- Jan 5, 2013
- 54
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Well soon I'm gonna be ready to step up to a new engine and I really would like to get the ford racing crate engine.boss 427 with x head.but I noticed it says recommended max rpm is 5600. Why is that when it's built with all forged internals.just figured it would be safe to spin it to 6500-6800.any thoughts on this....and I know already those are small heads on that motor.