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Message: <blockquote data-quote="the.greg" data-source="post: 1106859" data-attributes="member: 11226"><p>These bottom ends are good for 450ish rwhp before you need to worry. You wont get close to that with a kb on a b head 4v haha. Not without full supporting mods and meth and high boost atleast. Mine has 117k miles and runs strong. These 4v can take a lot of abuse, the major component is the tune. Make sure you pick a good tuner who knows their stuff, these kb setups aren't as simple as a centri, because they are much more rare some tuners may not realize how hot they get and may not tune conservatively enough. I made sure to say I wanted a very safe tune, plus I relocated the iat sensor which makes it safe because it allows the stock ecu to pull timing as it heats up. If you can afford the meth setup on top you will really see full benefits, but the most important part is the iat sensor relocation. I had a stock plastic iat sensor at first, but it started to melt from the high temps, which is why I recommend a ford lightning iat, because they are metal.</p></blockquote><p></p>