I'm considering adding a RADIX to my already modified LQ4. However, I've been trying to find a before and after dyno chart to no avail. There is none listed on the Magnusun web site and I've had Tony there at Magnusun Products checking for a couple of weeks. He says that he is still looking, but he hasn't come up with anything yet.

Can anyone help this boy?

Thanks,

Steve

 

I have before numbers in my sig. Posted a graph about two months ago on it too.

Was supposed to get the "after" dyno last week but complications at the shop precluded it. Also, after ATAPing I found out I have a little knock. Should have some results soon.

 

Thanks Kevin!

Steve

 

Didn't I read where that was an iron head 6.0L? I don't think those motors make the same power as a good aluminum head LQ4.

 

The 1999 and 2000 year model LQ4 has cast iron heads that flow identically to the stock LS1. These heads have round exhaust ports and do not flow on the exhaust side as well as the D port 317 heads. Also, the do not dissipate heat as well as the aluminum heads. The iron heads are considered better for torque and the aluminum heads are better for HP. I kept the iron and ported them and have had them flow tested. They work very well for me as I'm all about torque.

See attached Pictures. I've also included the before and after on the oil pump outlet porting.

Regards,

Steve

 

I was kinda hoping that was the case since my dyno was low. If this is true then I don't really need new heads just maybe a cleanup and a cam. 317 would be light though.