it has a label that says
D905-E-BX and on the head another that says D1005-E-D16.

Is the same head used on both the BX2200 and B7500?

TIA

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[JerryG]

Dave,
These are most likely engineering numbers. Engineering numbers are not to be used as part numbers, they are used by the factory to differenicate between different raw and semi-finished casting. The finished parts may fit several different engines and have different part numbers due to the final machining and or parts added to them. A single head can be and are normally used on different engines within their engine family or group. Having said all that, “I know absolutely nothing about BX’s”.