Ported vs Stock 3400 Head flow sheets

[SappySE107]

Ive got plenty of numbers here. I used the best case scenario on the stock heads. I have seen some that flow considerably worse than the one in the comparison. I could have used the worst flowing heads I have flowed but I figure ill be more than fair on this. I will eventually have all the flow numbers up on the various castings so give me some time.

I will be ccing the chambers of both the stock and ported heads of which these numbers came from. The flowmatched sheets show what will be an option for my services. Very time consuming process to match them as close as I did. Not sure on pricing yet or how I will break it all down. This was the result of months of testing on the flowbench and the patience of a customer who is getting this set.

Stock Intake/Exhaust flow ratio

http://60degreev6.com/filestore/Store/Flowsheets/3400/Stock%20IE%20ratio.jpg

WOT-Tech Ported flow ratio

http://60degreev6.com/filestore/Store/Flowsheets/3400/WOT%20Ported%20IE%20ratio.jpg

WOT-Tech Ported intake and exhaust numbers

http://60degreev6.com/filestore/Store/Flowsheets/3400/WOT%20intake%20and%20exhaust.jpg

WOT-Tech flowmatched exhaust numbers

http://60degreev6.com/filestore/Store/Flowsheets/3400/WOT%20matched%20exhaust.jpg

WOT-Tech flowmatched intake numbers

http://60degreev6.com/filestore/Store/Flowsheets/3400/WOT%20matched%20intake.jpg

WOT-Tech Ported Exhaust vs Stock Graph

http://60degreev6.com/filestore/Store/Flowsheets/3400/WOT%20vs%20Stock%20exhaust%20graph.jpg

WOT-Tech Ported Exhaust vs Stock Numbers

http://60degreev6.com/filestore/Store/Flowsheets/3400/WOT%20vs%20Stock%20exhaust.jpg

WOT-Tech Ported Intake vs Stock Graph

http://60degreev6.com/filestore/Store/Flowsheets/3400/WOT%20vs%20Stock%20intake%20graph.jpg

WOT-Tech Ported Intake vs Stock

http://60degreev6.com/filestore/Store/Flowsheets/3400/WOT%20vs%20Stock%20intake.jpg

I used a tube on the exhaust side and a clay opening on the intake to smooth the airflow (bell shaped entry). The CC numbers are vital to understanding how these heads will work in the real world so I will work on that right now.

[SappySE107]

Well that is interesting. The ported heads are casting 24507487. The stock heads are 10218170. The interesting part is the port volume.

110.6cc stock intake
70.6cc stock exhaust

113cc ported intake
70.2cc ported exhaust

I certainly didn't add any metal to the exhaust. The last time I checked I had removed 1.2 ccs on the intake, not 2.4. So, best of luck to everyone on figuring this out:P I was hoping to show that I removed the least amount of metal possible to get these flow gains. I know I can get more flow on the exhaust side by opening it up more as I have done it. Didn't suit this application though for the velocity difference for the higher lifts to get a better improvement. I focused on the low/mid lifts instead.

[matt_p]

The Gen III heads flow so much better than the Gen II heads. Maybe make a comparison post.

The heads were revised in 2003. Maybe one of those castings is an 03 head.

[SappySE107]

Unless they went backwards in numbers for castings, its an older head that outflows a newer one for the 3400 style heads. Id like to get an 03 head now though as I wasn't aware they changed anything other than for the 3500.

I can do put the different heads into that template table brad made.

[El_Diablo]

did you ever figure out if the 3500 top end would bolt up to the 3400 bottom end?

[SappySE107]

The 3500 lower won't bolt up to the 3400 head. The 3500 plenum bolts up to the 3400 lower which is how I got that flow spec. I still have yet to port match the 3500 to the 3400 and flow it.

[El_Diablo]

no, i meant head and everything, there was a thread but it has long since died

[SappySE107]

Oh, i dunno. I dont have any heads here.

[El_Diablo]

okay guys, who wants to get ben some heads for his birthday?



i would love to see some flow comparison numbers and see if they bolt up... hope you get some in your hands soon

[SappySE107]

Im broke...so unless things turn around ill not be getting anything new to be testing out:P Colin has a set but he is in canada so that could be ugly on shipping. I would only need 1 head unless someone wants me to do testing for a ported set.

[El_Diablo]

Im broke...

im with ya there, car part has the lowest listed price as $125, maybe i could get ahold of a set if i can ever get payed bck the money im owed

[onefastV6]

Ben I forgot to get you the casting #'s off the heads that I have. I believe they are the 03 heads as they have the M8 rocker studs instead of the M10 used in the earlier models.

The # on the heads is 24507487 on the side of the heads then under the valve cover there is another # which is 221

[SappySE107]

Those are the same heads I ported and they are the same bolt size as the rest of the heads I have been flowing. Are you sure the bolt is different and not just the bolt head?

[onefastV6]

Those are the same heads I ported and they are the same bolt size as the rest of the heads I have been flowing. Are you sure the bolt is different and not just the bolt head?

I am not sure on that at all, but I would like to find out. Maybe the next time I am up north I can stop by with the heads that I have.

Also when you are flowing the heads are you testing them at 28" of liquid? or what are you testing at?

[SappySE107]

28" water