Not Ranked
Tom,
Aluminum C3 cases may be too weak to withstand much HP. I believe they were used behind automatics from the factory, where the cast iron unit was used behind stick shift transmissions.
A friend's Cobra ate one of the aluminum ones in spectacular fashion while just cruising the interstate and minding his own business. Admittedly it already had some spirited use behind a fairly tame small block plus some track day exercise. He has since switched to the cast iron version.
Just a heads-up.
BTW, your disclaimer about the speech-to-text app gave me a good chuckle.
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Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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