Go Back   LS1TECH > LS1-LS2-LS3-LS6-LS7 PERFORMANCE > Generation IV Internal Engine
Sign in using an external account
Register Forgot Password?
Search

Generation IV Internal Engine
2005-2014 LS2 | LS3 | LS7 | L92 | LS9
Sponsored by
ERL Performance

L92's, buy bare or complete for high lift cam?

Reply
 
Thread Tools Search this Thread
Old 09-30-2008, 01:40 PM   #1
TECH Enthusiast
 
tennerv8's Avatar
 
Trader Rating: 7
Join Date: May 2007
Location: Mn
Posts: 701
Default L92's, buy bare or complete for high lift cam?

I want to get a set of L92's for a future build. I want to run a larger lift cam (closer to 600 lift). Is it cheaper to buy the heads bare for $200 each and then buy the valves and related parts and higher lift valve springs? Or do I buy the complete L92's for $400 each and then just buy higher lift valve springs? This is a low buck build so if I could save a few bucks that would be sweet. Thanks fellas.
tennerv8 is offline   Reply With Quote
Old 10-01-2008, 04:52 PM   #2
9 Second Club
 
camarols1's Avatar
 
Trader Rating: 17
Join Date: Oct 2006
Location: NW Chicago Suburbs
Posts: 684
Default

What is the intended usage of the vehicle?

For a n/a build, the assembled L92's with a spring upgrade to match the cam would be the most economical.
As long as you are keeping a reasonable max RPM in mind, the stock valves would be ok.

On the other hand, a max effort FI build would benefit from a set of higher quality valves so it would make more sense to buy the heads bare.
No sense in buying parts that will not be used.
__________________
79 Camaro 6.0 twin s366's
best so far - 9.125@148.35mph - getting there.....
http://youtu.be/xlaD35oRQtU?list=UUF...p3ArhB91JKqcWQ
camarols1 is offline   Reply With Quote
Old 10-01-2008, 05:04 PM   #3
TECH Regular
 
ItsNotStock's Avatar
 
Trader Rating: 24
Join Date: Aug 2007
Location: Billings, Montana
Posts: 448
Default

Definately buy them assembled. You don't want to know what even the stock valves cost...
ItsNotStock is offline   Reply With Quote
Old 10-02-2008, 08:42 AM   #4
TECH Enthusiast
 
tennerv8's Avatar
 
Trader Rating: 7
Join Date: May 2007
Location: Mn
Posts: 701
Default

Yeah I just want to do a inexpensive carb build-up to thrash on. I will not be reving it much past 7 grand. I think I will get them already assembled. Whats a good behive spring to get? My cam will have a max lift of .573 Could I get by with some sort of beehives?
tennerv8 is offline   Reply With Quote
Old 10-02-2008, 11:47 AM   #5
9 Second Club
 
camarols1's Avatar
 
Trader Rating: 17
Join Date: Oct 2006
Location: NW Chicago Suburbs
Posts: 684
Default

Cheap springs = Valve float, broken valves, trashed short block.

Don't skimp here or you will be shopping for a short block next time.
I would not think of spinning 7k+ with the stock L92 valves and cheap springs.
The LS3 hollow stem intakes would be ok with a quality beehive, but the stock L92 valves are heavy and require a quality spring to keep the valves under control.
Also, the lobe design of the cam will affect the max RPM quite a bit.
If you use a less agressive lobe design the valvetrain will be more stable at RPM, but you will leave some power on the table.
Budget builds and 7k+ redlines don't go together very well, at least not for long.
If you build it right the first time you will be better off in the long run.

