as I figure out my flowbench software....

[SappySE107]

There is no intake connected to the head. Its a flowquik, so it calculates the depression and all that automatically. I noticed that as well on the 3400 intake, but it was the same across the board. I have a cylinder to mimic the bore of the block, so i know its setup properly for how it would be on the block.

Im not sure when ill be posting my ported numbers. I have yet to flow a head im currently porting, let alone practice with some spare heads to see what does what and where.

[SappySE107]

Wow, ok, the SIvalve for exhaust is considerably worse for flow than stock. Im going to go ahead and post the SIvalve valve flow numbers.

Exhaust

0.0500...25.0
0.1000...51.0
0.1500...72.6
0.2000...94.7
0.2500...114.1
0.3000...127.5
0.3500...133.8
0.4000...137.2
0.4500...141.1
0.5000...143.6

Intake

0.0500...45.9
0.1000...64.9
0.1500...88.5
0.2000...111.4
0.2500...134.7
0.3000...158.0
0.3500...178.5
0.4000...195.5
0.4500...207.9
0.5000...217.3
0.5500...223.5
0.6000...225.6

[torq455]

ben, are the SI valves undercut?

[SappySE107]

They are the proflow series. The stems are slightly smaller near the head, nothing to go crazy over. They really need a backside cut made on them. Ill have this done and tested. Right now im using a spare head to see what changes do what to flow. Slow process but at least ill have some understanding from a flow point of view. Flow isn't everything though, but hell, ill take all the information I can get right now.

[torq455]

there was a time I almost purchased thoes valves, glad i didn't

[SappySE107]

They raise compression, and with a little extra work they may prove to be very nice. In stock form though, no thanks.

[SappySE107]

All the 3400 numbers so far are wrong. My bench was pulling the valves in slightly, hence that bump you see. Guess its not in the head design. Oh the fun of posting up my learning experience:P

[Guest]

all of these flow numbers should not be taken as gospel but as an approximate of what they flow.

Something as simple as a good valve job can increase the flow dramatically without any porting done at all.

In order to get trully accurate numbers for each cylinder and head, a professional cleaning and valve job will need to be done to get accurate numbers.

Also something as simple as a change from a 3 angle to a 5 angle valve job will increase flow numbers. All that info needs to be given at time of the testing.

This is why I say dont' take this as gospel but as a reference.

When you tested the exh valve was it a brand new valve? Did it even have the seat angles cut in it? If not that will hurt flow like you saw.

I will say this though. I think its great you are doing this and have the bench setuip and software going strong. I have a stock 95 dohc head here with one int and exh ported and the rest stock. You will have to mock up a tool to open both valves at the same time and distance, but I would be willing to let you borrow it to get flow numbers so we have an approximation. Of course a good valve job will give more cfm but at least we would have an idea.

[SappySE107]

Ive got lots of heads here so testing is no problem. THe 3.1 head was professionally rebuilt with a 1 angle cut on the valve and a 3 angle valve job. The 3400 head is stock used. I want to get before and after valve job, as well as testing out different angles on the seat (i will not share some info as I run a business and I need advantages somewhere). I will give before and after results though. So yes, right now its just reference, though in time I hope to have quite a bit of data to share with everyone.

After I am done with the pushrod heads, I will be doing the DOHC heads. Im doing them last because 1, i dont have the valve device made and 2, its more motivation for me to do the pushrod heads. Its easier to learn on the pushrods anyway, and im obviously new to the flowbench thing. Ive got plenty of ideas though Lorenzo had me try that iron head fin on an aluminum head. Using clay I made a fin, and ended up trying a few variations of it. It didnt help anything in any of the shapes I tried but then again, I didn't try more than 4 at that time. Just giving an idea of what you can expect from me in terms of research

Oh, and I do offer flowtesting service, as posted in the 60V6 store section. 100 bucks for a set of heads to be flow tested. I think this is beyond cheap compared to other places, and it would help me buy more equipment. I need a TIG welder:P