yeah, thats because they are using 250shot of happy gas. anyhting will split if it isnt built right.. a 5.0 will run around 450 all day long. have him get a 351w then.. a basic build will get over 400 hp, without trying
Some 5.0's are stronger than others from what I've read though. The ones too look for are the Mexican "XXX" blocks, they have a higher nickel content (so I've been told) and are stronger. Just look in the lifter valley for the XXX stamping.