Hi,
I have a holley street avenger 670cfm carburetor. I just noticed when i pull to full throttle, the idle cam screw hit the plate in the intake manifold. If I remove the plate it seems that is covering a hole. Is there a way to get around it? Se pictures below, with and without the plate.

 

If thinner metal would fix the problem, make a thinner copy of the heat riser plate. If you have aluminum heads without heat riser passages, it's not a critical seal

Which aftermarket intake is it?

 

Sorry for my delayed reply but I am not sure what brand but it is aluminum. It came along with engine when it was replaced. The other side of the plate have thicker part that it is the same shape as the whole in the intake.

 

This is how my manifold look:

The side hole is covered with the plate that is too thick.

 

Stick a piece of wire or something down in that hole. See if it goes into the head. If it doesn't then you don't need the plate at all really. Nearly all stock heads have that passage, nearly all aftermarket don't, so that's another way to figure out if you're likely to need the plate.

That passage in the intake carries exhaust from one side of the engine to the other, to heat up the manifold during cold engine starts & warm-up, to make the fuel evaporate in there faster. The hole in the head is a passage that leads through the head to the center 2 exhaust ports, and there's a passage under the intake plenum that connects the passages between the 2 heads. The little block thing can also carry a choke thermostat which would get warmed up by the exhaust the same way.

If you have a fast idle cam then the carb has a choke. Meaning, ideally you should try to figure out a way to install one. The piece you need for doing that looks like this.



That photo is an Edelbrock Performer. Since that manifold looks like a knockoff of that, the piece for that will probably bolt up. https://www.summitracing.com/parts/edl-8901 I can't tell from your pic whether it'll fit or not.

It mounts an early-mid-70s 2-bbl choke stat. Something like, 74 Impala 350 2-bbl should work. Can't use one for a 4-bbl because it operates the other way (one moves upward when it gets hot, one moves downward). https://www.summitracing.com/parts/smp-cv204 for the stat, https://www.summitracing.com/parts/amd-w-830 for the cover, you can make a link out of a coat hanger.

 

Start the engine without the plate, no noise and you can leave the plate off, loud noise shut it off and make a thin plate.

 

Thank you Sofa, Beeman.
i will check the hole in the am.

 

Hi again,
checked this morning. It did not go anywhere nor made noise as I turned on the car. 👍🏼