New 408 what will it dyno/run in the 1/4!
04-16-2012, 01:03 PM
#1
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New 408 what will it dyno/run in the 1/4! Hi, just wrapping up my 408 build just want some ideas what it will dyno around, just want a ballpark guess. I care more about running high 10's/ low 11's 
Motor specs follow:
2003 LQ4 408 Stroker
Wiseco -8cc dish pistons
Forged eagle 6.125" rods with ARP 2000 Rod bolts
Callies Compstar 4" Stroke crankshaft.
.045" gaskets for .037" quench
Custom Pat G cam (23x/24x) .617/.615" 110LSA+4 advance
LS7 Lifters
Comp Cam 7.400 chromoly pushrods
Lunati Dual Gold Springs .660" lift
Melling Stock Replacement Oil Pump
Stock LS3 heads (821 castings with LS3 hollow intake valves)
Victor jr intake (might port match it to heads)
Holley 750 double pumper
Static compression ratio: 10.72:1
Dynamic compression ratio: 8.49:1
Running 91 octane at sea level.
Th400 with 3500 stall, 12 bolt 3.73 rear gear, 28" rear tire.
Hooker Long Tubes 1 3/4" Primary 3" collectors
Revving the motor to 6800-6900, Redline 7000rpm
The motor is going in a 1970 Trans AM weighing about 3400-3500 RACE WEIGHT
Hoping for 480-500rwhp and high 10s!
Motor specs follow:
2003 LQ4 408 Stroker
Wiseco -8cc dish pistons
Forged eagle 6.125" rods with ARP 2000 Rod bolts
Callies Compstar 4" Stroke crankshaft.
.045" gaskets for .037" quench
Custom Pat G cam (23x/24x) .617/.615" 110LSA+4 advance
LS7 Lifters
Comp Cam 7.400 chromoly pushrods
Lunati Dual Gold Springs .660" lift
Melling Stock Replacement Oil Pump
Stock LS3 heads (821 castings with LS3 hollow intake valves)
Victor jr intake (might port match it to heads)
Holley 750 double pumper
Static compression ratio: 10.72:1
Dynamic compression ratio: 8.49:1
Running 91 octane at sea level.
Th400 with 3500 stall, 12 bolt 3.73 rear gear, 28" rear tire.
Hooker Long Tubes 1 3/4" Primary 3" collectors
Revving the motor to 6800-6900, Redline 7000rpm
The motor is going in a 1970 Trans AM weighing about 3400-3500 RACE WEIGHT
Hoping for 480-500rwhp and high 10s!
Last edited by Fast 95 Z28; 04-16-2012 at 08:03 PM.
04-17-2012, 12:10 PM
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i think your number will be lower then you are aiming for due to your drivetrain, but I would say you might need a little more gear in the rear to see 10's. My guess would be 11.5's
04-17-2012, 01:01 PM
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you think it will still run mid 11's even with drag radials? and im guessing 500rwhp is more realistic through an M6?
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04-21-2012, 08:03 PM
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500 most likely with an m6, but i'm seeing a th400 in the list of parts you're going to use? every dyno thread i've read that has a th400 dyno's real low, so it was just a guess. and my uncle has a similar setup in his 72 camaro, but has 4.10's. I can still run him on my bike which i've run a best of 10.92 on... So i figured you'd be 11.0-11.5. I could be completely wrong though
