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Dart 225 head question????

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Old Mar 13, 2006 | 07:51 PM
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Default Dart 225 head question????

Hey guys,
I have a set of dart 225 heads with 2.055/1.60 valves that i am wanting to install on my car. Its a stock bottom end 346 with a 224/224 .576/.576 on a 112lsa, full exhaust, ls6 intake and all bolt ons. I am wanting to have them sent out to be ported but not sure how big the intake runner should be opened up too? I have been told by a very good porter (not sayen names) that he would open it up too around a 240cc intake runner. What do you guys think of that or what size would you guys open it up too? I personally think it may be too big for my 346 but just wanted some input, i was thinkin of haven them opened up to around a 230cc intake runner. Any input is appreciated!!
thx rob
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Old Mar 13, 2006 | 07:53 PM
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Originally Posted by Bigrob339
Hey guys,
I have a set of dart 225 heads with 2.055/1.60 valves that i am wanting to install on my car. Its a stock bottom end 346 with a 224/224 .576/.576 on a 112lsa, full exhaust, ls6 intake and all bolt ons. I am wanting to have them sent out to be ported but not sure how big the intake runner should be opened up too? I have been told by a very good porter (not sayen names) that he would open it up too around a 240cc intake runner. What do you guys think of that or what size would you guys open it up too? I personally think it may be too big for my 346 but just wanted some input, i was thinkin of haven them opened up to around a 230cc intake runner. Any input is appreciated!!
thx rob
That ported runner volume sounds way too big for a 346. A 383 would be fine tho.
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Old Mar 13, 2006 | 07:59 PM
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Even unported that's a pretty big runner for a 224 cam. A nice set of cleaned up only 215's would probably be better.

My $.02
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Old Mar 13, 2006 | 08:03 PM
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I understand that, i purchased these head dirt cheap. But also if i was to purchase say a set of 243 cnc'd heads from a vendor, the runners would be opened up to 230+cc anyways unlike these which are a 225cc. The only real difference i gunna be the valve, and i know they have a 2.05 but thats really the only downside. I also thought about haven them hand finished. Any other thoughts.
thx rob
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Old Mar 13, 2006 | 09:20 PM
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anyone else have any input on this? I know more that two people do.
thx rob
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Old Mar 13, 2006 | 09:37 PM
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I'm running 225 dart heads that are hand finished and coated.
The intake flow is very good from factory. Search for thread started by me for flow numbers and dyno sheet i have a 220/226 cam and standard displacement motor
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Old Mar 13, 2006 | 09:44 PM
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Do you by chance have any flow numbers of what your flowed before and after you hand finished them? Did you pick up any cfm, if so how much?
thx rob
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Old Mar 13, 2006 | 10:30 PM
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Originally Posted by Bigrob339
Do you by chance have any flow numbers of what your flowed before and after you hand finished them? Did you pick up any cfm, if so how much?
thx rob
Below are the flow numbers we picked up quite a bit if the exhaust side.
As you can see from the dyno sheet we are at 404 rwhp
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flow.pdf (81.9 KB, 124 views)
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Old Mar 18, 2006 | 07:43 PM
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http://forums.corvetteforum.com/show...733&forum_id=1
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