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Power Strokes
6.4 Aftermarket
A little update on my truck...
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[QUOTE="Fast-6.0, post: 1226744, member: 353"] Boost and Backpressure are most likely the cause of failure IMO. The OE rocker just won't handle it. Been there done that. Jared's truck saw over 100 psi of bp, so did Erik's and big surprise they both broke rockers. I'm sure JD's bp was pretty high those last few drag passes. The springs in JD's truck are the most the OE rocker can take. We've ran springs with greater force and they broke rockers. What Nathannial is referring to, is the springs will control valve float at 5500rpm, as we have tested that on a cam with substantially more lift and duration and faster lobe acceleration than any of the trucks that broke rockers. The spring wasn't the problem, the OE rocker is just junk metal and wasn't intended for the punishment. [/QUOTE]
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