JasonShort

iTrader: (242)

Exactly right!

These heads look very promising

Chicago Crew UnderBoss

iTrader: (1)

bcs

Anybody know if the heads will work well with a 408 with a 244/248 cam with 12cc pistons?

Bring the Noise

Any plans on having GMHP test these on the LS2 that had the previous head comparison. Say with the same 232/236 cam just to see where they are over the stock L92 heads.


One last question: With all the R&D that you have put into the CNC design have you designed a cam to go with this head for the different displacements?
Say 2 cams for the 364 to 376 range (stage I and stage II) and then 2 cams for the 402 to 418 range?

Oh and an Idea to make it easier on buyers.
Offer them (the ported heads) in a package set where you can pick the cam, heads, and a set of harland sharp upgraded L92 rockers arms.

verbs

and you send those people to Patriot Performance

Dale C

iTrader: (4)

I also have the same concerns I am starting on a 418 for a road race application .650+ lift that will need to be able to turn 7500 RPM and hold it. Are there any titanium valves available for these heads? How heavy are the SS valves.
Thanks, Dale

Stang's Bane

iTrader: (22)

Dale,

If you want to spend the money to have a set made and you have the time to wait, you can get anything you want. I don't think anyone has
shelf stock valves for this thing yet.

Keith

dame

iTrader: (3)

Intake runner size pease

Chad@LivernoisMotors

Whoa guys...thats alot of questions I'll be in the office shortly and will answer all of your questions, thanks for the interest!!!


Chad @ Livernois Motorsports

Billiumss

iTrader: (11)

$1795 is not bad at all for a good flowing head but these OEM heads cost next to nothing compared to what we had 2 years ago. The L92 flow better or equal to with no porting overall than most average LS1 STG 2 heads today.

Your a little off on the spring price, it's more like $150 for the singles they are selling, I have those springs on my car right now: http://www.motorsporttech.com/fbody_engine01.asp

So if we redo your math:

$150 for springs
$350 for both heads
$300 for valves
$100 GM seals, retain, locks
-------
$900.00 ~ give/take $75-100

So that leaves $895 (give/take $75-100) for a port job

These are way cheaper than a AFR head but these are OEM pieces not aftermarket. I'm just surprised that they cost over $1,500 for a $175/each OEM head, thats all.

I hope they sell well, and will probably do so.

383ss

iTrader: (14)

can we please get a complete flow sheet, .100 to .700 both intake and exhaust?

also, what about upgraded spring packages and possibly a solid roller setup?

thanks!

deputydog

Dont forget the stock rockers wont be reliable with anything over 150lbs of seat pressure especially over 7000rpm. I considered the heads for a pretty stout motor that I'm building that is similar to Tosto's carbed motor. The good news is that Jesel is now shipping shaft rockers for the L92 head ( I just got off the phone with them) bad news is they cost...$1625

Chicago Crew UnderBoss

iTrader: (1)

Definitely need pricing for a good double valve spring upgrade, good to at least .650 lift and I am very surprised that these heads would not automatically come with a PRC Gold or type dual spring good up to .650 lift.

Really interested to see how much power these will put out with a good matched cam in a 408 iron motor, 402 LS2, 416 L92, etc, etc. Its going to be a very exciting year 2007 for the LS series performance world!

Chalky

iTrader: (2)

Also curious to see some real world testing on smaller motor like LS1 vs 364 vs 402, etc. I just wonder if they will be to much for LS2 and smaller to be of any benefit.

Dragaholic

iTrader: (180)

You need at least a 4.00" bore to use L92 heads. A LS1/LS6 block wouldn't work unless you sleeved it.

Chalky

iTrader: (2)

Good point on LS1/LS6. Still wonder if these heads are overkill on anything smaller than 400 CI.

Chad@LivernoisMotors

Here are some numbers for now...working on answering everyones questions right now!!




Livernois Motorsports L92 Heads

pewter01z

iTrader: (44)

what about deck thickness. Comparable to LS1/LS6 or thicker like some of the aftermarket brands?

WizeAss

iTrader: (5)

this is a question few have answered.... heck I dont even know the factory specs on this.

also the exhaust numbers have me concerned..... I am starting to see why some are running huge *** splits in the cam selection

budget LS6 heads flow 300cfm intake and 213cfm exhaust at .600 lift...... considering where your cnc program is taking the exhaust flow......... I wonder if there is an issue with backpressuring the valves without serious exhaust work???

How do you compensate for this in cam design (just lift and duration, not looking for expert technical advise here, since I am still a newb)

Chad@LivernoisMotors

Thanks for all the interest and questions guys! Let me post something that will clear some things up and hopefully answer all your questions.

Another update for everyone. We will offer FOUR stages on L92 heads. Stage 1, Stage 2, Stage 3, Stage 3R.

Stage 1 are assembled with Comp Springs, Manley Valves, GM Retainers. They are NOT CNC'd. These heads are offered at $1395.00

Stage 2 are assembled with Comp Springs, Manley Valves, GM Retainers, they are CNC ported with Valve job, milled, Seat blend, etc. These heads are the ones pictured on the website. They are offered at $1795.00

Stage 3 are assembled with Manley Dual Springs, Manley Valves, Manley Titanium Retainers. They are also CNC Ported, Valve job, Milled, Seat Blend, etc. These heads are offered at $1995.00!!

Stage 3R are to be determined yet but will use a larger valve. These are for you guy's with LOTS of cubes, lots of boost, etc.

These heads flow some great numbers and are assembled with GOOD parts. You can't beat the price guys! We do plan on making a specific head/cam package with these heads soon. The deck thickness is 1/2". As of now we dont offer the CNC job for customer supplied heads. I would answer all of your questions individually but we'll see how much this update clears up. If you have any questions, please post, or feel free to call. 313-561-5500



Thanks,

Chad @ Livernois Motorsports