I was wondering what the differences between the V8 C4 and the 6C4. and do all C4s have removable bellhousings? reason i ask is am importing a bellhousing to fit a C4 to my bigblock.

Yes, all C4s have removable bellhousings, unlike the C6. The 6 and 8 versions weren't a lot different although it was visible. There was a good article is street machine a while back about a heap of autos and the diffences in between them all. Was actually reading it last night.

I can't remember the specific details, but I'll have another look tonight.