LQ4 build needs your advice...
LQ4 build needs your advice... I wanted to get some input from people on this site about a combo I'm thinking of putting together. It's a semi budget build because I'm not replacing anything in the bottom end apart from the rod bolts. I was originally going to do a turbo build with the low compression LQ4 block but other things have came up and I'm no longer able to follow this route. My goals for this combo are a reliable 450+ rwhp and mid-low 11's, let me know where you see anything that can be improved upon or changed and if my goals are realistic.
Basics:
'99 Z28
Pacesetter 1 3/4 longtube headers
Hooker Cat-back
Performabuilt 4L60E Tranny
3500 Stall
Stock 10 bolt
Engine Build:
Low mileage '04 LQ4
CNC'd L92 Cylinder heads milled to 65cc chambers (hoping to pump up the compression closer to 10:1)
LS7 Lifters
All ARP hardware Head/Rod/Crank bolt etc.
GM MLS head gaskets
ls6 oil pump
GMPP Carb style intake or Car Intake (still undecided on this)
Custom ground cam
Trying to keep the build somewhere around $4k. If you've got ideas on a cam profile to use let me know. I've already sold most of the turbo stuff I had and want to get started on this soon, spring is here and my car is still sitting in the garage not running
Basics:
'99 Z28
Pacesetter 1 3/4 longtube headers
Hooker Cat-back
Performabuilt 4L60E Tranny
3500 Stall
Stock 10 bolt
Engine Build:
Low mileage '04 LQ4
CNC'd L92 Cylinder heads milled to 65cc chambers (hoping to pump up the compression closer to 10:1)
LS7 Lifters
All ARP hardware Head/Rod/Crank bolt etc.
GM MLS head gaskets
ls6 oil pump
GMPP Carb style intake or Car Intake (still undecided on this)
Custom ground cam
Trying to keep the build somewhere around $4k. If you've got ideas on a cam profile to use let me know. I've already sold most of the turbo stuff I had and want to get started on this soon, spring is here and my car is still sitting in the garage not running
I wanted to get some input from people on this site about a combo I'm thinking of putting together. It's a semi budget build because I'm not replacing anything in the bottom end apart from the rod bolts. I was originally going to do a turbo build with the low compression LQ4 block but other things have came up and I'm no longer able to follow this route. My goals for this combo are a reliable 450+ rwhp and mid-low 11's, let me know where you see anything that can be improved upon or changed and if my goals are realistic.
Basics:
'99 Z28
Pacesetter 1 3/4 longtube headers
Hooker Cat-back
Performabuilt 4L60E Tranny
3500 Stall
Stock 10 bolt
Engine Build:
Low mileage '04 LQ4
CNC'd L92 Cylinder heads milled to 65cc chambers (hoping to pump up the compression closer to 10:1)
LS7 Lifters
All ARP hardware Head/Rod/Crank bolt etc.
GM MLS head gaskets
ls6 oil pump
GMPP Carb style intake or Car Intake (still undecided on this)
Custom ground cam
Trying to keep the build somewhere around $4k. If you've got ideas on a cam profile to use let me know. I've already sold most of the turbo stuff I had and want to get started on this soon, spring is here and my car is still sitting in the garage not running
Basics:
'99 Z28
Pacesetter 1 3/4 longtube headers
Hooker Cat-back
Performabuilt 4L60E Tranny
3500 Stall
Stock 10 bolt
Engine Build:
Low mileage '04 LQ4
CNC'd L92 Cylinder heads milled to 65cc chambers (hoping to pump up the compression closer to 10:1)
LS7 Lifters
All ARP hardware Head/Rod/Crank bolt etc.
GM MLS head gaskets
ls6 oil pump
GMPP Carb style intake or Car Intake (still undecided on this)
Custom ground cam
Trying to keep the build somewhere around $4k. If you've got ideas on a cam profile to use let me know. I've already sold most of the turbo stuff I had and want to get started on this soon, spring is here and my car is still sitting in the garage not running
look at my build
What head gasket did you use Soul?
I'm using 5.3 heads and a .40 gasket for 10.9:1 on mine, also using a slightly larger cam too. I'm shooting for 450hp to the wheels, but it will be carbed so it should make things a lil easier.
224/236 .612/.609 117+2
For the OP- the cam specs will differ depending on the intake used. The lift on the L92 heads will also be lower for clearance reasons because of the large valves.
I'm using 5.3 heads and a .40 gasket for 10.9:1 on mine, also using a slightly larger cam too. I'm shooting for 450hp to the wheels, but it will be carbed so it should make things a lil easier.
224/236 .612/.609 117+2For the OP- the cam specs will differ depending on the intake used. The lift on the L92 heads will also be lower for clearance reasons because of the large valves.
