jr6784

not sure if this is where i post a thread, pretty much from what i seen is a lq4 l92 with ls3 intake as a engine setup, are the heads stock or do they need to have different components upgraded valvetrain wise? And is the motor stock on this setup people are using? Or should new rings and bearings be replaced when going this route? Also cant seem to see what to look for as far as when chosing a cam wondering whats the most common one... i have no goals hp wise just want a good daily driver with some get up behind it will be going into a 4400lb car
thanks for any info or links that you post here I appreciate the help and advise

xdanny510x

No.. they just change the heads.. and use ls3/l92 valve train which is offset.. no need to mess with rotating assembly unless ur doing a forged stroker set up.. just find a suitable cam and ur set to go

ragtopz28

iTrader: (57)

That combo will be way down on compression. Either mill the heads or install some flat top pistons (LS2 or LQ9).

handyandy496

iTrader: (9)

The chambers will flo better in an uncut head..... Not to mention the loss of rigidity and even a little cooling. I built my setup around the cnc ported gmpp ls3 head and it loves to rev even with a 4.1 stroke.

A.R. Shale Targa

iTrader: (2)

I'd have the heads cut .008"-.010" and run a .040" Cometic head gasket
You're trying to get the low 9.4:1 compression ratio up to around 9.75-9.8 or so
You also made no mention of trans/stall gear ratio or plans for the vehicle
4400 pounds is a ******* **** ton though
So keep the cam small. Cam Motion has a 212/216 that would be very driver
Friendly

kinglt-1

iTrader: (26)

jr6784

whats the better of the two? Im assuming getting lq9 flat top pistons and rods since The engine has 138k miles on it or even with that mileage messing with the bottom end is not necessary? And milling should be fine as is?

jr6784

trans will end up being a 4l60e one that will be built to handle more power and weight than stock dont want to put any other one due to not wanting to modify the trans tunnel if i went bigger ... stall converter not sure what kind yet trying to figure out the engine side of it cause i have no idea what type of numbers to expect from this kind of setup from the 6.0 L92 combo....

jr6784

ok so just by buying the L92 heads and leaving them stock is fine and putting them on i should have no issues, sweet .... do you happen to know if headers that are used on the 317 casting heads( lq4 6.0) fit the L92 heads?

xdanny510x

headers will work..

ragtopz28

iTrader: (57)

I have a stock LQ4/L92 and before I installed the heads I called Brian Tooley, he said I would be disappointed with the L92 heads on the dished pistons unless I milled them. I sent to him (to check out the ported-by-other heads and install his springs) and he took them down about .025

handyandy496

iTrader: (9)

That block can be bored out too for more cubes and more valve relief/better flow. With new pistons u can pick your compression. I'm running close to 12 to 1 on 93 pump gas. The cam was specked for it.

KCS

iTrader: (20)

With the intake valve offset, the intake rockers different. If you don't have them already, the intake rockers and stands will be needed. The exhaust rockers are the same as the other LS engines (except LS7) though.

jr6784

No dont have them, gathering the info before i go this route, what intake rockers and valves would i need for this? Thanks for this insight

jr6784

Thanks but i would like to avoid boring the motor with pistons, not wanting to go that route just yet i still need to swap this thing into the vehicle from what im reading and gathered so far is milling the heads and changing the intake valves and rockers is the route to go

KCS

iTrader: (20)

Stock rockers would probably be fine, unless you try to run a lot of lift. Stock valves are fine. Both intake and exhaust valves are bigger in the L92/LS3 heads, but if you can snag the LS3 intake valves, they're hollow so they weigh less.

handyandy496

iTrader: (9)

With the stock dish pistons you will have to mill the head quite a bit to get decent compression. U just need the 8 intake offset rockers and stands. Go with a .045 to .050 gasket. Aluminum blocks can go a bit tighter because they expand more increasing the deck height.

CAMMOTION PERF

You can make that combo work no problem. An LQ4 with LS3 or L92 heads will have 9.7:1 compression with a standard .051" thick head gasket. You can mill them to increase the compression further. Now, as some have said, milling the heads will decrease piston-to-valve clearance, but in a 4400 pound daily driver, you are probably not going to want a wild camshaft anyway.

If you mill the heads .020", you can get the compression up to 10:1. With a mild camshaft like our Cam Motion Titan 1 LS3 or Titan 2 LS3 cams, you will still have plenty of piston-to-valve clearance.

Which camshaft you chose will depend on your transmission, gearing, torque converter and desired performance characteristics. But, a 10:1 LS 3 headed LQ4 with a Titan 1 LS3 or Titan 2 LS3 camshaft will be a very spirited and fun powerplant for sure.