Originally Posted by CamBirdRacing
I think 5130 is the best one GM makes. Don't think they make any 4130.
I said 5140.
http://viewer.zmags.com/publication/...#/0ede9029/260
Page 258, p/n 3963524
And yes, GM makes 4340 cranks, same page in the catalog.
Where in the world did you get your steel numbers from? Neither one match any materials I've seen used in a crank.