NEW Holley dual quad dual plane with rails, TBs, linkage
 

New/never used Holley 300-121 dual plane dual quad cathedral port EFI intake with rails, seals, and hardware (bolts). Is dressed with twin 112-577 billet 4150 throttle bodies (TPS and IAC included on both), and pairing linkage between them.

$1100 to your door.

Couple more pictures.

Perfect for nostalgia hotrod LS swap... Tri-five or Deuce coupe would be sweet with this atop.

PM with interest.

I have always wondered how an intake setup like this would work. Why are you not using this? Unforseen issues?

No issues. I bought this stuff after the magazine test on the carbureted version showed 50 more ft-lb than Victor Jr and matched peak HP.

Really just getting away from it to go back to DBW. Also was informed my cam grind is more suited for big plenum and long runners of an OE architecture intake than this dual plane short runner deal.

What magazine was this in? I would like to see if I can find it online. I have never had luck finding anyone using this type of setup and also wanted one

Aforementioned dyno article.

http://www.superchevy.com/how-to/pro...-build-part-5/

Do you have any wiring for this setup?

Got same question in PM from other people, I should have posted reply publicly..

Since the two levers are tied together and operate simultaneously, throttle position on one will be throttle position on the other, right!? So just run typical ls1 harness to only one of the TPS sensors.

As far as IAC, I had planned to try to just make it run/idle with just one hooked up. If unable to tune that in, then figure out splitting to connect to both, however I'm optimistic I could sort it out just commanding one IAC. Worst case cheat the throttle plates open a tiny tiny amount on the TB that isn't getting it's IAC commanded.

Last topic on IAC, Holley used Chrysler IAC on these that are physically identical to LS1 IAC, however pins A and C are switched internally. So two choices to remedy are simply switch the two pin in yours harness at the connector, or unbolt these IACs and install LS1 items. I personally planned to just swap the pins in the connector.

So the overall answer is that no special wiring is needed.

Interested, but I have very limited hood clearance. I need to make sure it will fit before I pull the trigger.

Is there a measurement you would like me to take? These throttle bodies are shorter than carburetors, so that's a bonus with regard to your hood height issue :-)

Thanks, but I found the manifold and TB dimensions on Holley's website. Gotta add some for an air cleaner, too. This would be going into an LS1 powered Austin Healey sports car. It's pretty tight. I'll look at it tommorrow.

Man Id love to have it but it's just not the right time unless you're interested in trades of some kind.
The ideal IAC setup for that would be to use the one that I use on my roots blower by Blower Drive Service, You could plumb the two IAC ports into one IAC valve.

https://cimg4.ibsrv.net/gimg/ls1tech...23326f503e.jpg

Sorry, but it won't fit my car unless I cut a hole in the hood which I don't want to do. It's too tall by at least an inch, maybe 1 1/2" and I can't lower the engine any more without hitting the accessory drive. Sure would have looked good sitting under a Cobra style air cleaner, though.

I'm not shopping for much, but what do you have in mind? ...can PM me if you like.

Mid-week bump. Lot of guys wishing it was rectangle port!