truck int gaskets ar restricted by 50% and are usually in oh kits

Thoughts on completely blocking off the heat crossover; If you drive in northern latitudes other than right in summer, carburetor icing could be a problem.
It doesn't have to be freezing out to have carb icing, due to venturie air velocity. And if the exhaust manifold divertor is disabled  & the crossover completely blocked, isn't it going to at least partly disable your chokes operation? (assuming the choke isn't electric)  Unless it's a race engine, the truck semi closed gaskets might be a better idea ?  


Paul

It shouldn't damage the motor.  It may burn off the paint in that area.


Lawrenceville, GA

I did not block mine and I wish I had. The center area of the manifold gets 200-220deg.  Will this damage the motor? 

If you still have the exhaust flapper on the passenger side you may want to wire it open. With the crossover blocked it can rattle. Intakes like a little heat so I used the truck gaskets and wired my flapper open. Also keeps the passenger side from having so much condensation water. Good Luck.

56 Vic, B'Ville 200 MPH Club Member, So Cal.

I use  some thin stainless steel material that I had laying around. Doesn't neet to be very thick. I think an aluminum beer can would be a little too thin. As stated you don't want it to be very thick or it won't seal right .

I've used both tin cans and aluminum cans to make block offs. I've even seen some stuffed with a ball of aluminum foil.

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

I know about the gaskets and have a set but also have some gaskets with the regular size hole and want to use them up so I asked the question

Again, got a thickness that is ok?


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

you can buy intake manifold gaskets with the holes partly blocked, Concourse has them and many other suppiers. 

I used thin Aluminum to complete block Passage. You can't use too thick or the Manifold won't seal to Head. If You are taking out the Heat Riser You won't get really high Temperature Air trying to go through Passage.Thin Metal should be fine.