Do the plastic replacement intake manifolds for the 4.6L flow better than the factory aluminum ones?

Asked by FordFan711 Dec 17, 2018 at 12:56 AM about the 1997 Ford F-150 XLT Extended Cab Stepside SB

Question type: Car Customization

The motor seems to be starving for air, so, I am curious about if I replace the
intake manifold with the plastic one, will it flow better?

3 Answers

FordFan711 answered 5 years ago

Nothing significant. It just seems to be struggling to build power. The exhaust has been checked ... no restrictions. I am used to the performance of a carbureted engine, and this engine just seems extremely "gutless". The truck has a 3.55 rear gear and it has NOTHING out of the hole. I've had cars with 3.08's with a better launch than this truck.

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F_O_R answered 5 years ago

The 4.6 is a short stroke engine that does not have a lot of torque. The 5.4 is a great engine.

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