Originally Posted by MR_P_BODY
I have broke 3 cyl walls.. 2 of them on the same hole which was sleeved
and 1 on another engine... all been on 340 blocks.. thats all I run
wave


Just curious, would you speculate at all on the primary cause? RPM related load or peak cylinder pressure?

I ask because I am putting a 5.9 magnum in my 69 Coronet and am planning on E85 & 11-15 psi boost (no intercooler) I was planning shifting at 5500 rpm and the limiter set at 5800

I want to believe that holding the RPM down will help keep it together.