Quote: Lots of good advice. Just a question and comment. To the best of my knowledge, all 400's were made with cast crank. I wonder how it got a forged 383 crank and still stock bore?
Also a comment. The 400 is often compression challenged. With lowish compression and 400 ci, the small Summit cam may make you happier in terms of low/mid range torque.
If the 400 came out of a manual trans vehicle, it will have a forged crank. No manuals with cast cranks in a BB.
