Exhaust manifold heat crossover plugs

[akart]

Originally Posted by stanski

Are you blocking them to save the paint on the intake or for other reasons?

I have read extensivly on the pros & cons of blocking the crossover. Seems it was put in for smog to warm up the manifold quicker and is needed for some auto choke units,I have a manual choke. A lot is done to cool the carb to prevent vapor lock. Edelbrock RPM Air Gap manifolds have no cross over and states that the cooler manifold creates more HP, also spacers are used on the carb to keep it cool and prevent vapor lock and hard hot starts.
I have an aluminum manifold and it will warm up quick enough and don't want the exhaust gasses in the intake manifold. Will see how it goes...