only issue would be the 318s thinner weaker main caps,.. sooner or later thats gonna be a problem spot when you get to making big power...but its a easy fix just throw on set of 340 caps or buy new caps and line bore them,...kinda needs to be done when planning big power any ways....DWB
that's one of my concerns is that the 318 is weaker at some point than the other blocks. Thank you for bringing that up. maybe someone can chime in that that is a weak point that needs to be addressed.