340hp 409 Intake Question

[BA-Man61]

Does anyone know what the largest size carb would be (AFB, or Edelbrock) that fits a cast iron 340hp 409 intake? I would prefer not to use an adaptor, and I'm concerned about interference between the intake and the carb's throtle blades.

Thanks in advance.

 

[Impalaguru]

I have an aftermarket AFB bolted directly onto the intake on my 63 340hp intake. No adaptors. I've never had any problems with throttle blades. If you do this, you'll need to pack the exhaust crossover holes with something like steel wool (what I did) or you'll have some serious fuel percolation. That AFB will suck the heat out of the iron intake pretty fast. If you don't want to do that, you could get a reproduction bake-a-lite insulator and stainless steel shim from a 300hp 327 application. I think you can get them through corvette parts dealers.
Ross

 

[BA-Man61]

Thanks,

Sounds like I need to go buy some corvette parts.