370 LQ4 with LS3 top end
10-25-2011, 06:35 AM
#1
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370 LQ4 with LS3 top end Hey guys, I was curious if you could throw out guesses at what kind of power im going to make when I get this engine together. Heres the set up:
2004 LQ4 6.0 Block
Bore .030 over
Mahle 4.030 L92 forged pistons
Eagle Esp 6.125 rods
Stock crank
LS3 heads Ported by ????
LG Motorsports G6X3 Camshaft
1 7/8 Stainless Works Long tubes
100-150 wet shot
T56
Moser 9" 4.30 gear.
Thanks in Advance.
2004 LQ4 6.0 Block
Bore .030 over
Mahle 4.030 L92 forged pistons
Eagle Esp 6.125 rods
Stock crank
LS3 heads Ported by ????
LG Motorsports G6X3 Camshaft
1 7/8 Stainless Works Long tubes
100-150 wet shot
T56
Moser 9" 4.30 gear.
Thanks in Advance.
Last edited by 1badeagle; 11-08-2011 at 11:13 PM.
11-05-2011, 09:13 AM
#7
Those heads are way too large (In. runner volume) to make average torque
throughout the powerband. N.A. accelaration will be less than ideal but I'll
guess 465 rwhp......thing is it will LOVE the juice and should easily eclipse the
600rwhp mark on a 150 shot. Depending on the weight of the car...should
run deep tens.
throughout the powerband. N.A. accelaration will be less than ideal but I'll
guess 465 rwhp......thing is it will LOVE the juice and should easily eclipse the
600rwhp mark on a 150 shot. Depending on the weight of the car...should
run deep tens.
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11-07-2011, 11:53 PM
#8
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Car should be right at 3000 without the driver I hope. I was hoping to hear a higher NA hp number. Will it make more power without porting the heads?
Also, Anyone ever port there victor jr?
Also, Anyone ever port there victor jr?
11-08-2011, 08:55 PM
#9
It is often better to sacrifice some top-end horsepower for a substantial
boost in midrange torque. Many people on these forums have gone from L-92s
to a 225 AFR or 235 TrickFlow head and have gone faster in the quarter. This
is especially true on 364 inchers and even 383 as well as 402/408 combos.
boost in midrange torque. Many people on these forums have gone from L-92s
to a 225 AFR or 235 TrickFlow head and have gone faster in the quarter. This
is especially true on 364 inchers and even 383 as well as 402/408 combos.
11-08-2011, 09:21 PM
#10
im building this identicle engine!! just picked up the ls3 heads new for $600 on ebay.. i would say youl be more to the 500 mark and these heads are not to big for the engine if it was then why did GM put l92 heads on a 6.0l? and the ls3 is a 6.2l thats only 6ci bigger then the 370 ur building? hmmmmm..i think u got a stout combo!
11-08-2011, 09:53 PM
#11
im building this identicle engine!! just picked up the ls3 heads new for $600 on ebay.. i would say youl be more to the 500 mark and these heads are not to big for the engine if it was then why did GM put l92 heads on a 6.0l? and the ls3 is a 6.2l thats only 6ci bigger then the 370 ur building? hmmmmm..i think u got a stout combo!
Second GM NEVER put L92 heads on a 6.0......6.2 is 4.065" bore
Third...they work on a 376" because of fly-by-wire torque management
which modulates the throttle body to enhance airspeed by restriction
Lastly he may engine dyno 500 but definitely not to the ground.
Even the Car Craft guys admitted this fact.
11-08-2011, 10:03 PM
#12
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First his 4.020 bore equals 368 not 370
Second GM NEVER put L92 heads on a 6.0......6.2 is 4.065" bore
Third...they work on a 376" because of fly-by-wire torque management
which modulates the throttle body to enhance airspeed by restriction
Lastly he may engine dyno 500 but definitely not to the ground.
Even the Car Craft guys admitted this fact.
Second GM NEVER put L92 heads on a 6.0......6.2 is 4.065" bore
Third...they work on a 376" because of fly-by-wire torque management
which modulates the throttle body to enhance airspeed by restriction
Lastly he may engine dyno 500 but definitely not to the ground.
Even the Car Craft guys admitted this fact.
11-08-2011, 10:58 PM
#16
If you are set on running an LS3 style cylinder head then I would recommend considering our PRC 250cc LS3 aftermarket casting cylinder head. Its going to make great power under the curve as well as up top in the rpm range. Here is a link to them on our website.
http://www.texas-speed.com/p-3200-pr...der-heads.aspx
http://www.texas-speed.com/p-3200-pr...der-heads.aspx
11-09-2011, 12:01 AM
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If it is the case that the 243's are better, then why are there so many guys with 6 liters switch to the ls3 heads and they are making close to or over 500 wheel?
