Generation IV Internal Engine - LS6 and L92 heads side by side

Look at how similar they are the only difference by looks is the intake ports. Its sucks becaus eall I need is an intake and I could be running or I could get a sheet metal one made but I really want to keep my stock look. U guys got any suggestions?

http://www.streetnstrip.org/forums/attachment.php?attachmentid=1928

http://www.streetnstrip.org/forums/attachment.php?attachmentid=1924

http://www.streetnstrip.org/forums/attachment.php?attachmentid=1925

http://www.streetnstrip.org/forums/attachment.php?attachmentid=1927



http://www.streetnstrip.org/forums/attachment.php?attachmentid=1926

Keep looking for the Holden P/N. I'm sure that you'll be able to get an intake by mid summer.

Steve

i was thinking of maybe tryin an LS1 intake just to see what happens

thanx 4 da pics
i was hoping to adapt a gm single plane since their ports are more
rectangle shape than cathedral

thanx 4 da pics
i was hoping to adapt a gm single plane since their ports are more
rectangle shape than cathedralu got any pics of the ports?

i was thinking of maybe tryin an LS1 intake just to see what happens



Good luck.
Nice pics though.

At first glance I was like "damn what are those heads sitting on to stay in the air?" Then I realized the picture was turned sideways and the heads were on top of eachother and on the ground. :eyes:

combustion chambers are different too.

combustion chambers are different too.yeah there 71cc i believe and these heads will only work with a 4.00 or bigger bore.

yeah there 71cc i believe and these heads will only work with a 4.00 or bigger bore.

i meant the shapes, the L92's are more kidney shaped.

Maybe an Edelbrock Victor Jr. could be modified to fit. It would take filling the floor and raising the roof to get it done. Just a thought.................

Richard :)

Maybe an Edelbrock Victor Jr. could be modified to fit. It would take filling the floor and raising the roof to get it done. Just a thought.................

Richard :)



I haven't seen this intake in person in a few months but you might be right.
I bet someone like TEA could work on something like that for you.
The have raised the floor on a few sets of heads.
Worth a shot.

Can you buy the truck intake for the l92 now?

yes u can

yes u can

part number?

Not to hijack your thread but...I'm guessing the heads are for sale now? I know the number works in GM parts direct but didnt know if you could actually use them.

Thanks
Nick
'88SS

to the top

Not to hijack your thread but...I'm guessing the heads are for sale now? I know the number works in GM parts direct but didnt know if you could actually use them.

Thanks
Nick
'88SSyes they are for sale i got mine about a month ago.

12580678 - l92 truck intake p/n...... :)

12580678 - l92 truck intake p/n...... :)


thank you... ive been looking for that.

any pics of the intake?
any chance of us getting the exploded view of it, with part numbers?? because we'll need the matching rails and such.....

btw, do standard injectors fit in it?

is there a GM part number for the intake manifold assembly (rails, injectors, ect...)??

One other thing... Do the rectangle ports really offer an improvement over the cathedral port? If not, then what makes the L92 such a desirable head?

I have a price coming for the aussie car intake, I should have it on Friday.

One other thing... Do the rectangle ports really offer an improvement over the cathedral port? If not, then what makes the L92 such a desirable head?the 2.16 intake valves is what kickass and so does the flow numbers compaired to a set of aftermarket heads that cost around 2000 for a good set. these heads cost 400 for a set but there bare. With a good set of aftermarket springs and the GM valves I bet u could be in these heads for around 800 complete.

I've tracked the LS2 402 shortblock fpor months with hopes of doing that swap along with AFR heads. Now this L92 head seems like a much better option, along with the larger bore short block. I hope you guys figure out the intake problem so we can all start doing this swap more easily. I think this will be the most cost effective swap in the coming year if an intake can be had to work on our cars.

Hmmmm so the only thing keeping all of us from running the L92 heads is an intake.

Will the LS7 intake bolt up to them?

Hmmmm so the only thing keeping all of us from running the L92 heads is an intake.

Will the LS7 intake bolt up to them?

Doesn't look likely. The L92 bolt holes are in the same location as the LS6 heads. The LS7 bolt holes are higher up the intake flange. Now, if there's some extra material to drill and tap holes for the LS7 intake...........

Richard :)

Hmmmm so the only thing keeping all of us from running the L92 heads is an intake.

