Originally Posted by MXD
I haven't heard of many (or any for that matter) blown 6.2s or 3.5s. This is the first I've heard of it.
There's been a 3.5 eco blown on this forum. Sent a rod threw the block and the owner states it was never modified. I'm not sure we ever found out the problem for the engine went back to ford.
One thing to consider is that the 3.5 and 6.2 were both built to work, not for performance. The 5.0 started as a performance engine and was reworked slightly for work duty, bigger exhaust valve stems(or sodium filled? I don't remember), lower compression, etc.