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I think you just hit on something here. The 5.2
version of the Magnum motor may be the ticket
to higher mpg. It's already blessed with a low-friction valvetrain and very efficient heads with
decent sized valves.

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It may have less friction out of the box compared to LA shaft rockers but the roller rockers on the magnum are an upgrade that is typically good for 10-15 hp on the chassis dyno due to less friction.

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My thoughts exactly!!