Currently rocking a btr4 (235/242 111+3) on my c5z (stock bottom end].

upgraded to a ported 90mm tb, ported fast 92, and ported 243s. Here are my head flow numbers:

.200 159.5cfm
.300 235.5cfm
.400 280cfm
.500 298.6cfm
.600 305cfm
.650 309cfm
.700 314cfm
.800 318cfm

Is this cam still optimal for my setup, or would I benefit from something different? Looking for the car to haul ***, this is a fun car for me, don't mind the big cam. I have a good tuner and it drives real nice.

now if I only gain 5 rwhp...
not worth it to me to change out the cam. If I can gain 20rwhp, I may consider it. Let me know what you pros think. Thanks

 

Hows it do now power wise? Have you dyno'd it? What do you rev it to?

 

Those mid lift numbers (.300-.500) are very impressive! Not knowing the history but with the parts stated im sure That cam will shine a bit more!

 

my tuner doesn't use a dyno, he doesnt need it. But I was new to cars and excited to see what my car would dyno. Here is my dyno 437/416

 

Wow doesn't need a dyno, that is impressive.

 

Impressive Intake #s, what are the Exhaust #s?
If your exhaust/intake ratio is 73%+ from .300-.600"
a 4* exhaust split should pick up some mid-range
torque(3000-5000 RPM) without costing you
HP up to 6500 RPM. Also what is the lift on that
cam? You might be able to go slightly smaller
and get same top-end but gain more driveability
with something like 231*/235*, 114*+3*, .620"/.600"
worth a discussion with Kip @ Cam Motion to hear if
it is worth the investment. Depends how much street
VS strip/track driving you do.
with ported heads,intake,tb I would expect to pick up
25+ hp and more importantly 15-20 lb ft from 3000-5000
over previous combo with above cam.
My .02 & worth what you paid, LOL.

 

not sure the exhaust, I'll get ask for them when I pick them up next week. And .621/.592

 

Tuning by Shane Hinds, you can see some of the stuff he tunes on facebook. He does good work, knows his stuff

 

DYNO #s are pre- heads,intake, with BTR cam?

 

BTR4 cam, stock 243, ls6 intake, Air Intake, BTR springs, titanium retainers, BTR pushrods, 1 3/4 headers, 3in catless x, Borla stingers

 

280 cfm @ .400 in a 243 casting is damn impressive. As far as the camshaft goes, I would not change the it.

 

So who ported the heads?

 

Reid Sanders, formerly Sanders Inductions. He is now with Venom Racing Engines. He does a lot of high end builds

 

Any idea what the port volumes are? Curious above valve size too. I assume these heads are hand ported only.

 

He developed his own CNC program. And then he gave them a nice valve job. They are stock sodium filled z06 valves. And I'm not sure on the port volumes, I'll ask for that as well when I pick them up

 

Yep, those heads could see a 40hp increase

 

Nice numbers!

Now lots of questions. What type flow bench? What size bore? Was this as 28 inches of pressure?
What did the exhaust flow?

 

I asked him, I'll see what he says. But overall, general cocensus is saying stick with this current cam?

 

Thanks for the kind words guys. To answer some questions,

port was flowed on a 4.030 bore on our superflow sf600 bench. 28" of depression is industry standard so that's where these were flowed.

as far as exhaust numbers go, I haven't flowed it as I feel the flowbench does not replicate what happens on a running engine as far as exhaust goes due to the huge pressure differential that comes from the combustion event.

feel free to PM me with questions. Or our shop number is 618-709-7717

 

PM sent.