Port Matching

[Tony243]

I notice that a lot of you talk about Port matching your manifold(intake or exhaust?) with the runners. Are the runners smaller then the manifold? Can this be done in a 1.8 and what kind of numbers (hp) can i expect by doing this.

 

[not2fast]

in most cases it's not that one is smaller than the other, it's that from factory they're slightly offset. by matching them to each other it gets rid of the "lip" between the head and manifold thus reducing restriction. hp gains differ between every car. on your car where it's all stock you're not gonna see a d@m^ thing....sorry ...........do the basic mods first, intake, exhaust, ignition. then if you feel compelled afterwards do the port matching, then you'll see improvements after your engine can finally breathe...hope info helped.