I want to know if any of the other LSx intake manifolds will fit onto the 5.3 LS4 block and will adapt to a IMPALA SS car. Price is no object but I don't want to change the engine.

 

same here I have a yearone mag and I see performance intake manifolds for LS1, LS2 and LS6. isn't our LS4 almost the same?

 

Another run at the top...

 

theres already a couple of post on this topic. the search buttons your friend.. but just to answer you guys questions simple and fast. No it wont fit .due to vac lines,Dod components,fuel rail ,injectors and a few other details.

 

search around here, its been done with a ls6 and ls1 i believe

 

http://i471.photobucket.com/albums/r...art_large1.jpg


LS ENGINES

Heads
4 basic types
Cathedral port - 15 degree valve angle, 3.89” minimum bore
LS1/LQ4/LQ9
LS6/LS2
Wide Rectangular – 11 degree valve angle, 4.10” minimum bore
LS7
Tall Narrow Rectangular – 15 degree, 4.00” minimum bore
L92/L76/LS3
C5R – 11 degree, 4.10” minimum bore, racing head
Notes:
All 4 types are standard 4-bolt per cylinder LS bolt pattern
Intakes
3 basic types
Cathedral port
LS1/LQ4/LQ9
LS6/LS2
Wide Rectangular
LS7
Tall Narrow Rectangular
L92/L76/LS3
Notes:
Each intake type has a unique port size, port shape and port location as well as a unique bolt pattern.
Intake type must match head type.
Blocks
5 arrangements
3.89” bore – 4-bolts per cylinder – no main web pockets
LS1/LS6
4.00” bore – 4-bolts per cylinder – no main web pockets
LQ4/LQ9/LS6/L76
4.065” bore – 4-bolts per cylinder – no main web pockets
L92/LS3
4.125 bore – 4-bolts per cylinder – has main web pockets
LS7/C5R
LSX Block – 6-bolts per cylinder – has main web pockets
Bore range 3.99-4.25
All blocks have the std. LS family head bolt pattern minimum
All LS blocks have same size main journals, cam bearing sizes, front and rear bolt patterns, etc.
Earlier model LS1 engines have some unique features, for these features, see the High performance LS1/LS6 V8 guide (p/n 88958786)
Note:
The LSX 6-bolt head pattern is based from the standard pattern, with the additional 2-bolts per cylinder – ANY LS BASED HEAD WILL BOLT ONTO AND WORK WITH THE LSX BLOCK

Cams
3 types
.500” valve lift or less
Stock LS1/LS6/LS2/L92/L76/LS3/LS7 springs work
.500” up to .525” lift
Requires use of LS6 valve spring p/n 12565117 or 12586484 (non-LS7 Heads)
Stock LS7 Springs are ok to use
.525” up to .570” lift
Requires use of valve springs p/n 12586484 (non LS7 heads)
Requires Hollow stem valves (kit p/n 17801930 for LS1/LS2) for optimized valve control (non-LS7 Heads)
Stock LS7 Valves and springs are ok to use
.570” thru .591” lift
LS1/LS2/LS6/LQ9/L76/L92 heads – These cams will only work with aftermarket springs/retainers/keepers
Stock LS7 valves and springs are ok to use
Rocker Arms
4 basic types
Cathedral port heads - LS1/LQ4/LQ9/LS1/LQ4/LQ9/LS6/LS2
Intake and Exhaust rockers are all the same – p/n 10214664
1.7:1 rocker ratio
Wide Rectangular – LS7
Intake and exhaust are different
Unique rockers to the LS7 head – will not work on any other head
1.8:1 rocker ratio
Intake rocker p/n 12579615 has offset
Exhaust rocker p/n 12579617
Tall Narrow Rectangular – L92/L76/LS3
Intake and exhaust rockers are different
1.7:1 rocker ratio
Intake rocker p/n 12569167 – has offset
Exhaust rocker p/n 10214664 – no offset, same as cathedral port heads
C5R – Unique head, requires Jesel or T&D shaft mount system
Note:
Stock Rockers for all LS engines are NOT adjustable.

 

Port and polish your own and you wont have any issues. Also with the right company doing it you could have as much flow as those other intakes are very close.

 

If money isn't a concern, you could probably get a FAST cathedral port intake manifold on this engine if you modified the power steering pump resevoir location and did some heavy modification to the alternator bracket (in addition to the other stuff layed out in other posts). For me, the cost/effort/benefit equation pointed to the LS6 manifold, and most of my posts are about that swap. That equation could work out differently for you.

The LS4 intake manifold is crippled by an approximately 50mm throttle neck, a small plenum, small and nearly uniform intake runners (the LS6 runners taper down to increase port velocity), and large support posts. For the forseeable future, having Fasterproms or someone else port your LS4 intake is the only bolt on solution. They open up the plenum and intake runners a lot, but the neck still chokes down to about 2/3rds the size of the throttle body.

 

Can this be modified to correct this or can fasterproms are some one else make a intake for us for a group buy?

 

A few things. Fasterproms offers porting for our intakes. It will provide about 8-10hp gains. The bottom line is our intake is horrible and compared to ANY other ls intake. Even a ported one is crap compared to an unmodified ls1,2,6 intake. ls1 and 6 intakes can be put on our cars but it will require some modification. There are MANY other treads that discribe all this. If you have any questions i would suggest looking through those threads but feel free to pm me

 

This question has been stuck in my head, and I don't see why not. WilliamGT was able to get together a set of headers, and if anyone was willing to find a speed shop looking to grow their business a kit shouldn't be a problem.

I've also been looking around and fuel rails, and there are some that use AN fittings and a braided steel line to connect the two banks, so they would clear a manifold of any height. As clean as your car looks, I think they would be great looking. This site is one of the first Google kicked up:

http://www.msperformanceonline.com/14106.html

I'm also wondering if an ls2 fuel rail would work. I haven't found a good post on here comparing the fuel rails (some poor guy asked and had no responses in the Gen IV section), but I have read in a couple forums that the LS2 uses shorter injectors than the LS6 (but no really reliable source). If anyone knows anyone with an LS2 car, it would be worth looking.

All the kit would need is a modified LS6 manifold, a modified or non-DOD valley cover, a TB adapter or a new TB that bolts up, a fuel rail, and all the hardware, fittings and vacuum lines.

 

i know this might sound dumb but has anyone tried to put the ls4 intake on any other ls motor? just curious what the power drop would be.