I did not know that Speed Inc sold SLP shortblocks. KJ@ SDPC(sponsor) ----> is selling LS2 402 shortblocks for $3995 with some pretty good parts, and with everything needed other than heads,cam + intake.

 

i am real happy with my 408, i think cubes do matter. here is a gtech screen shot from my truck with several diferent motors, seems to me the 408 is making the most power with the least boost/nitrous. http://www.neufamily.org/images/40815psisp.jpg keep in mind with the 408 i am smoking all 4 tires out of the hole and i was able to hook with the other set up's, with some traction and drop the extra weight and the 408 will be killing the 6.0.

the extra cubes made a huge diference in fun factor too. instant boost

 

The bigger the cubes, the more power you make with just the motor.

I'd just go small cubes and low compression and run some BOOST.

I'm hitting 19-21 psi right now.

 

I have made up my mind. I am going with the SLP 402. Hopefully, I will have the time to call Speed Inc this week. To pretend adding cubes would not ultimately enable more power down the road is just not logical. Besides, adding cool engine covers and running a more unique setup will be more fun for car shows. Here is a link to the website:

http://www.ls1speed.com/engine402L.cfm

If you guys know any contacts at this place, or if you have any experience dealing with these guys, I sure would appreciate more input.

 

I've been using Speed Inc. for stuff for like five years. My car is there right now. They have been tuning my car and doing alot of the custom work on my car for the last two years. You are in good hands.

 

John,

That's great news. I just sent them an email to see if I could also arrange for them to do the tune? Thanks everyone for the info. . .

 

They have tuned a lot of 475-850rwhp combos.

 

Could that have been a break-in procedure problem?