a ported factory head with 400 + cubes is capable of 500 rwtq but a small runner,high velocity head will be the ticket. something like a 408 or 418 with some tfs 235's with 11:5 - 12:0 scr, a cam in the 24x/25x range on a tight lsa with a few degrees of advance ground in to get your dcr around upper 8.x range and all the goodies to match should get you 550 rwhp/500 rwtq or so.

 

X2
A L92 block and a 4-4.125 stroke will probably be the most cost friendly. I ended up with 535 with my 427 4" stroke TFS 245's 249/255 cam, fast 102. If I had it to do over again using a manual trans I probably would have went with some good LS7 style heads and a smaller cam and been more street friendly with similar track times. Dont confuse good low end torque under a load with good drivability. Are you running a stick or auto? What stall? A high stall will take care of a lot of drivability issues and also make the need for low end torque much less important.

 

id check above and look through the 408 results part II sticky mines in post #2 in that thread.

So like the rest said CI are great. The more CI you have for a certain power lever the better it will drive (assuming NA)

like SLOW TRAP said 400+ci and HIGH VELOCITY heads!!!!!!!!!! I have 205 AFRs on my 402 but it gives instant throttle response and tip in it drives great and is ready to light up the tires and slam you in the seat and any RPM idle up!!!!

 

hate to say I didnt spend 10k on my top end and got to 496 with a 408 with 243 heads and a g5xx cam.

 

Most of lpe's top end $$$ is that intake setup, but looks badass..... U can Def do a strong running 4xx ci for under 10k intake to oil pan.... I bought my Afr heads used on here they're obsolete but still giving me good numbers ... Easiest way to get good/max power and torque is 4xx ci and a tfs head with supporting mods.

 

LOL, More money than i have...

406/396 on motor

488/556 On small shot (working on putting it on a medium shot 200)

On a Mustang Dyno

232/238 .599/.601 - 113 Voodoo Cam
Factory Valve train
.650 dual valve springs
Fast 90
Holley 90 tb
SLP Mas
Lid
Pacesetter stainless headers
Y-pipe
Magna-flow CB
stock 6.0l heads with ls1 valves ( not sure if the 6.0 are diff.)
6.0l block
Rebuilt 6-speed
Mc Leod Everything (M,Slave, Clutch and Flywheel)
12 Bolt moser 33 spline 3.73 gear
MT Radials

BTW, I have been on the Powertour 1400+ miles, Ga 1/2 mile shootout, Cruise-ins, street racing, etc. All with factory everything, PS,PB, A/C, cruise, tilt, Etc, you get the picture. I have only removed two parts, one was the Smog pump, and the other was the Spare and Jack.

 

Im hoping for the 500+ tq also. started with 821.s for the big valves and flow $600. Found a ls2 block $750. Going .030 over. I found a 4.1 crank here $600. 11.7 Arias flat top's new on ebay for $500 with rings. New H beam rods.$325. ls3 intake complete here $375. Got hold of Martin at tick and he designed my cam to accommodate a huge duration on the exhaust valve 250@.050. That to me says gobs of torque. It should run on 93 oct pump gas too.

Get your cam from tick!!!

Ill be up at the Georgia mile with it too.

 

Georgia mile? Where and when is this?

 

Got TEA 243's and a fairly small cam 236/242-601/610 @113. Made 517/510.

 

it can be done many ways .consider a ls 383 with afr 210 heads ,and a fast 102 intake .get the cam from Tony Mamo .or a ls2 or 6.0 ,stroked and bored to 402+ ci ,with stock ls3 heads ,and fast intake with a custom cam .

