JeremyR

Thinking about going with a bigger cam, what would you go with?

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
Computer 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

HCI2000SS

iTrader: (2)

What kind of 5.3 heads are you running. I run PRC stage 2.5/5.3 heads on my 370 LQ9 with a cam quite a bit bigger than yours, and it's none to big IMO. Mine is 612/612 lift, 236/244 duration, 113+4 LSA. I'd go bigger than that on your 408

JeremyR

The heads are from a speed shop up here in MN that blows engines up, including one of mine, so I'd rather not say. They are epoxied and port matched to my FAST 90. They made 485RWHP on my 346 so I just reused the same combo on my 408 to save costs.

I know there is more left on the table.

A.R. Shale Targa

iTrader: (2)

You should be able to add at least another 10-12 degrees of timing to both the intake and exhaust with an engine that big. Call several of the cam guys for suggestions. Goeff @ EPS, Martin @ Tick, Brian Tooley, Texas Speed, Ed Curtis, will all get you more power.

HCI2000SS

iTrader: (2)

Gotcha! So you only gained about 15 hp on the 408 with the same top end that you had on the LS1 before? Same dyno as well?

JeremyR

Different dyno but same kind. +15 peak RWHP almost + 100 RWTQ and on the street it is way more SOTP and unfortunately way more tire spin. There is also way more power under the curve.

RockinWs6

Could always buy a air force surplus jet engine and strap that onto the hood.

JeremyR

Would it work with my E85 tune?

HCI2000SS

iTrader: (2)

Oh wow, I didn't even see the torque lol. That is a huge difference lol

"MAC"

iTrader: (1)

Damn lol making big power already!

JeremyR

You always want more.

"MAC"

iTrader: (1)

Lol touche!!! Good luck my advice call comp cams and see what they say they helped me out very well and the service was very good.