The design of the Ford F-150 Pushrod ensures that the cam-in-block engine can open and close valves with rugged straightforwardness, providing dependable torque for work trucks. A lifter rides on the cam lobe to raise a Pushrod that tips a rocker arm. This lets an intake or exhaust valve open at exactly the right moment. This seals the cylinder and makes power. The early Ford truck generations of the F-150 had an OHV design, which means every cylinder had its own steel Pushrod. Later on, the modular V8 and EcoBoost engines in the F-150 line did an overhead cam design, which loses the Pushrods and instead uses cam followers directly on the valves. The main difference is in the number of parts and the height. In the OHV system, the cam is kept low on the block and a long Pushrod is applied. This is fine, but if the valve lash ever grows, that Pushrod can bend. So essentially, you lose some performance. In contrast, with an OHC scheme, the camshaft gets raised up, which shortens the path and avoids the bending risk. Wear that enlarges clearance in an OHV Ford results in extra lash that pounds components. Additionally, weak springs can allow valves to float. Further, a bent Pushrod ticks, causes a misfire, and robs power. As a result, owners shouldn't ignore any Ford F-150 problem that manifests. Instead, they should take action right away.
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