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Discussion Starter #1 (Edited)
why does the lsx threads get locked ?they claimed a stock 6.0 with a cam and intake change will run 9's cause they heads flow over 300 on the intake...well you people are so full of crap..i checked with 4 different head porters and all the head producers and they do not even came close to flowing 300 in stock form, and asking many many racers , ford, chevy...etc..they all laughed , it is not possible to do that with only a cam and intake changed in that weight of car.., this is just one i checked with, the other are all withing 5-10 cfm, to get lsx heads to 300 they have to be worked over or aftermarket--updated...i was wrong on the head number it is the l92 that is the better head...more to follow

6.0 Liter heads casting number 317, Valve job done 2.0/1.55 milled .030

INT EX

.1-92 69

.2-169 126

.3-225 159

.4-263 180

.5-267 188

.6-268 190
 

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why does the lsx threads get locked ?they claimed a stock 6.0 with a cam and intake change will run 9's cause they heads flow over 300 on the intake...well you people are so full of crap..i checked with 4 different head porters and all the head producers and they do not even came close to flowing 300 in stock form, and asking many many racers , ford, chevy...etc..they all laughed , it is not possible to do that with only a cam and intake changed in that weight of car..just wanted you lsx guys to know that we did not fall for your lies, this is just one i checked with, the other are all withing 5-10 cfm, to get lsx heads to 300 they have to be worked over or aftermarket

6.0 Liter heads casting number 317, Valve job done 2.0/1.55 milled .030

INT EX

.1-92 69

.2-169 126

.3-225 159

.4-263 180

.5-267 188

.6-268 190

Its the NEW 6.2L L92 heads that come on the LS3 and L92 truck engines
that flow 300+cfm out of the box for about $1,000

Not the 317/243 heads, those are old LS6 heads basically,
and the above flow numbers look about right for them. Considering you
can pick up 317 heads for about $200, thats a lot of bang for the buck too.
 

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LS6 heads flow more than that.....Ive seen mildly ported LSx heads (cannot remember which ones, couple years ago) flow 260+ easily. Thats one of the many keys to the LSx success.
 

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Best as I can see, they were getting locked because of things seemed to resort to name calling to some effect.

I don't see why, for the name calling, but to each their own. But in that debate, it sure seemed the ford guys were getting it handed to them! lol
 

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LS6 heads flow more than that.....Ive seen mildly ported LSx heads (cannot remember which ones, couple years ago) flow 260+ easily. Thats one of the many keys to the LSx success.
The 317 head is the LS6 head with a bigger combustion chamber to drop
compression for the 6.0L truck engine they went on.

The 243 head is the LS6 head. Also came on the LS2
True Z-o6/LS6 heads had light weight valves is only difference for the Z06 heads.

With a little mild port work they will flow 300, if he was told they flow
300 in stock form, then .... yes someone was talking shyt.

People like that I just say "wow really ?" and dont believe another word they say
 

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Discussion Starter #7
maybe i got the head number wrong
 

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OH, ####....Im dsylexic or something.....I thought 190 was the headflow @.600 lift LOL! I didnt even think to look for both intake AND exhaust numbers in your original post. Sorry LOL
 

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Discussion Starter #9
ok i went back and read the post..ok it is the L-92 heads they are the better heads..i will get back to this later..and guys i am interested in this just form the in formation so please lets keep the name calling to nothing so this thread don't get locked
 

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Discussion Starter #10
Its the NEW 6.2L L92 heads that come on the LS3 and L92 truck engines
that flow 300+cfm out of the box for about $1,000

Not the 317/243 heads, those are old LS6 heads basically,
and the above flow numbers look about right for them. Considering you
can pick up 317 heads for about $200, thats a lot of bang for the buck too.
so where do i find the flow charts for them or a web site that has info on them
 

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Discussion Starter #11
here is what i found...copied from another site..wow
The box stock heads topped 330 cfm on the intake and came close to 200 cfm on the exhaust


Lift Intake Flow Exhaust Flow
(inches) (CFM) (CFM)
0.1 79.2 57.8
0.2 153 114.4
0.3 225 147.2
0.4 276 170.3
0.5 309.6 183.1
0.55 323.2 186
0.6 332.2 189.5
0.65 327.7 191.1
0.7 330 192.6
0.75 317 195
0.8 317 195.8
 

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Chevy hit a home run with those new L92 heads for sure.

