They probably were not that good, but they were better than all the 326, 350 389 & 400 cast rods.
I just know this because I used to try & find some 421 rods for my friend.
It used to be slim Pickens when it came to finding a good Pontiac rod that seems not so long ago.
Now there are aftermarket rods available & much better aftermarket cylinder heads.
MBHD