 

my combo 502hp/504tq at the wheels on a truck through a stalled auto and 4.10 rear gears. 450 ft/lbs and up from 3400 to 5600 rpm peak at 4800

406 ci (lq9 bored .020) 11.4:1 static comp
TFS 225 heads
EPS 234/242 113+2
Stock trailblazer SS intake and throttle body (87mm)
1 3/4 headers

race weight 5100 lbs. 11.40 @ 118 mph

 

Here is a project we did for a 100% stock driver

427ci at 12-1 comp
LS7 heads, stock porting, just valves
FAST 102 intake/tb
218/230 on 115 Cam
lightweight flywheel/clutch. 12lbs lighter than stock,so still drivable
numbers- 535hp/530tq peak HP at 5800rpm

Idled at 750rpm/ 40kpa. Drives 100% like stock. No bucking even in 1st at 1200rpm cruising.

Was a torque monster across the curve.

 

1999 Pontiac Firebird Trans Am WS6 M6

ENGINE MODIFICATIONS:
Texas Speed & Performance LQ9 Gen III Iron Block 408 CID Stroker 6.6 Liter
Installed 9/14/2013 @ 27,000 Miles
Wiseco 4.030" Forged -10cc Dish Pistons
Wiseco Steel Top Ring Set, Napier 2nd Ring Set Piston Rings
Lunati 6.125 Forged H Beam Connecting Rods
Lunati 4.00" Forged Crank Shaft
ARP 2000 Rod Bolts
ARP Main Studs
ARP 12 Point Head Studs
ARP Cam Bolts
Comp Cams Custom Grid Camshaft
228/234 .588/.576 114+0 (Split Duration)
Comp Cams 26918 Valve Springs
Comp Cams 772 Titanium Retainers
Thunder Racing Stock Length Pushrods
Velocity Ported and Port Matched 5.3 Heads
Heavy Duty Double Roller Timing Chain
60# Semiens Deka Fuel Injectors 107961
NGK BR7EF Spark Plugs

INTAKE MODIFICATIONS:
Stock Ram Air Baffle Delete
Al Austin Super Sucker Ram Air
K&N Air Filter
Fast Toys Performance FTP High Flow Black 98 mm Air Lid
Descreened ZO-6 85mm Mass Airflow Sensor
Custom Intake Bellows
Nick Williams 90mm Throttle Body
F.A.S.T. LSX 90mm Intake Manifold Ported and Port Matched

EXHAUST MODIFICATIONS:
Jet-Hot Long Tube Headers
Jet-Hot Y Pipe
Hooker “Cat Back”

OTHER PERFORMCE MODIFICATIONS:
March Performance Pulleys
Walbro 465 LPH DCSS Twin Turbine Fuel Pump (E85 High Pressure Intank Pump)
Upgraded Fuel Pump Wiring Harness
NX Nitrous Express 125 Shot Wet Kit
NX Bottle Heater
MSD Window Switch
Dual Innovative Motorsports Wide Band O2 Sensors
E85 Tuning by Carl CJ Tunes

DRIVETRAIN MODIFICATIONS T-56 M6:
RPS Street Twin Full Carbon Clutch And Flywheel 9/13
Tick Performance Adjustable Clutch Master Cylinder Kit
Strange S/T Series 12 Bolt Rear End (Rebuilt 5/10)
33 Spline Axels
3.73 Gears
Al Austin Short Stick Shifter

SUSPENSION MODIFICATIONS:
Eibach Pro Kit Lowering Springs
Lakewood Rear Lower Control Arms
Granatelli Motorsports Signature Series
Panhard Bar
Edelbrock Torque Arm
BMR Boxed Subframe Connectors

WHEELS/TIRES:
Boyd Coddington Smoothie II 18x9
Front: BFG 275/35/18
Rear: BFG g-Force T/A Drag Radials 295/35/18

MILEAGE: 27,500 miles

PERFORMANCE:
499.75 Rear Wheel Horsepower NA
518.63 Rear Wheel Torque NA

625.19 Rear Wheel Horsepower 125 Shot N20
742.33 Rear Wheel Torque 125 Shot N20

 

I would order an erl 454 short block and throw some used ls7 heads with a valve job and a little milling to bump compression. Fast 102 and a custom ground cam from one of the greats should definitely get it done I would think.

I see good deals on ls7 take offs all the time.