Hello

I need a little help
I have a 400 engine with edelbrock alu heads and a performer intake.

When you install the intake manifold would you block off the exaust crossover in the gasket or install the restrictors??The gaskets I have from felpro has an opening that can either be blocked off or left open.I´ts the opening that goes from the exaust port in the heads into the intake manifold. Should it be blocked off or left open.
Whats the difference??

Advice needed.

Jacob  

If you're driving the car mostly on the street and are concerned about quick warm-up I'd install the ones with the opening so you don't have hesitation problems from a standing stop and a cold engine. Ditto if you need to comply with emissions and/or plan to use a hot air style choke on the carburetor.

For pure racing, I'd install the ones that are blocked.
I have a '79 400 with #96 cast iron heads and a Q-jet. Changed over to electric choke and first tried with the "blocked" gaskets... had hesitation and poor drivability until warmed-up. Pulled  the intake and re-installed the "open" gaskets and am very happy with drivability during warm-up.

Good  Luck!
Kevin