Originally Posted by zipper06
I don't know that there was ever a high nickel 400 block ever made and i've ran several of them, including the one in my car and one on the engine stand in my shop. 350's yes, 400's i doubt.
JMO
Zip.
the 509 was not the nickle block it was the 817 block from the same year... but like all 400's gotta be careful cause of core shift and make sure you got steam holes in the heads and gaskets
3951509
3030817++
1974 - 1976 400ci 2 Bolt Mains
++High Nickel Block