hello everyone...
I don`t understand this I thought that the intake and the heads better have similar size for best results (intake runner on heads and what`s facing it on the intake)
there is a difference in the size or the intake runner between the ls1 heads and the ls6 heads right?
so how does the ls6 intake fits the ls1 heads? and 2001 -2002 f-bodys came with ls6 intakes and the had ls1 heads as everbody knows but is it the same exact intake on the zo6 cars that have the ls6 heads? see how much I`m writing about this it`s a little

 

They are all basically the same. The LS6 intake just flows better than the LS1 due to the fact that it had larger volume.

 

Do some research (try the search button)... The LS6 intake will fit on all LSx heads (5.7, 5.3, 6.0).

 

Ls1 on the left ls6 on the right. The ls6 get its power advantage from the shape of the bottom. The ls6 can handle a larger volume of air.
http://www.ls1howto.com/howto/geniii...//IMAGE009.jpg

 

This link can be helpful when installing the LS6 intake.
https://ls1tech.com/forums/generation-iv-internal-engine/483587-7-piston-failure-fix.html

 

Larger plenum volume makes the LS6 intake flow better.

 

Thanks for your replys guys But ....

I know that they fit (ls1 on ls6 heads and ls6 on ls1 heads) and the difference in volume and it`s clear for the bottum of the intake shape ....

My question is Ls1 and Ls6 have different intake runner size on the heads right? so how come the intakes just just swap between them without any modification necessary to either the heads or the intake? isn`t it best if the size of the intake holes pefectly match the heads intake runner size? I`m still maybe the answer is simple but I don`t know it

 

You can port either if they dont match up.

 

My question is Do They Match?!(ls6 intake on ls1 heads) and if not if you match it isn`t it better or worth it?

and what about ls1 intake on ls6 heads if they don`t match and you directly bolt them on what`s the use of the larger intake runner size on the ls6 or the ported ls6 heads?

anybody thought of that question and got the answer?

 

anybody got the question and iterrested in the answer like I am?

 

Has 243 casting number,ls1 uses 241 heads . they say the 243 heads are better especialy with the sodium vales. I think the 243 has bigger valve but the intake runners are the same size on both heads just the ls6 intake flows more air into the heads. If your going with a big cam I would swithch to the 243 heads with the ls6 manifold and t/b. but a mild to medium cam just upgrade the valve springs and chrome moly pushrods with the ls6 and t/b with the 241 heads. hope this helps,
Nelson.

 

thanks for the feedback ....
it helps if you`re correct and I`m all wrong!
what I`ve understood from reading about ls1`s and ls6`s is that the valve Size is the same LS6 being lighter valves on the intake ... and the intake port on the heads are bigger (203cc or so on ls1 and 218-220 on ls6) .... anybody else? the subject isn`t the intake port size but if they`re the same then no meaning of this thread as I was completely wrong and the ls6 heads flow better because of the valves being bigger ....

but if I was correct then again the same question on the ls6 intake port size not matching ls1 heads and ls1 intake small ports on ls6 or aftermarket ported ls6 heads (people that put heads and cam heads being ls6 based and use stock ls1 intake saving money to get a fast 90/90).

 

Dude you are nuke-ing the **** out of this. Just put the LS6 intake on the heads. If you can afford it do a FAST 90. Otherwise quit worrying. You need to use some common sense. A LS6 intake will always out flow an LS1 intake...which usually translates into more power. GM used the same bolt patterns to save money and for interchangability. And the LS6 intake is a 212 cc intake runner.

Nate

 

 

me <----knows ls6 will make more power even if put without altering the ls6 intake or the ls1 heads

me<----not asking why it makes more power or worth it

me<---- asking if ls1 intake and ls6 intake have diff intake port sizes and if so read the above questions I`m tired of retyping the question in diff ways

Nate_Taufer <---- thank you for the info about the ls6 port size

 

I understand your question. What you want to know is if the LS6 manifold has a bigger opening where it meets the head, if so, then you would want to port match the head. It seems like the openings are the same, it's just the LS6 manifold has a difference with larger volume.