YO7_A66 said

I have started assembling my 340/420 and I need to start deciding on which intake to run. I currently have the following two intakes:
Non-Airgap RPM
Weiand X-celerator (small single plane)

I have gasket matched both of these to the same intake gaskets, and the depth of the match is about the same for both. I have also matched the intake openings to the carb gasket on both pieces. My worry with these is that they were made for 318-360 cu inches when new and now even with the gasket match, I’m guessing that they will still be a restriction for the 420.

I am also trying to decide if the new Trick Flow single plane or the Indy 360-3R single plane may be better options too at about a $30 difference in price between them brand new. I know the Indy is quite a bit taller, but I am running a drop base air cleaner with about a 1” spacer under the carb with the current RPM intake. So, I am fairly sure that the 360-3R will not have a height issue under the hood (Challenger with RT hood).

My main concern with the top two are, if they are going to choke down the engine or not. My main concern with the 360-3R is if it is too big for a streetcar that will be maxed out at 6-6200rpms or so and has a solid lifter cam of 252/256 @ .050” with .603” lifts (before lash and geo loss).

My 727 Dynamic 9.5” converter was spec’d for my 340 with a 226/238 cam. So, I am assuming that the flash rpms will move up from 3800rpms with this new setup.

This is my street toy with no power steering or AC, and it has manual front disc brakes. So which intake would you suggest?
Thanks!!

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