LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Nice quality Valve Train

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Old Jul 7, 2011 | 03:51 PM
  #41  
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The Cam was in the motor when I got it and just dropped it in with better supporting mods and WAY better tune for N/A now the motor has mid 11's in it for sure even with the "Junk" CC306 in it
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Old Jul 7, 2011 | 04:20 PM
  #42  
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My .2 is run the cc306 with 1.6 rr's then in a year or so get a custom cam and compare that apples to apples and see how junk it really is. I bet it will be faster but not as much as everyone thinks.
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Old Jul 7, 2011 | 04:26 PM
  #43  
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Well just got a bunch of stuff that sold here recently which is helping with the cash deal going to save it wait till I drive the car for a solid week with no mess ups or bugs then pour that money into Tires and Suspension for it and then hit the track and start dialing it in from there.
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Old Jul 7, 2011 | 05:38 PM
  #44  
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Originally Posted by Wicked94Z
Not sure where you're coming up with these ideas? Peak lift has very little to do with it. You need to control the exhaust gas velocity or you can lose power. CC306 already has a WAY too early EVO and increasing the rocker ratio will only decrease exhaust velocity further.

I was just trying to say that in my opinion 1.7 intake and 1.6 exhaust would probably work better then the 1.8 and 1.6. On paper it looks better, But how it actually works in an engine i dont know.

But your right, i didnt take into account the already funky specs of the cc306.
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Old Jul 8, 2011 | 10:27 AM
  #45  
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Originally Posted by quik95lt1
holy post full of assumption...........btw.....higer ratio rockers open the valve more and faster.........ie more .050 duration........just food for thought
Originally Posted by Puck
Yes there is.

Longer dwell at peak cfm.
My post is full of assumptions but these aren't????? If the head flow plateaus at .XXX lift but you open it more, the **** is the point? I dono, I don't get paid to do this.
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Old Jul 8, 2011 | 10:43 AM
  #46  
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Originally Posted by sweetbmxrider
My post is full of assumptions but these aren't????? If the head flow plateaus at .XXX lift but you open it more, the **** is the point? I dono, I don't get paid to do this.
lol read my post and actually pay attention to the second half of the sentence this time
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Old Jul 8, 2011 | 10:46 AM
  #47  
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Originally Posted by sweetbmxrider
My post is full of assumptions but these aren't????? If the head flow plateaus at .XXX lift but you open it more, the **** is the point? I dono, I don't get paid to do this.
You realize a cam rotates, right? If it has more lift, that means it spends more time wit the valve further open...
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Old Jul 8, 2011 | 05:55 PM
  #48  
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Originally Posted by gregrob
You realize a cam rotates, right? If it has more lift, that means it spends more time wit the valve further open...
Easy now.. Lets only teach one thing at a time. lol
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Old Jul 8, 2011 | 06:30 PM
  #49  
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aw ****! thats what that chain is for?
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Old Jul 8, 2011 | 08:52 PM
  #50  
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Originally Posted by sweetbmxrider
My post is full of assumptions but these aren't????? If the head flow plateaus at .XXX lift but you open it more, the **** is the point? I dono, I don't get paid to do this.
You can't be serious. I'll try to give some comparison examples...

Valves don't work like Digital signals where they are ON or OFF going from closed to max lift (|-|_|-|_|-|). Their lift can be graphed in a sine wave like AC current, with gradually increasing and decreasing lift over time (_,~^~._,~^~._,~^~.).

If the valve barely reaches the point of the heads peak lift, it is only at that max cfm for a very short period of time - the tip of the wave. If it has more then the heads peak lift, it is still limited by that same max cfm but stays there for much longer - the tip of the wave and both sides of it.

Surely it's not that complicated .
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Old Jul 8, 2011 | 10:27 PM
  #51  
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Originally Posted by Puck
You can't be serious. I'll try to give some comparison examples...

Valves don't work like Digital signals where they are ON or OFF going from closed to max lift (|-|_|-|_|-|). Their lift can be graphed in a sine wave like AC current, with gradually increasing and decreasing lift over time (_,~^~._,~^~._,~^~.).

If the valve barely reaches the point of the heads peak lift, it is only at that max cfm for a very short period of time - the tip of the wave. If it has more then the heads peak lift, it is still limited by that same max cfm but stays there for much longer - the tip of the wave and both sides of it.

