That rule only applies when the scales for hp and tq are the same. They are not on this graph.

 

95bird,

Nice numbers, you are right there are many more factors and flow benches are just one piece when it comes to porting from everything I have heard.
I had my heads flowed by two different shops and there was a 21 cfm diff.

What kind of lifters are you running?
When I called thunder racing they mentioned your car. I was asking questions about a solid roller.

I really like your car, your one of the reasons I went to a solid roller. I want to run high tens NA
I had Joe Overton custom grind a cam for me and re-port my Lingenfelter LT4 heads

Thunder racing mentioned that you have done a lot of suspension tweaking to run those times would you mind giving me some advice once I get my engine in?

 

This is what I was thinking also. I read some magazine that the better the head the less duration cam you will need to make the same power. As a head that is not as good will need more duration. So a head that does not flow all that great will benefit a lot more from a bigger cam and more duration. Is this true? I see a lot of people on here say that a big cam on the stock unported head will not make much power and is a waste of time pretty much. I dont think that is true. Am I wrong?

Also you have good ex numbers. Did you have your EX ports ported? And did you leave the Intake ports alone besides maybe blending the bowls on the intake and or a valve job? Is that the head flow numbers with the intake attached? If so are the intake ports of the head also ported? If so what does the head flow without the intake?

 

How much does this car weigh?

 

That's a good point. Hence all the big cams in LS-1's making huge power on stock heads, but not doing so well when you add ported heads. It's all about the combo. Some of my best runs were made with flow numbers similar to 95's.

 

So when are the SB2.2 heads going on??

 

Thanks for the compliments everyone. Lets hope the new stuff puts down even better track numbers.

yep..exactly right.

sounds like you have been there.

My cam has .657 lift on the intake...my heads flow 229-230 in that lift range. People more knowledgable than me said you should look at the flow at your peak lift..not the max flow of the head. If it were that easy I would expect to see more small cube cars running better.


TCAL95Z - I have a comp lifter in there..can't remember which one exactly. I pulled them the other day hoping they were stamped with a part number but I didn't see one. I plan on looking again alittle harder. I've been "tweeking" my suspension for 2 years. The harder I would hook it would break something and then I would have long down times. ive been through tranny output shafts..tweeked the splines on imput shafts, broke a slip yoke or 2 and chunked my driveshaft at the 8th doing 100 mph...and we aren't even going to get into the syncros..lol. I finally eleminated all the weak links and it went right into the 10s. I will help you any way I can...my suspension is kinda radical for what I would consider a street car but can easily be modified for track/non track duty and would be just fine. Thanks for the kudos.


I think you guys are missing the point here. I posted this to show that its not all in the peak flow numbers but the quality of that flow and many other factors in a head that make a car actually run good. Remember..the head is where the power is at...cams can only work with what is delivered to them by that head and the "quality" of that air/fuel. My cam on a stock head would be down at least 70 hp from my numbers I would bet..maybe more. My initake and exhaust runners are both ported. If all it took was a cam to make power then more people would be doing it. There are also people with much better "flow bench" heads and cams alittle smaller than I am and are off anywhere from 30 to 60 hp. The only guys I see that are even close...some with even better hp numbers that I put down... have heads that flow just a little better than me on a bench and have compairable hyd. cams. You will notice that my intake runners are 177 CC compaired to 170 CC stock runners..so yes they have been ported and all flow numbers were with no intake on. I will have flow numbers with the intake on next week or so...the intake has been ported and matched to my intake runner. Also remember this was done through a 9" rear end and 4.71s...add about 15 rwhp to those numbers if you want an idea of what it would do with a stock rear end.

10 sec passes were made in the 3420 - 3430 range in +800 - +1000 DA. No light weight car here. Better than stock but not a feather weight by any means. The 9" and cage added ALOT of weight to the car. Think what the car would have ran in our -DA winter weather


Ls1s have a 15 Deg valve head...different ball game there. I wish I had a 15 deg head to level the playing field..then I would be kicking some ls1 butt way too easy..I like a challenge . And your right..the combo is the secret..along with some pretty nice heads that don't show their stuff on a bench.hehehehe.


As soon as you send me some

Tim

 

LOL, don't hold your breath.