Everyone, l wanted to know how I could block the exhaust ports on my intake with it being aluminum? It burns the paint off the intake and I also noticed sludge when I took the valley pan off. Hopefully you guys could help.

 

Pics below

 

Yes, you can. I understand thse say for a 455 but they can be used in a 350 also. Here is a link to the crossover plugs at Jeggs. They are available elsewhere also. Others have use a SS plate over the gasket to block them off also. The plates usually come with the fiber type gaskets.
http://www.jegs.com/i/Edelbrock/350/2733/10002/-1

SPECIAL INSTRUCTIONS FOR MARINE AND COMPETITION APPLICATIONS - PLEASE

NOTE: Any implied or expressed warranty is void
unless the “Special Exhaust Plugs” are used with your engine. These steel plugs are furnished with each Performer 455 manifold and must
be installed in the exhaust crossover port in each head. These plugs prevent cracking of the manifold caused by extreme heat of the exhaust
during extended periods of Wide Open Throttle. Use a file to finish and fit the plugs until they are a light drive fit. With a small hammer, tap
them into each head until they are flush (to prevent vacuum leaks). Additional plugs may be purchased under Edelbrock #2733. For Heavy
Vehicles (RVs, etc.) - Use the Special Exhaust Plugs supplied. However, drill a 1/4"-5/16" hole through each plug before installation.
This step is highly recommended for all applications!

 

Ok, I'll give those plugs a shot. If anyone else wants to chime in you are more than welcome

 

i used those plugs on my 455 and it will take more than a file to get them to fit .we used my bench grinder and got a nice fit ,but not perfect, i had tiny gaps between parts of the plug and the port in the head.after a trip to the dyno those gaps were enough to burn through my intake gasket and the plugs started rattling .(awful tapping noise i posted a video of it on here)after pulling the intake i used a high temp epoxy on them and the high temp permatex on the gasket around that port .so far it is holding up .ive read alot of guys have had sucess with the stainless plates.ive also seen were guys melt down pistons and pour it in the port to permanantly seal it .not an expert on this ,just my expierence with it . good luck

 

i used to use a cut-out a blocking plate made from the old turkey pan. I would shape it to fit in the gasket opening and seal it with silicone. did this on a few engines back in the day, and they never leaked as they were the same thickness as the gasket.