They come on the L76 engine in Aussie, the LS-3,
the 6.2L L92 truck engines and on the LS-7 in a slightly modified version

There are some good technical artlc out there on them too.
Talk about the tricks they used designing the intake runners to
get those awesome flow numbers. The 2.16 intake valves dont hurt either.

You can swap them onto the big 4.0" bore 6.0L LS2 and iron 6.0 truck blocks too.
but not on to the smaller bore LS1's or 5.3 truck blocks.
 

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Discussion Starter #13 (Edited)
cheapest i found them for so far is 598.00 each assembled from the dealer but on ebay are super cheap..219.00 each bare from jegs--------another seller has them for 425.00 assembled
 

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Discussion Starter #14
i am at wow.....not over the LS motors but over this stock l92 heads freaking 2.16 intake valves ..
 

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Discussion Starter #15
Chevy hit a home run with those new L92 heads for sure.

They come on the L76 engine in Aussie, the LS-3,
the 6.2L L92 truck engines and on the LS-7 in a slightly modified version

There are some good technical artlc out there on them too.
Talk about the tricks they used designing the intake runners to
get those awesome flow numbers. The 2.16 intake valves dont hurt either.

You can swap them onto the big 4.0" bore 6.0L LS2 and iron 6.0 truck blocks too.
but not on to the smaller bore LS1's or 5.3 truck blocks.
the whole ordeal on the old post was that you use a 6.0 truck block , swap the heads to these, add a big cam and run 9's, after looking at these i dont see why not or very close to it, and the price...wow...
 

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the whole ordeal on the old post was that you use a 6.0 truck block , swap the heads to these, add a big cam and run 9's, after looking at these i dont see why not or very close to it, and the price...wow...
I don't see what all the fuss is about.The heads are great,but to run a solid roller everything but the valves are being replaced in the valvetrain.The shortblock is nothing special,so really it just boils down to the bare heads/valves being cheap for the flow #'s.Plently of SBF heads available used that can flow those #'s. People like to say 6.0 block, big roller cam and your going 9's,but that's not realistic with no compression and a "big" roller cam in a 6.0.
 

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Discussion Starter #17
still looks good, but i will stay with my ford, just thought i would share the info
 

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We will see I am trying to locate a ls3 motor right now. FTI claims some cubes and comp cam

I would really like to mess with one of these things just have to find the right deal.

Later
Tim
 

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We will see I am trying to locate a ls3 motor right now. FTI claims some cubes and comp cam

I would really like to mess with one of these things just have to find the right deal.

Later
Tim

Just get a 6.0L iron truck block and over bore it. Dime a dozen. called the LQ4 and LQ9 engine.
or look for the L92 truck engine. Iron block LS3 with truck cam and intake and lower compression.




I don't see what all the fuss is about.The heads are great,but to run a solid roller everything but the valves are being replaced in the valvetrain.The shortblock is nothing special,so really it just boils down to the bare heads/valves being cheap for the flow #'s.Plently of SBF heads available used that can flow those #'s. People like to say 6.0 block, big roller cam and your going 9's,but that's not realistic with no compression and a "big" roller cam in a 6.0.
People just like to make a big deal cause its an OEM part with aftermarket
performance. And fairly cheap compared to aftermarket heads too.

I think people running 9's on the 6.0 are neglecting to mention the No2
being sprayed. They will run high 10's n/a and 9's on the gas.
 
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