build the lq4??

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06-22-2009, 01:36 PM
banker099

build the lq4??

after reading these articles.

Testing The New GM L92 Cylinder Heads - Car Craft Magazine

LS2 Engine L92 Cylinder Heads - GM High Tech Performance

i am now contemplating the idea of getting some worked l92 heads and decking the down to 64cc chambers and putting as nice cam in and calling it good for now

what is you guys opinions on this idea?
what is your guys for Rwhp?

going down to 64cc will make the lq4 the same compression as a stock lq9 correct?

anybody know what the factory head gasket thickness is?

ok thats all the questions i have for now :)
06-22-2009, 01:53 PM
Show&Go

According to the last section of that top article the lq4 aluminum head has almost the same CC. If you take the CC down some you will up the CR. So Between that and a cam I think you would be very happy compared to where you are at right now! Go for it!
06-22-2009, 02:01 PM
mean05

factory head gaskets i believe are right at .55
06-22-2009, 02:19 PM
banker099

so i guess i can always go with a thinner head gasket as well....assuming they make different thicknesses for the l92's
06-22-2009, 02:44 PM
Show&Go

Get a good intake manifold as well! My as well. Can pick a good edelbrock pro flow for around 500 I think is whats advertised. Should be good for hp and tq!
That would be a interesting motor build.... imo
06-22-2009, 02:51 PM
PurpleMinivan

They don't make a Pro Flo intake for L92 heads yet and 64cc's is cutting it close before piston to valve contact. If you plan on going boost later, deck them to 68-70cc's at the least.
06-22-2009, 02:52 PM
Show&Go

Quote:

Originally Posted by DBTBSS

They don't make a Pro Flo intake for L92 heads yet and 64cc's is cutting it close before piston to valve contact. If you plan on going boost later, deck them to 68-70cc's at the least.

That sucks they dont have them for it yet! Isnt it supposed to be more designed for torque then the Fast90s? Thought it would be interesting.
06-22-2009, 02:53 PM
banker099

those edelbrock intake are MIA from what i hear, ive still yet to see one on someones engine,

what are the rpm limits on the factory L92 truck intake?
06-22-2009, 02:54 PM
banker099

Quote:

Originally Posted by DBTBSS

They don't make a Pro Flo intake for L92 heads yet and 64cc's is cutting it close before piston to valve contact. If you plan on going boost later, deck them to 68-70cc's at the least.

im not the type for boost...if anything it will be :nx:
06-22-2009, 03:02 PM
PurpleMinivan

The stock L92 intake was enough for my LS3 418 up to 6700rpms. Single cab truck 9.5-1--10-1 CR, 230's-.600 112-114 cam, 3600 stall with a healthy shot would be interesting...
06-22-2009, 03:05 PM
banker099

Quote:

Originally Posted by DBTBSS

The stock L92 intake was enough for my LS3 418 up to 6700rpms. Single cab truck 9.5-1--10-1 CR, 230's-.600 112-114 cam, 3600 stall with a healthy shot would be interesting...

thats pretty much the plan...at least 10:1 though, high compression and good heads is the key to power :naughty:
06-22-2009, 06:05 PM
PurpleMinivan

Quote:

Originally Posted by banker099

thats pretty much the plan...at least 10:1 though, high compression and good heads is the key to power :naughty:

Or you could just put some decked 243/799 heads on there to really bump the CR up... 10.5 to 1
06-22-2009, 07:19 PM
banker099

Quote:

Originally Posted by DBTBSS

Or you could just put some decked 243/799 heads on there to really bump the CR up... 10.5 to 1

or some decked l92s
06-22-2009, 09:23 PM
banker099

did some work tonight, this motor is filthy
http://i65.photobucket.com/albums/h2...ownload2-1.jpg

its definitely an Lq4
http://i65.photobucket.com/albums/h2...download-2.jpg

some of the parts i did manage to get clean, minus the rocker arms...lol
http://i65.photobucket.com/albums/h2...edownload3.jpg
06-22-2009, 09:27 PM
sprayedenali

looks good Ryan! should be a cool build!
06-22-2009, 10:19 PM
skeet

Quote:

Originally Posted by banker099

those edelbrock intake are MIA from what i hear, ive still yet to see one on someones engine,

what are the rpm limits on the factory L92 truck intake?

i figure around 6800 probably max, i shift at 6700 - 6800

Quote:

Originally Posted by banker099

so i guess i can always go with a thinner head gasket as well....assuming they make different thicknesses for the l92's

they make different thicknesses just use a 6.0 head gasket!! if ya gonna stay NA shoot for a 11:1 cr, i am fine with it and i drive my truck daily. whatever you do, talk to some cam guru's and have them spect a cam for you. only difference is i am running a lq9 i had my heads milled .015 then used a .040 mill gasket.

DBTBSS is very familiar with these heads as to another member on another site, that i followed when i built my motor, i just did a few things different ;)
06-23-2009, 12:18 AM
banker099

Quote:

Originally Posted by skeet

i figure around 6800 probably max, i shift at 6700 - 6800

they make different thicknesses just use a 6.0 head gasket!! if ya gonna stay NA shoot for a 11:1 cr, i am fine with it and i drive my truck daily. whatever you do, talk to some cam guru's and have them spect a cam for you. only difference is i am running a lq9 i had my heads milled .015 then used a .040 mill gasket.

DBTBSS is very familiar with these heads as to another member on another site, that i followed when i built my motor, i just did a few things different ;)

cool yeah i will most likely be running the stock l92 truck intake then,

i didnt know if i had to use the l92 head gaskets or if the 317 head gaskets would work, but now i guess they are the same so i can go with the thinner ones for an extra bump in cr,

i would love 11:1 but its gonna be hard to get that with an lQ4
06-23-2009, 03:43 PM
hirdlej

I am dealing with the same dilemma. I wanted to go with the L92 setup BUT there's just no way I can get the comp up high enough (no less than 10.5:1) with the lq4 shortblock without worrying about to PTV issues. I think you're better off going with a ported set of cathederal heads (really nice ones though, no TSP junk, etc) It'll cost more but you won't have to flycut pistons or worry about over revving.
06-23-2009, 03:54 PM
Frenchy

Why not just LQ9 pistons?
06-23-2009, 04:22 PM
PurpleMinivan

Quote:

Originally Posted by hirdlej

I think you're better off going with a ported set of cathederal heads (really nice ones though, no TSP junk, etc)

+1... Well said! Another victim maybe? lol
06-23-2009, 09:37 PM
hirdlej

Not a victim, I just know better :P
06-23-2009, 11:21 PM
banker099

i am still undecided as of now, ill post up what the plans r once i actually have them, i love all the info and know how on this site tho!!

and you guys opinions are definitely not overlooked....still doing research as of now and sending pms back and for with richard at wcch

ill let u know what i come up with