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There is some futzzing to do to make them work ... You have to drill holes in the bottom of the heads to connect the block cooling system of the 351m/400, and then block off the intake cooling system they used on the BOSS 302's... But the Boss heads where the first Canted valve heads that finally made it onto the 351c, which most all of the 351c parts will work on the 351m/400..
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
