Originally Posted by
SS LS1
Not arguing but drilling, milling, grinding whatever for cooling doesn't cost anything either, just like removing the center ring, but it is no longer allowed. So the cost reasoning is not a valid reason to use IMO.
There is a cost associated with any permanent modification to the motor. You might be willing to pay market price for a used motor with a can that was hacked up with a dremel tool but most guys would not. Certain guys have the talent and tools to properly mill a can, but what about those that don't? They would be left to purchase the aftermarket can with pre-milled cooling holes or pay someone to do it for them.