so i've been looking for this intake too come out for the cathedral port heads and it seems like they have it in production and being made i read on ls1tech and it seems that a couple people are already running them. does anyone know anymore info on this intake?

This is the link to the 102mm intake on Holley's site.
Holley Performance Products EFI Hi–Ram Intake with 1 x102mm GM LS Throttle Body – Longitudinal Mount Plenum Top – For LS1/LS2/LS6*300-123

 

The Holley guy I know said they were behind on making the cath port version, but that were allocating machine time based on actual orders. In other words, if you want one, buy it from somewhere and they will cut it in order of purchase date.

IMO, they will probably perform like similar manifolds (e.g. big cam/high revving or don't buy it)

 

So the people that have them basically did a pre-order of some sort? im sure it is pretty similar to every other manifold but its a decent price for what they are and look awesome as well! so its like a win win.... win situation almost.

 

Yeah like said above when I saw this post I called up summit as there was no contact number on holleys website. The guy at summit didn't even have any part numbers in their system for the ls1 and ls7 hi rams. I placed a order for the ls7 one and he is gonna call me back Tuesday with a confirmation. In my situation if I can order one it will be awesome. I have a ls7 style headed 427lsx that I'm in need of an intake for. In my case only options for an intake are either car style or fabricated sheet metal intakes like Marcella or Wilson. I'm boosted so really doesn't matter what style intake I go with but def wanted something that fit nice under a hood of a truck. I was going to place an order with Marcella for one of his badass hi ram style intakes but now that holley just came out with this I'm actually gonna save like $3k! Lol

 

ya i dont even know if i even wanna go with this intake on my lil ol' 5.3 but i'd like to know more about it and here some experiences with it for when i go with a bigger motor. sounds like you got some extra spending money to me for your truck "Three6GMC" !!! lol

 

Lol yeah but the extra cash is just gonna go to some other part of the truck. I have alot done but still need a bit more on my build. I actually really wanted to go with the hi ram before but went with the ls7 heads so I looked elsewhere. I'm actually really Happy you posted this or else I would t have known the ls7 intakes were out.

 

They did the LS3 manifolds first, and those have been out a while (people are getting them on, etc.)

What is really cool about this manifold (besides the price) is that the upper is interchangable.

 

yea this manifold is very universal which is good for Holley and now that there making it for every set of head's is also a plus. i know alot of people with have them for there ls3's and l92's but i'd like to see it on a 5.3 personally just too see what it'll. i'm curious i guess.

 

The problem is the torque loss from it being a high rpm manifold. It might look cool, but its not a proper match for a big heavy truck with a little engine. Its design fall into this family of intakes(pic), Like said before (quote below)

 

yea i understand that and all i just like to see what it could do just for ***** and grins. i always here people say it doesn't go well with the smaller motors, it just no real story's of people actually doing so.