Surely it's not that complicated .
LOL
We need digital cams. Maybe AI has them. Flamesuit on.
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Old Jul 8, 2011 | 10:42 PM
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Originally Posted by wrd1972
LOL
We need digital cams. Maybe AI has them. Flamesuit on.
They actually showed me the cam dr graphs for a few cams, pretty interesting stuff. Acceleration rates + area under the curve, ect.
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Old Jul 9, 2011 | 09:50 AM
  #53  
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Originally Posted by Puck
You can't be serious. I'll try to give some comparison examples...

Valves don't work like Digital signals where they are ON or OFF going from closed to max lift (|-|_|-|_|-|). Their lift can be graphed in a sine wave like AC current, with gradually increasing and decreasing lift over time (_,~^~._,~^~._,~^~.).

If the valve barely reaches the point of the heads peak lift, it is only at that max cfm for a very short period of time - the tip of the wave. If it has more then the heads peak lift, it is still limited by that same max cfm but stays there for much longer - the tip of the wave and both sides of it.

Surely it's not that complicated .
But lets say you have a runner that goes turbulent right after the lift at which peak flow occures and flow drops off dramatically at higher lift numbers.

If your lift at peak flow is x, and your cam had a max lift of >x, like your saying and advocating you would be spending more time at peak flow but you could also be spending more time at a lift with lower flow.

I dont think more lift is always better, it all depends on the heads
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Old Jul 9, 2011 | 11:30 AM
  #54  
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Originally Posted by TAEnvy
But lets say you have a runner that goes turbulent right after the lift at which peak flow occures and flow drops off dramatically at higher lift numbers.

If your lift at peak flow is x, and your cam had a max lift of >x, like your saying and advocating you would be spending more time at peak flow but you could also be spending more time at a lift with lower flow.

I dont think more lift is always better, it all depends on the heads
It ALWAYS depends on the heads . It the port job is crappy and it stalls and drops dramatically after peak, then you don't want to push the lift too far. If it flatlines and holds peak cfm, then you would benefit more from using a cam with higher lift then where the head peaks.

He specifically stated on a head whose peak cfm plateaus though, and not drops off fast.
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Old Jul 9, 2011 | 12:44 PM
  #55  
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Have none of you guys ran 1.8s or up on even a SBC? Im wondering what kind of power you could make with the stock cam and big rockers. Is
320+rwhp out of the question with an M6? And what about longevity for DD purposes.
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Old Jul 9, 2011 | 02:17 PM
  #56  
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Stock cam, stock heads and rockers of any ratio isn't making 320+ rwhp, or really anywhere close. The infatuation to test big ratios is bewildering - this isn't uncharted territory, guys.
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Old Jul 9, 2011 | 07:47 PM
  #57  
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Originally Posted by SS MPSTR
Stock cam, stock heads and rockers of any ratio isn't making 320+ rwhp, or really anywhere close.
I think it can.
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Old Jul 10, 2011 | 04:12 PM
  #58  
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Originally Posted by TAEnvy
But lets say you have a runner that goes turbulent right after the lift at which peak flow occures and flow drops off dramatically at higher lift numbers.

If your lift at peak flow is x, and your cam had a max lift of >x, like your saying and advocating you would be spending more time at peak flow but you could also be spending more time at a lift with lower flow.

I dont think more lift is always better, it all depends on the heads
WOW, THANK YOU! Real World > ls1tech theories


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Old Jul 10, 2011 | 08:37 PM
  #59  
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Originally Posted by sweetbmxrider
WOW, THANK YOU! Real World > ls1tech theories


He specifically said on a head that levels off at peak cfm - not stalls.

It is highly unlikely that a head will just plummit after it reaches peak cfm. If it does, it is a horrible port job. More likely is that the flow levels off for a bit, making greater then peak cfm lift a benefit.

Its not a new concept, and its not theory.
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Old Jul 11, 2011 | 12:14 AM
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Originally Posted by SS MPSTR
Stock cam, stock heads and rockers of any ratio isn't making 320+ rwhp, or really anywhere close. The infatuation to test big ratios is bewildering - this isn't uncharted territory, guys.
I think brady did that or atleast got really close.

Ive seen alot of M6 cars dyno over 300rwhp, and none of them had everything done, missing rockers, ewp, tb something. I dont think its too far fetched.
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