Well, it blew due to conditions in the engine, not because it is defective. Well, that is a possibility. You have to check the head and block for straightness. This isn't an option. If it works, it was merely lucky to be flat.
I thought the Cometic is a MHG.
It is car mechanic electrical class 101 actually. This is what he would be teaching his students after they understand the very basics. Yep, cakewalk for the electrical engineer, no doubt.
What clicks?
If you are hearing the pluger activate but the engine does not crank over, or cranks over slowly, there is only a couple of things that can be.
1. Voltage drop. You could have a bad connection/wiring to the starter.
2. Bad ground. Not as likely as the starter is mounted to...
Why don't you stop passing along bad advice by ridiculing the correct procedure the shop is doing?
How many other 7M's have to go through a blown headgasket because the repair was not done correctly?
Even without the MHG, the block must be flat, or you will ruin the new gasket in time.
Your right, can't say 100%, but I can't remember a spec sheet for an alloy head that wasn't T 356 aluminum.
Magnesium is the main hardener I think. "Mag wheels" aren't magnesium at all, but aluminum doped with the magnesium to make them much harder.
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