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Message: <blockquote data-quote="98-5.0" data-source="post: 434939" data-attributes="member: 9042">408s have a way better rod to stroke ratio...they are thicker....better webing throughout...way thicker main caps and bigger main...thus to handle more power.depends on the power output....i see way to many guys puting down in the 700's with stock roller shortblocks....it depends on tune....and much more....how its built...its hard to say...now if your only lookin for 500-550 i wouldnt worry one bit about it spliting ...i would rape it to 7k all day if it was put together nicely.....but thats just me....my motor is a 84 block 418 with trickflow 205s and 600-650 crank power...im not worried one bit about breaking it....not one bit....and ill be shifting around 7000 rpm....my $.02almost forgot.....mine is n/a power....boosted power and nitrous is a big killer for block strength...the sudden hit of boost or shot of spray will cause one to come apart...n/a power is much more forgiving in other words( somthing else to consider)</blockquote>