Chev rear engine mount photos needed.

[BSM]

Originally Posted by Lynn Eades

Rod with regards your question in post #4.
Here are some thoughts;
Maybe the reason for the bolt going from top (early) to bottom stemmed from the idea that it is better to have the bolt head at the top, where gravity tends to assist in keeping it (the bolt) in place. (if the nut falls off, which is better that loosing the bolt, when the nut falls off, from the top)
Then maybe, because of damage to the bolt (or an important mechanics head) and with ground clearance a consideration, a wise GM engineer (ex Ford)decided that with a castle nut and split pin, the bloody thing can't fall off, "so we will fit them the other way up" (good stories have happy endings)

Lynn thanks for the comment. I can certainly see the logic in your observation and would agree in principle however and given the tubular configuration of the actual mounting I suspect that subsequent operational experience/s convinced some bright mechanical engineer that the optimum location for the spring was on the top.
No doubt an AEME/REME/Canadian Version official notification will surface in due course outlining the reason/s for the change. Always room for another little mystery!! Rod