The Patriot duals would be a very smart investment.
__________________
79 Camaro 6.0 twin s366's
best so far - 9.125@148.35mph - getting there.....
http://youtu.be/xlaD35oRQtU?list=UUF...p3ArhB91JKqcWQ
camarols1 is offline   Reply With Quote
Old 10-02-2008, 12:03 PM   #6
9 Second Club
 
camarols1's Avatar
 
Trader Rating: 17
Join Date: Oct 2006
Location: NW Chicago Suburbs
Posts: 684
Default

FYI ~

The hollow stem LS3 intake valves (GM#12569427) are only about $160 for all eight.
__________________
79 Camaro 6.0 twin s366's
best so far - 9.125@148.35mph - getting there.....
http://youtu.be/xlaD35oRQtU?list=UUF...p3ArhB91JKqcWQ
camarols1 is offline   Reply With Quote
Old 10-02-2008, 03:07 PM   #7
10 Second Club
 
jay_lt4's Avatar
 
Trader Rating: 4
Join Date: Oct 2006
Location: wisconsin
Posts: 856
Default

gm now has complete assembled cnc ported LS3/L92 heads for $600 each, i picked up a set for my new LS3 and they do look nice
__________________
415ci stroker, Magnacharger TVS2300, cnc heads, cam, yank ss3200 converter, Kooks long tubes, Bwoody true cold air kit, magnaflow 3" cat-back, lowering springs,BMR control arms and tie rod bars, 3.73 gears, diff mounts
jay_lt4 is offline   Reply With Quote
Old 10-03-2008, 09:43 AM   #8
TECH Enthusiast
 
tennerv8's Avatar
 
Trader Rating: 7
Join Date: May 2007
Location: Mn
Posts: 701
Default

Lets say I bought a set of bare L92's and wanted to go with the Ls3 valves you mentioned. What else would I need to buy to assemble these heads? Could I use the keepers from the stock Lq4 head that I will be removing?
tennerv8 is offline   Reply With Quote
Old 10-03-2008, 11:13 AM   #9
12 Second Club
 
whitew01ws6's Avatar
 
Trader Rating: 12
Join Date: Feb 2008
Location: westminster MD
Posts: 410
Send a message via AIM to whitew01ws6
Default

theres a guy on ebay that i have been seeing for a while now that always has these heads heres the linkhttp://cgi.ebay.com/ebaymotors/L92-L76-Assembled-heads-660-lift-Springs-LS2-LS7_W0QQitemZ230208594076QQihZ013QQcategoryZ33617Q QrdZ1QQssPageNameZWD1VQQcmdZViewItemQQ_trksidZp163 8Q2em118Q2el1247
__________________
01 ws6 A4, 342's, lid, 80mm BBK, spacer, stage 2 trans. 4000 vig. MS3. drag wheels and nitrouse coming soon. 12.30 on old set up new numbers coming sooooooonn
www.myspace.com/ta2000
whitew01ws6 is offline   Reply With Quote
Old 10-08-2008, 08:37 PM   #10
TECH Veteran
 
1CAMWNDR's Avatar
 
Trader Rating: 21
Join Date: Nov 2001
Location: NW Florida. Land of no 1/4 mile tracks.
Posts: 4,062
Default

Quote:
Originally Posted by jay_lt4 View Post
gm now has complete assembled cnc ported LS3/L92 heads for $600 each, i picked up a set for my new LS3 and they do look nice
I saw your pics in another thread, does anyone have unassembled pics of the ports/chambers? Are there any flow numbers?
__________________
Mike
1999 Formula LQ9 421, T56, 9"
2008 Suzuki Bandit 1250
2010 Silverado ECSB Z71, 5.3, 6L80
1CAMWNDR is offline   Reply With Quote
Old 10-09-2008, 09:49 AM   #11
10 Second Club
 
jay_lt4's Avatar
 
Trader Rating: 4
Join Date: Oct 2006
Location: wisconsin
Posts: 856
Default

here are the flow numbers for the gm cnc ported LS3/L92 heads:

4" bore:
.100" .200" .300" .400" .500" .600" .700"
I..68...150...217...259...295...329...324
E..55...105...136...162...182...195...202

4.030" bore:
.100" .200" .300" .400" .500" .600" .700"
I..69...152...217...259...296...328...325
E..51...102...134...164...185...197...205