Will the LS7 intake bolt up to them?


the answer is no.

the ports are different.
the bolt holes are different.
there is not enough material to make up for the differences.

currently the only production intakes that fit:

the 2007 L92 Truck intake
the 07 holden intake (not stocked or currently sold in the US)

One other thing... Do the rectangle ports really offer an improvement over the cathedral port? If not, then what makes the L92 such a desirable head?


Cause they flow like a mofo and are low in cost compared to the aftermarket heads that cost an arm and a leg.. :)

Heres some pics of the L92 intake and engine

http://www.autoblog.com/2006/02/21/gms-l92-and-ls2-v8-engines/

http://www.4wheeloffroad.com/featuredvehicles/0510tr_07tahoe/

Maybe it would be a god idea to post a sticky with the necessarry part numbers to run l92 heads. Some pn# to start with.

Heads (bare) #12582714
Truck intake #12580678
Holden intake #?
Fuel rail #?
Throttle body #?
Intake valve #?
Exhaust valve #?
Rocker arm #?

Maybe it would be a god idea to post a sticky with the necessarry part numbers to run l92 heads. Some pn# to start with.

Heads (bare) #12582714
Truck intake #12580678
Holden intake #?
Fuel rail #?
Throttle body #?
Intake valve #?
Exhaust valve #?
Rocker arm #?


really, we need a whole FAQ on it... including that.


EVERY SINGLE THREAD is full of the same questions.. some we have answers to, others we dont.
example:

Does the LS7 intake fit?? NO the LS7 intake does not fit.
do i need a new rocker arm locator strip?? we dont know yet, but very likely since the intake rocker has been moved.

really, we need a whole FAQ on it... including that.


EVERY SINGLE THREAD is full of the same questions.. some we have answers to, others we dont.
example:

Does the LS7 intake fit?? NO the LS7 intake does not fit.
do i need a new rocker arm locator strip?? we dont know yet, but very likely since the intake rocker has been moved.
got any pics of the intake?

got any pics of the intake?

witch intake and what do you want to see? :)

Cause they flow like a mofo and are low in cost compared to the aftermarket heads that cost an arm and a leg.. :)
tru dat! :)

I would really like to see a cutaway pic of the truck L92 manifold.

gun5I1ng3r,

Remember the "cathedral" portion of the port was simply for the fuel injector to be
able to shoot toward the back of the intake valve and be as close as possible to it,
it is not there for air to travel.

That L92 head is awesome, look how much the port is raised over the LS6...

witch intake and what do you want to see? :)I would like to see the pic of the new 07 tahoe intake

I managed to get ahold of 2 ls7 intakes new in the box

they are both for sale.

500 each plus shipping.
pm me

I managed to get ahold of 2 ls7 intakes new in the box

they are both for sale.

500 each plus shipping.
pm meTHE LS7 INTAKE WONT WORK

The guide bar for the rockers is L92 only, it has a slightly different spacing.

Kurt

Well I guess what we all really are wanting to know is if a Victor intake can be modified to fit it.

Well I guess what we all really are wanting to know is if a Victor intake can be modified to fit it.I got one on the way hopefuly it will work for us.

The guide bar for the rockers is L92 only, it has a slightly different spacing.

KurtAs long as we have the guide rail we can use the LS1 or LS7 style rockers?

As long as we have the guide rail we can use the LS1 or LS7 style rockers?

Pretty sure you use the LS7 rocker because the intake is an offset rocker.

Nate

does anybody know if the MLS gaskets from gm would work with the L92 heads? looks like the coolant ports are the same from the pics....kinda hard to tell though...

Can you post some close up pictures of the ports and combustion chambers?

does anybody know if the MLS gaskets from gm would work with the L92 heads? looks like the coolant ports are the same from the pics....kinda hard to tell though...

from what i looked at, the 6.0L gaskets will work just fine with them.

of course, my engine isnt together yet to know for sure, but everything seems to line up just fine..

from what i looked at, the 6.0L gaskets will work just fine with them.

of course, my engine isnt together yet to know for sure, but everything seems to line up just fine..

other than being designed for the larger bore...any reason (physically) these wouldnt work on a LS1/6 block?

other than being designed for the larger bore...any reason (physically) these wouldnt work on a LS1/6 block?


if you weld up the chambers and the valve seat area, machine the deck flat again and recut the valve seats for smaller valves so it fits in the bore.... yea they'll fit on there and work.

sounds like alot of work, but thats what i intended on doing, right up until i started pricing 6.0L shortblocks.... it would be cheaper for me to buy a stock shortblock then it is for me to modify the heads for the LS1.. but if i could weld and machine them myself, the opposite would be true.