Originally Posted by huntersmith57

hello i took out a 351m and insalled a 400m in my 78 4x4 the 351 ran better than the 400 the only thing i did to the 400 was a intake ,carb and headers the mastake i was told was the 400 needs more compression to make them run i only had it in my truck for abot 3 months went to a 460 that was the way to go mike any questions email me huntersmith57@yahoo