Originally Posted By ScottSmith_Harms
Definitely magnaflux any 340. I've taken a part several that ran just fine only to find cracks upon teardown, most were in the lifter galley. They can crack from over heating,freezing, or just from too much stress/HP if raced. unfortunately it's pretty common.


I haven't had a 340, but how common is it? I have had several 318 and 360 engines and never magnafluxed the blocks?