Some info says that Sai5035 is the correct cam for the 50. I dunno.
Also, it appears that the big block engines have about 20 degrees less overlap than the 56 sized blocks, as in 70 degrees overlap for the 150 and 90 degrees for the 56. Not very many of the testers measured it.
This cam will fit the old 40:
https://www.horizonhobby.com/cam-gea...iijjkk-sai5035 Jim's part number will not.