4.155" bore:
.100" .200" .300" .400" .500" .600" .700"
I..69...154...222...266...309...345...358
E..46...100...136...166...189...202...209
__________________
415ci stroker, Magnacharger TVS2300, cnc heads, cam, yank ss3200 converter, Kooks long tubes, Bwoody true cold air kit, magnaflow 3" cat-back, lowering springs,BMR control arms and tie rod bars, 3.73 gears, diff mounts
jay_lt4 is offline   Reply With Quote
Old 10-11-2008, 08:04 PM   #12
TECH Regular
 
sixt9er's Avatar
 
Trader Rating: 1
Join Date: May 2008
Location: Oakland, CA
Posts: 425
Send a message via AIM to sixt9er
Default

Quote:
Originally Posted by tennerv8 View Post
I want to get a set of L92's for a future build. I want to run a larger lift cam (closer to 600 lift). Is it cheaper to buy the heads bare for $200 each and then buy the valves and related parts and higher lift valve springs? Or do I buy the complete L92's for $400 each and then just buy higher lift valve springs? This is a low buck build so if I could save a few bucks that would be sweet. Thanks fellas.
There is a little more involvement with these heads. I was a rookie with the L92 swap when I started. Mine were purchased bare for $175/each. I upgraded to Manley SS valves, had to purchase a set of L92 specific rocker arms, rocker arm stands, studs, a set of .650 max lift springs, retainers, locks, etc. It was beneficial to me to go the "bare" route and then build to suit my needs. It sucks because when I started this endeavor, no one was selling them in the configuration that I needed. Now you can mail-order a set of heads EXACTLY like what I had to piece together.
__________________
Post Disclaimer
1. I claim to be no expert.
2. My postings are simply my opinions and ideas, based on 19 years of experience building engines and other, various mechanical endeavors.
3. I respect the opinions and view points of other fellow LS1Tech users.
sixt9er is offline   Reply With Quote
Old 10-12-2008, 02:43 PM   #13
TECH Fanatic
 
salemetro's Avatar
 
Trader Rating: 5
Join Date: Sep 2008
Location: Clackamas/Salem
Posts: 1,092
Default

Just to echo what some have said here before....you get what you pay for. I just received my bare castings, and have Ferrea hollow-stem intakes and 6000 series exhaust valves on the way. It was a TOUGH decision, trying to balance cost against reliability. I initially thought that I'd be happy with 550hp N/A.....but for a semi-every-day driver, the car would not be as well mannered as I want....and it would be pushing the stock bottom end to it's limit. Sure, a "lopey" cam sounds cool...turns heads, etc....but how much FUN is it to drive on a long-distance trip?? I have since opted to turbo the engine. Once I got into it, the valves only cost right at 500.00 shipped. But of course, now I have to upgrade the rest of the bottom end. So, obviously, it depends on how fast you want to go....and how long you want it to last. I can tell you that I'm spending a $%&!load more now than I thought I initially would (oliver rods, Diamond pistons, Callies stroker crank)....but I know that it should live quite a while.

If you are truly doing this for a "future build"...then piece it together a little at a time with the best parts that you can find for the desired end-result of the build. Obviously, if you never plan to go FI or N2O, then that means the price of your build...and the quality of components required...goes down along with the target power output.

So, the old saying that "Speed costs. How fast do you want to spend??" definitely applies here.

Just my $.02
__________________
My Garage...
salemetro is offline   Reply With Quote
Old 10-15-2008, 12:18 AM   #14
TECH Enthusiast
 
tennerv8's Avatar
 
Trader Rating: 7
Join Date: May 2007
Location: Mn
Posts: 701
Default

Quote:
Originally Posted by salemetro View Post
Just to echo what some have said here before....you get what you pay for. I just received my bare castings, and have Ferrea hollow-stem intakes and 6000 series exhaust valves on the way. It was a TOUGH decision, trying to balance cost against reliability. I initially thought that I'd be happy with 550hp N/A.....but for a semi-every-day driver, the car would not be as well mannered as I want....and it would be pushing the stock bottom end to it's limit. Sure, a "lopey" cam sounds cool...turns heads, etc....but how much FUN is it to drive on a long-distance trip?? I have since opted to turbo the engine. Once I got into it, the valves only cost right at 500.00 shipped. But of course, now I have to upgrade the rest of the bottom end. So, obviously, it depends on how fast you want to go....and how long you want it to last. I can tell you that I'm spending a $%&!load more now than I thought I initially would (oliver rods, Diamond pistons, Callies stroker crank)....but I know that it should live quite a while.

