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There is a little difference inbetween the two bellhousings. I recently did the C4 to toploader swap and I picked up everything from a local used parts contact. I decided to go with the aluminum, the cast one weighs a ton. I went to put everything together, when I found that there is a difference.

The flywheel I got was 164 tooth flywheel, and it would not fit into the aluminum bellhousing. So, I'm assuming that the aluminum bellhousing were for the 157 tooth flywheel.

I took the flywheel out and looked at the cast iron bellhousing and it fit just fine. Since then, I got rid of the cast for a lakewood.

So, I guess what I was trying to say was depending on the flywheel, that would determine which bellhousing you are going to need.

Member: Slightly Modified
66 coupe 302
66 fastback 351W
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