the idea here is that.....there is a maximum amount of air that can flow through any given size port.............a port with of size X has a physical maximum amount of air that can flow through it.................however people are claiming that they can flow more than the physical maximum.


take a hollow piece of pipe...........and lets say due to its cross-sectional area, in absolute perfect conditions it could flow 300cfm peak.

then some guy claims he made it flow 350cfm.

it just aint happening........even if you had absolute perfect skills (which no one does) .


no one is saying the guy is a liar, and im sure they will provide him with flow sheets that SAY the heads flow what they claim..............but from my understanding, it is pretty easy for a shop to make a flow bench say what they want.

 

Poor Phil, he's so misunderstood

Some people just dont get it that he's just trying to help (this isn't the first time a thread has gone this way.) He's just trying to let you know that you may wanna have the heads flow'd by an independant shop, to verify these numbers.

I'm sorry, but when someone who does this stuff for a living tells me not only that the numbers seem high, but are IMPOSSIBLE to get, that's gonna make me curious as too if i'm beeing BS'd or not.

 

What phil is saying is that picture the pushrod pinch area. its a perfect rectangle, so its not too tough to calculate at a 28" pressure drop what kind of flow you can get. no way can the port flow more, period.

 

I'll chime in too. Disclaimer: I am not a head expert. But just incase the point hasn't been made, there is no such thing as a stock (non-welded) LT1 casting flowing >300cfm. And 315 (the 305 plus the 10cfm more the guy said he could do) is getting into Dominion 32V territory.

I am certainly not calling RCF925 a liar. Just saying that I don't see how the heads could flow what he was told if the conditions were "standard". If I thought the figures were accurate, I'd be buying a set!

Rich Krause

 

That's a lot better than calling someone a liar. Misled, perhaps, but calling someone a liar (or insinuating it) isn't warranted.

I would also be VERY curious to see an independent flow test. I'm sure we could all pitch in a few bucks. If it turns out this is true, I'd really like to get the contact of this guy.

 

Boy it seems like I really struck a nerve on this board. You are all so quick to call BS. obviously it's pointless for me to try an argue this because I didn't port the heads. Plus it is stupid for me to argue over the internet because everyone on here seems to know the absolute limit on Lt1 heads.

Got Hp what kind of a guy searches around on the internet for pictures of dogs screwing each other... honestly get a life.

 

We may disagree on heads, but at least we agree on one thing

Rich Krause

 

I'm not calling BS. I know nothing about porting LT1 heads. However, more people than not are questioning it. Also, these same people probably would want to know that if these are accurate flow numbers, how it was done, and how to recreate it.

I am one of the latter. Perhaps you can post pics of the heads? Like I said, I am REALLY interested.

 

Here is my numbers
LIFT INT EHX
.100 74 69
.200 127 121
.300 191 152
.400 254 183
.500 283 192
.600 287 201

 

How much does it cost to flow a set of heads at an independant shop. Here it is only $35. With that, I will put up $5, come on now we only need 6 more people to toss in $5. After the heads are flowed, if they flow 300+ cfm, put me down for a set. This is just what I am looking for.

 

ask the guy who made the picture and operates the website, its not mine, i just used the image to inject some humor into this discussion, although your naiveness was entertaining on its own merit.


dont get your panties in a wad........no one here called you a liar, people are just simply stating that you were misled.

ill be willing to add $5 to the fund started by Black_Z to get the heads independently flowed, just for ****sandgiggles.

 

I talked to my engine builder and he's just about ready to do another set of LT1 heads for another customer. the flow bench he uses is another independent builder who really doesn't have a stake in this or is biased, or trying to rip somebody off. Before any of you said why don't you take them to another independent builder to get flow tested he already mentioned it to me. Since my heads are all ready on the motor he said he will have the next set he's doing flow tested on 3 different testers, 1 of which is probably someone you all would recognize ( Johnson Racing, Santa Maria, Ca.) It might be a few weeks before there done but as soon as he has the numbers I will post them.

 

The flown# kinda high on the LT1 heads, Most Lt1 heads flown 250-270cfm. I got mine flown at Agostino resulted 256cfm on my LT1 heads.


Bruce
93LT1 Conv w/ZF6
Blown D1-SC/N2O
ARE built 383ci/Stage II heads

 

There is a Pro Stock engine builder in New Orleans that has the latest and greatest flow bench (don't remember the model number). These guys port heads that flow well over 400 cfm. We brought in a set of expert-ported Brodix SUPR 23 degree aluminum heads and they flowed 295 cfm. The shop owner was very impressed - adding that he has NEVER seen a set of 23 degree small block heads flow over 310 cfm regardless of port size, so 295 was excellent.

Thunder Racing has done testing of numerous companies' "330 cfm" LS1 heads, only to find that they all flow around 280.

Think AFR 190's are good? They only flowed 233 cfm at Thunder.

AFR 210's? Not too bad, at 280 cfm.

In light of this, I've gotten to the point where I don't believe anything over 300 cfm in 23 degree SBC heads.

I HAVE seen LS1 heads flow over a true 330 cfm, but they aren't 23 degree heads, are they?

Mike

 

So really, let's settle the debate here (at least for me):

Same person ports the heads, is there any significant advantage over going with a different set of heads than stock?