Re: is it worth it?
If your goal is 450 HP, I'll be the minority here and say to keep looking for a 6.2L. It's going to cost some $ to get the 4.8L to 450 HP. The 6.2L is 420-430 HP range already and if you want a cam in it well it's not that hard to get 500 from it. I'm not sure how much the 4.8L is but if it's not what you really want keep the 400 until you can get what you want. If your satisfied with the performance of a 4.8L (I would find one and take a ride in it), then by all means pick it up.
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