blocking manifold exhaust crossover?

[streetstang67]

I've currently got my heads in the machine shop, leaving me with an empty intake manifold...I was checking in out and found two holes that seem to act like a crossover, but they are black, like from exhuast? Is this for bringing air to operating temp? If so, can I block it off since I have an aluminum intake?

 

[krash kendall]

Your intake gasket set should come with plugs to block the crossover.

 

[streetstang67]

So I can block it?

Will it hurt anything?

Will I gain anything by blocking it?

 

[krash kendall]

The crossover is supposed to help warm the intake charge faster on cold mornings in colder regions of the continent for better combustion, lower emmisions, smoother idling, etc. Of course a warmed-up motor requires a colder charge for better performance. They made a calculated compromise between performance and user-friendliness by putting in the crossover.

No, you don't need it. No you won't hurt anything by blocking it. Yes your car will run better with the intake you're using.