If that’s the case, then (according to Edelbrock in comparing the air gap to the PD340) there’s probably not enough gain for the expense (even used) of an air gap.
That’s the whole thing right there. There is no chase for an ET slip or maximum power output that can justify spending the money on a RPM AG over what he already has.
A member here (if not a few members) a while back called up Edelbrock and asked the important question straight out which was is it worth dumping your older LD-340 for the then New (ish) RPM AG in which the reply was No. Right out of the companies mouth. While the tech’s did note it would be a better intake than the older LD-340, the cost wasn’t worth the swap.
I myself hoping the pendulum was going to swing a bit more in my favor for testing such a thing. I have wanted to dyno test a few engines I have for the fun of it with a focus on intake manifolds. I have two engines about ready to be hooked up to the lie detector test with a few intakes to run for fun. But this is expensive to do and I’m not going to get all the testing done overnight!
What dual plane intakes do I have?
Weiand’s Action Plus & Stealth, RPM AG, Chink knock off of the AG and a D-64 dual quad. Also a 6-pack.
Why? Why the heck not?! I’m entertaining myself with this idea just for curiosity sake.