I just bought some DART Pro 1 Aluminum Platinum Heads and all I can find is flow numbers for the 215cc intake version. I bought the 230cc version.

 

http://www.mbeperformance.com/docume...%20PRO1SBC.pdf

 

Thanks, but that chart says its for the DART Pro 1 Aluminum set. I have the DART Pro 1 Aluminum Platinum series.

 

But that flow chart is reached from the Dart Pro1 Platinum Aluminumn series page:

http://www.mbeperformance.com/alumin...bly-p-106.html

 

they don't even compare to a ported stock heads of today for LT1's

Look at advance inductions flow numbers

 

Right, but I got these for $800 brand new.

 

and they need the same amount of work....they will perform better in the long run but don't think you will get away spending $800 on heads and set the world on fire

 

If they already flow more than the AI heads, why would they need the same amount of work?

 

The flow charts indicate that the DART heads flow better than the AI ported stock LT1 heads.

 

I must have looked at the wrong thing

 

Here is the data that I have pulled from the flow charts.

DART AI
.200" 160 147.7
.300" 206 204.6
.400" 247 247.4
.500" 280 275.1
.600" 297 283.7
.700" 307 284.6

 

So, I hear that the hp potential of heads NA is 2(CFM). Is that about right, or is there a more exact formula? What can I expect from these heads with my 427?

 

That is a good round about figure to use, but don't think that you are getting a 600 hp motor just because the heads might support it. Also you need to realize that the AI heads are 200cc ports where as yours are 230cc ports, big difference.

 

How much do AI 230cc heads flow unported?

 

No such thing as an AI "unported" head and they don't offer a 230cc ported stock head. I don't know if there is a way to get the stockers to that size. In either case your heads can flow a lot more if you spend the money to get them ported and there is no sense in comparing them to a smaller head that flows about the same. Also you have to think about the conditions the tests were preformed in meaning flowed with a bore fixture, radius inlet, pipe on the exhaust, etc. Comparing flow numbers isn't the best thing to do, but if you are going to then you need to make sure that as many variables are constant as possible. In this case I would use them as a guildline and just assume that you have a good head to start with since you are running a well established head.