[Bill Edgeworth]

They are considerably lighter. The 26# I quoted earlier in the thread I think includes the weight of the case. So the exact difference I don’t know. It also depends on how you have them built McClay can build them with aluminum drums if you want to cough up considerably more money. However in a stocker he told me at best it’s only worth a couple hundredths as the 200 drums are already fairly light.
As for whether a 200 will hold up in your application I couldn’t say but they are being used behind Super Stock and Comp motors but I’m fairly sure in those applications they are seeing far more maintenance than would be expected in a stocker. Probably the biggest question is if the input shaft can take the torque of the big block. As Todd Hoven mentioned the input shaft conversion is a real good idea if you are going to run it behind a big block. And which big block will make a big difference in longevity also there is an awful big difference in torque between lets say a 402 and a LS6.