Area47

bolt pattern
different?
same?

in short, im tired of playing around

SILVER LS4

Just to add to this, I still wonder if a LS2 intake will bolt on to the LS4, and work with little or no other modification. It may sound crazy, but I've heard it may work. I am still looking for a larger gm maf sensor that has the same connector wire pattern. The LS2 has a diff wiring connector. I have yet to check the ls2 wire diagram. I am sure it could be done.

Area47

well im not worried about the tb itself. what im wondering is the bolt up. i know some of the ls2's are 4 bolt. this will play heavily on what i do in the future.
the ls4 is 4 bolt, just trying to match something up

SILVER LS4

The bolt pattern is different, the LS2 is much larger/bigger pattern. There is a vett and a ss trailblazer here. Interestingly the Trailblazer SS has a truck intake manifold, and the throttle body for the LS2 in the SS and the 5.3 in the reg Trailblazer have the same part #'s, and are large, At least the SSTB is. Now the 5.3 motor in all the trucks seems to have the same part # mass air flow sensor housing. The Trailblazer SS has a diff/larger MAF housing. I hope this makes sense, it barely does to me. I would like to sit all the ls powered cars and trucks next to each other and compare intake components. I slowly have been doing this over the past few weaks it seems.

BADDLS1SS

iTrader: (22)

Were talking 90mm vs 75 or whatever... the bore isnt going to grow within the bolt pattern for something like that. The LS2 ETC looks physicall diff plus the plug ins are diff.

Area47

well, it involves bolt pattern. the size isn't a concern to me right now, i can work around that

BADDLS1SS

iTrader: (22)

I think the intake is the least of the worries when it comes to making a decent HP gain on these motors....

This is like gaining 15hp from a fast intake on a modded motor... not worth 1G to me for something i wont even feel.

Put a cam or rockers in it if you wanna stop dicking around.

SILVER LS4

My goal is to find GM parts that will work on the ls4, since there is not much aftermarket stuff for this vehicle. It seems that if it would ever come time to do more serious mods, the intake system may be a week link. If an ls2 intake would bolt on (and function properly) that would flow plenty for the little 5.3 even if cammed with ported heads... Then the big throttle body would of course fit. The maf/iat housing is another issue. Since both the ls2 and ls4 maf/iat contain the same sensors, maybe some clever wiring would make the ls2 maf/iat housing compatible with the ls4 (since the connectors are different). If all this were to work, the ls4 intake system would no longer be a weak link and the little 5.3 could be quite a screamer. Then there is the trans issue. Well there a lot of aftermarket stuff out there from the years of the super charged 3.8s running around.
Thats all I have for now, a little slow at work today.

Area47

oh trust me, im not playing around now, suspension stuff has been ordered among various other things. should be mid 12's with ease. the fast is pointless on our cars. you can get air in, the problem is getting air out. ie cam.

i may wonder down to the warehouse later and take a look at some stuff


the ls2 4 bolt tb vs ours is what im after {the tb bolt pattern} will play a huge roll in what i do

p.s. there is a turbo ls4 now.

nighthand

You guys are my heros

SILVER LS4

I wouldn't swap the intake manifold alone to gain power. Just being hypothetical mostly. A larger iat/maf housing with the same plug as the ls4 is what I would like to find but looks like may not exist.

Area47

someones gotta do it

Area47

anyone wanna do some quick measuring?!?!

i have the numbers off the ls2 4 bolt tb. i hope to god it's the same as the ls4. id measure it, but im stuck in a cube at work right now.

SILVER LS4

Yesturday I was eyeballing the diff in the tb's. The ls2 bolts are about 1/2 inch farther apart than the ls4 across the top. I actually marked them on 2way radio antenna. Let me know what you want measured exactly if this doesn't answer your quesion.

Area47

i may just wait till i get home, basically the measurements from top to bottom ont he center of the bolts
and side to side, center of the bolts
but if ya wanna measure it, be my guest!

Area47

blah!
my fun is ruined.. BLAST!

ls4 vs ls2, the ls4 is about an inch short all the way around

SDfbody

I was told the LS4 TB and Cobalt SS supercharged TB are the same except the LS4 is a little bigger. A LS4 TB will bolt right up to a Cobalt.

Area47

im checking 4 bolts off older trucks to see what i can do. there is a reason why im doing this.
you'll thank me later

SILVER LS4

Well I looked at an 01 tahoe and an 07 old style pickup, both have 3 bolt bolt pattern. Let me know what you had in mind and I might be able to see (measure) one. A new style 07 avalanche has a smaller 4 bolt tb. I know the maf/iat have diff part no.s also, it may be larger than the ls4's and has the same connector as the ls4. I just can't go get one and start tearing it apart, yet.

Area47

they are larger then the ls4.
we have a tb spacer instock measured it. not gonna work