Last edited by djsanchez2; Mar 28, 2009 at 08:29 PM.
make sure you prepare for the passenger side valve cover. your stock one will not clear without grinding the baffles because of the offset rockers. if you go car intake make sure you get the right extensions and plugs. the l76 you need to extend the map, ls3 you need an ls3 map and you need to extend/wire the new pigtail.
Trending Topics
Hell no they don't but they can be ported to flow ~300cfm if valve size is increased. Just don't see the point of using heads that huge on a stock bottomend if they come with compromises and restrictions.
Can mill them too much, Can go big boy cam, hard to get good compression numbers (11+) for a solid combo, thus can't really tap into the huge flow numbers anyways.
Can mill them too much, Can go big boy cam, hard to get good compression numbers (11+) for a solid combo, thus can't really tap into the huge flow numbers anyways.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo Hell no they don't but they can be ported to flow ~300cfm if valve size is increased. Just don't see the point of using heads that huge on a stock bottomend if they come with compromises and restrictions.
Can mill them too much, Can go big boy cam, hard to get good compression numbers (11+) for a solid combo, thus can't really tap into the huge flow numbers anyways.
Can mill them too much, Can go big boy cam, hard to get good compression numbers (11+) for a solid combo, thus can't really tap into the huge flow numbers anyways.
Hmmm cuz i was on the fence between the two and had a cam spec'd for both set-up and got these two stealth cams
Carbed LQ4, TH400, 9", 2800lb Nova wagon
P&P 5.3 heads w/ ls1 intake valves: 224/236 .612"/.609" 117+2
out of the box L92's: 218/230 .595”/.600” 116+3
Carbed LQ4, TH400, 9", 2800lb Nova wagon
P&P 5.3 heads w/ ls1 intake valves: 224/236 .612"/.609" 117+2
out of the box L92's: 218/230 .595”/.600” 116+3
Just the regular 6.0 LS2 Head Gasket... don't remember the actual specs on thickness...
Really? I didn't have to change mine... the dished pistons that come in the LQ4 should give him enough clearance... course he didn't mention his cam specs, and i'm not that knowledgeable about the heads he's using so I don't know if that would make a difference compared to my setup...
Really? I didn't have to change mine... the dished pistons that come in the LQ4 should give him enough clearance... course he didn't mention his cam specs, and i'm not that knowledgeable about the heads he's using so I don't know if that would make a difference compared to my setup...
Just the regular 6.0 LS2 Head Gasket... don't remember the actual specs on thickness...
Really? I didn't have to change mine... the dished pistons that come in the LQ4 should give him enough clearance... course he didn't mention his cam specs, and i'm not that knowledgeable about the heads he's using so I don't know if that would make a difference compared to my setup...
Really? I didn't have to change mine... the dished pistons that come in the LQ4 should give him enough clearance... course he didn't mention his cam specs, and i'm not that knowledgeable about the heads he's using so I don't know if that would make a difference compared to my setup...
^^^ 
FYI the stock gasket is .051" thick and the dish on the piston is -6cc
And going off ur specs you should have a 10.8:1 compression Soul, not 11:1
FYI the stock gasket is .051" thick and the dish on the piston is -6cc
And going off ur specs you should have a 10.8:1 compression Soul, not 11:1
Last edited by djsanchez2; Mar 29, 2009 at 12:35 AM.
just being honest...
with a 59cc chamber, 4" bore, .051" gasket w/ 4.065" bore, -6cc dish, plus with the pistons on his motor being .008" out of the hole i got his compression at 11.05:1
I got everything else right though, dish cc, piston outta the whole, etc. Not questioning ur math, i'm just looking to make the same compression on my motor. 
Oh i see, looks like the L92 gasket has a 4.065 bore. Did that replace the ls2 gasket?
Oh i see, looks like the L92 gasket has a 4.065 bore. Did that replace the ls2 gasket?
Last edited by djsanchez2; Mar 29, 2009 at 02:08 PM.
make sure you prepare for the passenger side valve cover. your stock one will not clear without grinding the baffles because of the offset rockers. if you go car intake make sure you get the right extensions and plugs. the l76 you need to extend the map, ls3 you need an ls3 map and you need to extend/wire the new pigtail.
I want to use the stock bottom end right now without having to flycut or pull out the pistons.Just the regular 6.0 LS2 Head Gasket... don't remember the actual specs on thickness...
Really? I didn't have to change mine... the dished pistons that come in the LQ4 should give him enough clearance... course he didn't mention his cam specs, and i'm not that knowledgeable about the heads he's using so I don't know if that would make a difference compared to my setup...
Really? I didn't have to change mine... the dished pistons that come in the LQ4 should give him enough clearance... course he didn't mention his cam specs, and i'm not that knowledgeable about the heads he's using so I don't know if that would make a difference compared to my setup...
I figured out what i was doing wrong on the calculator, i was putting the deck height as a positive number instead of a negative number DUH!! It comes out at 11.05:1 every time now.