The NV3500 is used behind the 4.3L V6 and light duty V8 applications. In my opinion, even the mildest big block in a full size car would cause it to become shrapnel. The NV4500 is stronger, but the ratios are all wrong for car use. See
http://www.nv4500.com/newsdesk_info....newsdesk_id/30

Bob