How many did you break and how did you break them?
2 350's and 1 305
1st 350 i shattered the crank shaft
2nd 350 spun a main baring
305 broke to much to list.....all doing the same thing........driving them fast....yet never even went above 125 with them.
the 340 in my Challenger.....well........it was unbreakable.
i did a constant speed of 125 plus(except stopping for tolls/gas) for over 24 hours.....on a few occasions, couldn't break that thing.