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scott kraemer 08-11-2011, 02:16 PM i am restoring a 70 el camino i have changed to a 454 big block and not sure on the factory air conditioner housing is there a differance on a big block ac housing or will the big block fit without hitting the small block factory housing JJLT1 08-12-2011, 02:17 PM welcome Scott:texas: no i dont believe the evapoator box is different from sbc to bbc,,it will be very close tho.. but if your planning on tall valve covers,,thats when you may have a clearance issue.. bump:beer: lets see what the 3rd gens say for sure.. CANTED 08-12-2011, 04:00 PM Welcome to the club Scott. JJ is correct The evaporator case is not a problem, it does however make #8 spark plug a chore. As JJ said, if you use the tall covers you will have a small clearance issue at the brake booster. Enjoy that big block, it belongs in there. badger28 08-12-2011, 04:55 PM Welcome. When you get a chance I would love to see a picture or two. Sent from my ADR6400L using AutoGuide App | ||