Small block 400's???

[b454rat]

400s went from 1970 to 1980. I had one that was a 4 bolt, 1973 I believe. 4 bolts were only made from 70 to 73/74, can't remember. But as mentioned, a 2 bolt made into a 4 bolt is stronger than a factory 4 bolt. I never heard that about later heads, I had a **** ton of heads from late 70s and into the 80s, never had cracks. Only had one run warm, but that was a 400 bored .040 over, highway was fine, but around town would warm up. Radiator was new, shroud, pulled a lot of air, but block couldn't transfer or radiate or whatever want to call it. Still ran good tho. I have a 400 block all ready to be put together. Just need the funds....