[olddog]

I will not advise on the Toque in you application, but you need to make sure that the threads on the fastener are the right length, when dealing with aluminum.

For a steel bolt I believe a rough rule of thumb is one bolt diameter of threads is needed to hold maximum torque. Aluminum being softer and it creeps (flows) over time requires quite a bit more threads. I recall some years back a fellow used a bolt kit for a cast iron engine, and the threads pulled out of his block eventually.

My advise to you is to get your data from an expert who builds these engines.