If you are truly doing this for a "future build"...then piece it together a little at a time with the best parts that you can find for the desired end-result of the build. Obviously, if you never plan to go FI or N2O, then that means the price of your build...and the quality of components required...goes down along with the target power output.

So, the old saying that "Speed costs. How fast do you want to spend??" definitely applies here.

Just my $.02
Isnt there people on here running close to 1000rwhp with stock 6.0liter lower ends? I hear the cranks are strong at least.
tennerv8 is offline   Reply With Quote
Old 10-19-2008, 05:58 PM   #15
LS1TECH Sponsor
 
Jason 98 TA's Avatar
 
Trader Rating: 4
Join Date: Nov 2001
Location: Texas!
Posts: 4,160
Default

We're about to run a special on out of the box L92 heads with PRC spring kit & milling! Checkout the sponsor section late this week & we'll have it up! The L92 stock valve is considerably better than most the aftermarket valves in terms of p/v. That is something to consider for you guys looking to install without valve reliefs.

That being said you might also consider the PRC cnc ported 6.2l heads. For the money they're really hard to beat gained over 20rwhp over a out of the box 6.2l head!!
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason 98 TA is offline   Reply With Quote
Old 10-22-2008, 07:46 PM   #16
TECH Fanatic
 
Fb0dy0nly's Avatar
 
Trader Rating: 10
Join Date: Aug 2006
Location: Detroit ROCK City
Posts: 1,491
Default

Quote:
Originally Posted by tennerv8 View Post
Isnt there people on here running close to 1000rwhp with stock 6.0liter lower ends? I hear the cranks are strong at least.
yeah stock cranks are good for roughly 8-900rwhp+. Good to upgrade rods, pistons, etc. tho.
__________________
00' Silver Formula Ws6 M6 {1of233}
00' Silver Z28 M6 SOLD
95' White 3.8l Camaro
*UPDATED 8/7/13*Ls1/6 Parts For Sale Here
TurboSmart Fuel Pressure Regulator For Sale NIB. PM for details.
Fb0dy0nly is offline   Reply With Quote
Old 10-23-2008, 11:08 AM   #17
LS1TECH Sponsor
 
Jason 98 TA's Avatar
 
Trader Rating: 4
Join Date: Nov 2001
Location: Texas!
Posts: 4,160
Default

I've personally made well over 900hp with a stock crank!!
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason 98 TA is offline   Reply With Quote
Old 10-28-2008, 07:47 PM   #18
Teching In
 
Trader Rating: 2
Join Date: Aug 2007
Location: DFW
Posts: 44
Default

Are the L92 heads ready to assemble when you get them bare from GM?
Bcar is offline   Reply With Quote
Old 10-28-2008, 07:47 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
general lift and different rockers questions... enter cam and valve spring gods! EscaTruck Generation IV Internal Engine 3 06-24-2013 07:26 PM
New build help! Chi_weezy Generation IV External Engine 3 05-13-2013 09:48 PM
Higher lift beehive spring recomendation for L92's tennerv8 Generation IV Internal Engine 10 10-08-2008 01:14 PM
Bare Vs Assembled L92 Head Purchase: Which one? WizeAss Generation IV Internal Engine 29 01-01-2007 10:10 PM


Tags
12569427, 650, assembled, bare, buy, camshaft, gm, heads, l92, l92s, lift, lopey, max, price, springs, valve


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



Join Ls1Tech

All times are GMT -5. The time now is 04:55 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details