Technical exhaust crossover ?

I'm just put an Edelbrock performer on my 327 with camel hump heads - used felpro 1205 gaskets (these are performance gaskets that do not have a metalic backer). I had too many beers while I was doing it and didn't realize, until after I was done, that those gaskets have no hole for the exhaust crossover, but the intake & heads do.

Possible scenarios that could occur as a result include;
1. Nothing will happen, the gasket will hold back the hot exhaust gases
2. The hot exhaust gases will eventually burn a hole through it
3. The hot exhaust gases will burn through & escape to the top causing an exhaust leak
4. The exhaust gases will burn through & escape to the bottom side and go into the valley (this seems to be the worst case scenario)

Anybody ever do this? If so, what was your experience?
If you haven't, what do you think will happen? My plan is to run it and see, but if anything ugly or catastrophic can happen as a result of this, maybe I should pull it back off and remedy?
I was contemplating reaching down under the exhaust crossover plate with an exacto knife and cutting out that one side, but I can't do anything about the other side and am concerned that side will see the hot exhaust gases coming from both signs and being more susceptible to leaking.

Thanks

 

That's why I only drink after the job is completed.

 

Yeah, yeah...
If I didn't drink I never get anything done

 

I would not worry about it, if it doesn't work if costs you a set of gaskets, if you fix it now it costs you the same gaskets.

 

I don’t believe the crossover really sees any flow since we are not using the flapper valve to close off the one manifold as the factory intended.

 

I normally use the gasket that has a stainless plate sandwiched in that spot but have used them without it and had no burn through in a 6000 rpm circle track racing engine that required a stock manifold and heads. It did have minimal back pressure though.

 

Do you have a working heat riser valve in one of the exhaust manifolds?

If this was a used intake, is the exhaust crossover passage free and clear?

Does the vehicle have an automatic choke that depends on a source of hot air for the choke to open?

Is the vehicle driven in cold weather? Is it hard to start cold?

Have you ever had a problem with carburetor icing?

 

Take the cover off the EGR hole. You'll know when it burns through. Had that happen on a stock car that required using a Performer.

 

Good point, thanks

 

All good points...No, no, no, no and no

 

I’d use what you have for now but since it shows you live in New England in the winter you will have better drivability with the exhaust heating the intake more than the convection it will have now. I’ve looked at the construction of a performer and the exhaust heats the entire carb mounting area not just the base like an original cast iron manifold would.

I like a heated intake for better atomization and efficiency. Yes I know it lowers top end performance but we drive our car engine a 1500-3000 not 6500. Aluminum also looses heat quicker. So continuous heat does help. I know of guys who have an exhaust butterfly in service during the winter and disconnect the spring in the summer.

 

Well then, it sounds like you're good to go!

 

That's IF It burns through