These are not for your average run of the mill operation. These are for dedicated applications for those that are serious about taking their VG to a higher level of performance. These can be used for drag or road course. There are many variations of composition aluminum that can be used for different applications as well as design of the rod itself. For this application Im building for a customer he is doing full drag race setup which consists of filling the block with crete and we'll be doing my CNC cylinder heads as well.