![]() By ensuring the mating surfaces of the intake manifold and head have holes that match perfectly will help air flow through the engine. The concept of port matching an intake manifold to a head is to ensure the flow of air to the cylinder is as big, smooth, and efficient as possible for maximum power. Then place the gasket, or phenolic spacer, on the intake manifold, then finish by using a scoring tool to line where you want your port matching to stop. First use a Sharpie to mark up the face of the intake manifold. This is an important detail to understand because if you use a tool to port too deep, then your parts may not pass post-race inspection and you may be handing your trophies to somebody else. The rules state you can port match the intake and the head, however, you can only go as deep as one inch into the intake or the manifold. Port matching can be completed on literally any vehicle, however how we port matched this intake manifold off of a Honda B18A1 engine was in accordance with NASA Honda Challenge rules. This process can’t be done while the intake is on the car. Step one for intake manifold port matching: take the intake manifold off the car and clean it up. Here is a cheap, NASA legal - at least in H4 - and easy way to find a tenth of a second: port match your intake manifold. Regardless of how the time is saved what racers really love about saving a tenth of a second is when they can do it and not spend much money. Maybe it is a tenth of a second from an engine upgrade. Maybe it is a tenth of a second from making the car lighter. Maybe it is a tenth of a second from a wider tire. ![]() They just want to be a tenth of a second faster than before. Generally, racers don’t care where the tenth comes from. Racecar drivers are always chasing a tenth of a second.
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