and a set of heads that would kick **** on it too

 

Right now I have a Comp custom grind, 214/220 .559/.564 116+4. Switching to a FMS cam very soon. Going just a little bigger.

 

This will be your third cam, correct? I see Tim Allen now..."More power..."

What are the charateristics of the cam you have now? Is there a noticeable bleed off of boost? Do you lose low end and gain it up top?

Wondering when you got the 2.75 pulley....and how your cam reacted to it.

 

I don't think there was any "bleed off" in boost. Not sure why blown chevy used that term with the LS6 thread, but I don't see it happening. If anything, there would be lower boost in the low rpms because of the increased duration. I don't mean to answer for you Ben, but I think it actually picked up boost from his previous cam on the same pulley size.

 

Yeah, 3rd one.

The cam I have now is a good cam. Builds boost extremely fast. I'm not sure what bleed off looks like, but may have a slight bleed off in the upper RPMs just before the shift. My boost peaks before the shift does, then declines some just before the shift -about 3/4 of a pound. I have a digital gauge.

Saw no differences with the 2.75" pulley for the cam. I have gone up a size now in pulleys to a 2.9". Trying to find the optimum setup for the Radix. Think I may have been spinning it past it's optimum operating point. I seem to have picked up power, although have not confirmed. Lost a pound and a half of boost (8.6lbs peak), but have been able to bump my timing up 3 degrees so far to 22 degrees. Still tuning it.

 

My new cam is a Compcams 228/234 .588/.598 115+4,I'll let you know how it works out in about 2 weeks.

 

Simply relaying information I recieved from the engine builder @ magna charger. When they tested the supercharger kit on the Z06 (LS6) they noticed boost dropping off in the upper RPM range, i.e. "bleeding off boost"

 

Interesting. I'm going to have to do some research on that.

Whitt1 - thats a big'un. Should make some power. Let us know how 7000 rpms feels in a 5.3 tahoe.

Ben, I'd think that losing a pound of boost and gaining 3* timing is a good trade off. If you can get it up another degree without KR, you are doing something.

 

That cam's not going in a 5.3,it's going in a 402 with TEA heads.

 

BigTex - I think I have picked up power with the 2.9" over the 2.75", with being able to add the 3* of timing. Hoping to get more out of it. Funny thing is on my gm/s readings, still maxing them out just as easily.