LQ4 408 Tuning?
Thread Starter
Launching!
Joined: Aug 2008
Posts: 253
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LQ4 408 Tuning? So heres the scoop. I built an LQ4 408 and its running very rich as you can see in the picture I attached. I'm wondering if anyone knows which size jets I should run? I'm not sure what jets are currently in the carb as I bought it used and just slapped it on the car. Not sure if my small air cleaner is causing the super rich condition its a 10" air cleaner. I'm only running a 10" cleaner, because thats all that fits in my shaker scoop. I'm at sea level the combo ran an 11.48 @116.64 second pass. I'm happy with the E/T just thought it would trap more MPH. Heres the specs...
2003 Lq4 408 stroker
10.8:1 SCR
8.5:1 DCR
.037" quench
Stock untouched LS3 heads 821 castings
Forged -8cc wiesco pistons
Forged callies compstar crank
Forged eagles 6.125" rods
ARP 2000 rod bolts
Clevite bearings
231/242 @.050" .617/.615" 110LSA cam
Lunati Gold Dual Valve Springs (.660 lift)
Untouched L92 Victor JR. intake manifold
Quick Fuel 750 cfm double pumper mechanical secondaries (Q750)
LS7 Lifters
7.400 hardened pushrods
1 7/8" Dynatech Long Tube headers
NGK TR55 plugs gapped at .050"
3" X pipe into 2.5" Sweet Thunder mufflers
3000 stall converter
TH400 Transmission
3.73 rear gear with 275/60/15 when racing
Shifting at 6800rpm, redline 7000rpm
Launching at 2600rpm foot brake.
34* degrees of timing.
Engine is in a 1970 firebird weighing probably 3300 pounds.
Heres the link of the 11.48 pass.
2003 Lq4 408 stroker
10.8:1 SCR
8.5:1 DCR
.037" quench
Stock untouched LS3 heads 821 castings
Forged -8cc wiesco pistons
Forged callies compstar crank
Forged eagles 6.125" rods
ARP 2000 rod bolts
Clevite bearings
231/242 @.050" .617/.615" 110LSA cam
Lunati Gold Dual Valve Springs (.660 lift)
Untouched L92 Victor JR. intake manifold
Quick Fuel 750 cfm double pumper mechanical secondaries (Q750)
LS7 Lifters
7.400 hardened pushrods
1 7/8" Dynatech Long Tube headers
NGK TR55 plugs gapped at .050"
3" X pipe into 2.5" Sweet Thunder mufflers
3000 stall converter
TH400 Transmission
3.73 rear gear with 275/60/15 when racing
Shifting at 6800rpm, redline 7000rpm
Launching at 2600rpm foot brake.
34* degrees of timing.
Engine is in a 1970 firebird weighing probably 3300 pounds.
Heres the link of the 11.48 pass.
Last edited by Fast 95 Z28; Jan 30, 2014 at 11:29 AM.
Thread Starter
Launching!
Joined: Aug 2008
Posts: 253
Likes: 0
