98z28CamaroJG

iTrader: (7)

I'm planning on ordering a TSP LQ9 408ci long block good for Nitrous that will be used for Street Driving, Road Racing, and Drag Racing. I want to maximize the power I can get out of the motor, so let me know if you would change any of the long block choices I made to make more power. I also have a few questions as well I hope someone can answer.

Wiseco -8cc Dish Pistons
Wiseco Steel Top/Napier Second Ring Set
Callies Compstar I-Beam Connecting Rods
Callies Compstar Crankshaft
PRC Stage 3.0 LS6 64cc Heads
Cometic Head Gaskets
Harland Sharp 1.71:1Non-Adjustable Rocker Arms
Texas Giant Camshaft
PRC EHT .675 Dual Valve Springs
ARP Bolts used Throughout

A few Questions I have:

Would you prefer K1 Technologies or Callies?

Are I-Beam Connecting Rods worth the extra money over H-Beam?

Are the PRC Stage 3 LS6 64cc Heads a good match for what I want, or should I go a different route? Such as PRC 215cc 62cc or PRC 227cc 60-62cc?

Did I choose good Rocker Arms for what I want to do with my motor?

Should I upgrade from GM LS7 Roller Lifters to Comp Cams "Comp R" lifter?

What Cometic Head Gasket Thickness should I use? .041, .045, or .051? Or would you recommend the GM MLS .058?


Thanks for your time guys! I plan to have this motor using a Fast 102/102 and TSP 1 7/8 Headers eventually. Immediately it would be using an LS6 Intake with Ported and Polished Throttle Body off my LS1, and my Pacesetter 1 3/4 Headers. Even with the LS6 and Pacesetters I'd still like to break the 500rwhp mark.

raymond mckinney

iTrader: (4)

I would use the Prc 227's heads and the Fast and 17/8 headers it would make a more rounded combo.

98z28CamaroJG

iTrader: (7)

Any reason why the 227 heads and not the stage 3, 215, or 237?

raymond mckinney

iTrader: (4)

Well a 237 would be even better but didn't see you mention them in your post. Reason I said them is because of your 500 rwhp goals and they have better mid and upper flow numbers over the ls6 heads which will help you reach your goals easier.

98z28CamaroJG

iTrader: (7)

I gotcha. What does the change from 64cc (stage 3) to 68cc (237) do? Is it better to have less or more of that measurement?

slow trap

iTrader: (22)

get the 237's and the pistons will probably be .008 to .010 out of the hole ( just guessing you will need to check ) so a .045 or .051 cometic will give you a good quench.
the harland sharps will be fine, that is what i have on my 237's. the ls6 intake will definitely be a restriction. later on the fast setup will really wake it up.you will need bigger injectors if not already upgraded. 42 lbers will work great.if you can run 93 octane i would get the scr atleast 11:7 or so. your dcr will still probably be mid 8 range which should be no problem.
it should break 500rw even with the ls6. with my cutout open on my 408 with ported 243's,fast 90/90 ported, 1 3/4 headers, 244/248 cam my rw is in the mid 53x range. m6, 9 inch,3;89 cogs.

98z28CamaroJG

iTrader: (7)

Awesome information thank you! So i take it the more 2xx cc you have the more power you make? And the 6x-7x cc doesn't really matter?

slow trap

iTrader: (22)

yeah the extra cc's slows down your velocity some but with your cubes a 237 cc head will work great. especially with a properly built setup.have them to get you around 11:7 or alittle more scr / atleast 8:5 dcr and you will have a great running setup.

raymond mckinney

iTrader: (4)

You could have Tsp mill the heads to whatever you like for around 100 more dollars. Shoot they may even give you a better deal on the milling.

98z28CamaroJG

iTrader: (7)

That's a thought too. Do I just ask ask for them to mill to the maximum or is there a certain point that it would be too much?

raymond mckinney

iTrader: (4)

Call Tsp and discuss what piston and head gasket thickness you are running and what compression you want and they will tell you where the chamber size needs to be to reach your desired compression. Im thinking you will want to be around a 62-64cc chamber.

98z28CamaroJG

iTrader: (7)

yeah i was looking more into that 6x cc and it sounds like i would want it lower than 68cc. Apparently the lower it is the more compression there is, so more horsepower and more torque. Hopefully I can get the 237 Heads in a 62-64cc, even though it wasn't an option. I'm pretty sure the Wiseco -8cc Dish would match that, I just need to figure out what gasket thickness would bring it all together. I'll give them a call tomorrow for sure