LS* and general Chev V8 intake manifolds

[soop]

Righto, Hello again.
Sorry for the numerous threads, but I'm having some real trouble sifting through threads trying to ascertain a real answer to the following questions.

Out of all the LS* series engines, is there any physical difference in the design of the intake manifolds?

For example; Is there any reason why someone would want to fit an LS2 or L98 intake manifold to an LS1.

Will either of these intake manifolds physically fit the LS1 ports?

Would it be more advantageous to modify the existing LS1 manifold?

I ask the purely because the expense of purchasing an aftermarket manifold is so high it basically renders it redundant, given the relative expense of forced induction these days.

Again, I apologise for rehashing old topics, I've just found it very hard to get a real idea of whats going on with so many conflicting opinions being thrown about.

[H1GHROLLR]

hey mate the cheapest and best manifold thats is best bang for buck is the ls6 manifold bolts straight on and between 7-10rwkw i just got my ls6 manifold ported aswell and it made a 14rwhp gain i made a thread about it check it out it has pics too

[danja]

I know there were changes to the LS1 manifold over the years, the version fitted to the VT II for example was supposedly very restrictive, and a cheap and easy upgrade was to fit a VX-onwards manifold.

As to the differences between the LS1/2/3 manifolds, no ideas, but would not be at all surprised if there were changes. Given the LS2/3 are higher displacement I'd expect they flow even more air. No idea if they bolt straight up.

[soop]

Well, for arguments sake.
I have a VY SS II. Does anyone have any idea on what state the manifolds on these LS1's are in?

I'm quite prepared to Purchase some second hand LS* intake manifolds to compare if there is no one here who can shed any light on the issue. As always, it would be nice to know if any one can help. It would save my wallet from becoming bellemic....

[H1GHROLLR]

your vy will already have the ls6 manifold stick with that but change to a bigger throttle body around 85mm and if your really chasing horse power get it ported a little bit after all this you will need a tune but you might get 20 rwhp with the porting done

[soop]

I actually had a bit of trouble with the throttle body this morning.

I went to make my own CAI setup. But it seems I can't get any silicon hose to actually FIT the throttle body.
It is FAR bigger than the sizes quoted on here, as the 76mm silicon hose wouldn't fit it. I presume the sizes quoted on JC are internal diameter and not external. Is this the case?

[H1GHROLLR]

yer mate all sizes are the size of the inside butterfly basically

[H1GHROLLR]

check this out it might help you a bit ok
http://forums.justcommodores.com.au/...-them-out.html

[soop]

I've heared that larger throttle bodies can cause issues, and not really warrant the cost?

From what I've seen they can go for almost $2000. Which is VERY expensive for what gains they provide.

[H1GHROLLR]

yeah it is expensive but if you want the power you have to dig deep i just built a new ls1 and spent $9000 on parts but my mate builds race motors so all machine work and porting etc was free but all up theres like $16000 and it will probs only be good for around 460rwhp but oh well its all for fun i guess

[soop]

Yeah if i could get to 250kw@rw I would be very happy. Much past that and its more cost effective to go forced induction.

[H1GHROLLR]

not really mate because then you have to throw a lot of money into storng parts to make it realiable the motor i just built is to handle a s/charger all forged stuff it easy to build a s/charged motor that makes good hp but more expensive to build a big hp s/charged motor that lasts

[soop]

How strong are the LS engines in standard form. Can they be reliable with minimal boost pressures?

[H1GHROLLR]

they are fairly stong but you would still have to change valve springs cam etc then your still going to have problems with pistons,rods etc only reason i know is because my mate has had this drama with his vy ss better off saying money and doing it once properly otherwise you will be forever spending money

[soop]

Say i wanted to run 5psi.
Would the engine handle it, or would it be on borrowed time?

[H1GHROLLR]

it would always be feeling the pressure from the super charger and one day in the not to far futre would just decide to say nope i cant handle this and give up and when it lets go your up for just about everything brand new because the motor will be smashed