Here is the details. I also have pics and video posted.

http://www.ls1tech.com/forums/showthread.php?t=529823

 

that's damn impressive. makes me more and more anxious to see what my engine will do with some heads.

what are the specs on the heads? i've tried contacting TSP about them, but they don't seem to respond.

whats the intake runner size? combustion chamber? flow at .550 and .600" lift?

 

The flow at .600 is 307 w/out the competition valve job. I think they said the valve job raises the flow almost another 10 cfm or so.

Stock 2.00/1.55 valves, and the more results I see...I am starting to doubt that these heads really need much bigger valves than stock. And maybe even the ls1 motor in general...for a cam the size of mine...massive cams may like the bigger valves...but I really dont think a mid size cam needs them.

Im not too sure on the intake runner size...but I know it is on the larger side...and people were doubting the numbers they would show...but the excellent results just keep coming from these heads...do some searching on ls1 tech and Im sure you can find out a lot more. They are w/out a doubt the best bang for the buck head right now IMO.
The key to good numbers..and especially torque, is setting up your dynamic compression ratio correctly. My torque wouldnt have been nearly as good if it wasnt for the 8.6 dynamic compression ratio I set the motor up with by using the .040 cometic gasket on the 64cc heads.
Thats why you see so many guys with 440rwhp and 390 rwtq...not high enough dcr. Torque and horsepower should be fairly close to each other if set up properly.

 

Intake runners are in the 240cc range. Huge, but they still seem to make torque down low. Again, the LSx series has me stumped. A huge runner like that shouldn't shine quite so wheel on a dynameter.

I'd spring for the valve job, so you wouldn't regret it later. Add a nice set of springs, and you're back at the current cost of Darts. So, that makes the decision on what heads to buy even more difficult. All-in-all, these heads represent a great value, and according to a recent dyno test conducted at Total Engine Airflow there is no reason to doubt that these heads and a 90/90 set up would make just as much power as the more expensive (premium) LSx heads with an LS6 intake.

Ben T.

 

I havent seen many cars with a cam the size of mine w/out the 90/90 hit 424 rwtq on a mustang dyno....reguardless of the head that is used.

A couple people with set ups very close to mine are hitting 440 rwhp + on dyno jets...these heads rock

 

What did your dynamic compression work out to be?

Ben T.

 

a little bit over 8.6

 

wow..that's a huge freaking intake runner.

i will be very interested to see how the dynojet does