it's not that i get insulted.I do agree that a 421 is out of the ? But a strong 406 is a nice motor for the average guy running low 11's to low 10's .
what's the H/P limit,Is it 600hp 550hp? If you have a nice block. Splayed caps,studedmains ,studed heads,and rok block
That motor that lost the mains (
http://forums.racingjunk.com/viewtopic.php?t=8335)In this thread must have been making lots of power,But how much?