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Many people don`t realize how good a performer the 400 can be, check it out in the 335 Series- 5.8/351M, 6.6/400, 351 Cleveland forum: https://www.ford-trucks.com/forums/forum54/
I know you`ll be pleasantly surprised, I was.
Thats what Ryan was always telling me.
We had a 351m that was a decent motor, but kept blowing up after a rebuild. After doing some reading on here I found out it was a common problem on the 351m (cant recall the problem right now, and there is a way to fix it now, but we didnt know about it back then!)
That kinda left a sour taste in my mouth for the 351m-400! Guess I need another one to play with to get that trust back for them haha