Level 2 3100 and 3400 Ported Heads

[SappySE107]

Flow improvement of 11% over stock on the exhaust and 9% on the intake (average from .050 to .500). Mid lift is the bulk of these flow improvements though. Exhaust side is opened up a little more than level 1, while the intake side is the same volume. Combustion chamber rework really helped kick the intake flow up. I learned a bit from the 3500 heads and spent a great deal of time experimenting with the best shape vs compression loss from removing metal in the chamber. Pictures will be up in a bit after I resize. Here are the flow sheets.

Blue is stock, red is level 1, green is level 2. Exhaust are the first 2, Intake the second 2.






http://60degreev6.com/store/index.ph...d&productId=34

[SappySE107]

darn, I used the wrong intake port. Oh well, thats actually the worst flowing one out of the 6 i flowed. Meh, im just making up for everyone else showing their best I guess:P

[SappySE107]

Some pics. Exhaust pics didnt turn out like I wanted. Intake side is pretty dark as well but I included it for the heck of it. The rough texture on the intake makes it hard to really tell how they look. I prefer seeing with my fingers but thats pretty hard to upload:P

[john_V63400]

Im interested in these heads, whats the bare head charge. Does that mean if I send you my heads you will take 200 off.

[SappySE107]

No, bare heads are just ported with no other work done. You would need to have them finished up, as in making the block mating surface flat, valve job, valves, springs, retainers, locks, valve stem seals. I think I am going to just remove that though because I haven't had any interest in it and it wouldn't be possible for me to flow match or CC match properly either which has always been optioned on orders so far.

There is a core charge so if you want me to send a set of heads first and then you send yours back after you swap them off, you get your core charge money refunded (after they are pressure checked and inspected). So you get your core minus the pressure check costs. This way I can make sure the next owner of your stock heads is getting the same quality.

[95SleeperAcheiva]

Hey Ben,
You know I'm going to be picky!

The last pick of the intake side of the head...
the roof of the center port looks a bit rough! j/k

excellant work man! I'm curious, what's the grit of your finish polish? I was told that 120 should be used as the final to allow proper fuel atomization, if that's true, that means the heads are the only part that need it at 120. Then the intakes and TB could be polished to a mirror, right?

Next question, now that I have a 3400 '04, are they the same heads as a Gen 3 3.1 '95? Also, do you have flow to .550"? the cam I'm looking at from Crane has a .480" lift with 1.5 rockers, which means with a 1.6 rocker I'm looking at .512" lift. Should I even be concerned? Will that .480" cam from crane work in my 3400? (outside of the obvious need to flash the ECU)

I will be turbo charging, which brings me to the final question, do you have somebody that you trust to do the cc match and flow match?

[bszopi]

Crane cam won't work. Its for a GEN 2 engine.

Heads between the 04 and 95 are very different and the lower intake of the 04 will not align properly with the 95 heads, and vice versa.

[95SleeperAcheiva]

Thats NOT what I wanted to hear!!! Now how am I supposed to keep driving my car with you doing my heads, TB, lower intake, and the 3.5 upper intake? Huh? Why ain't you answering?! Oh ya, it's a post...

[SappySE107]

Its not much higher at .550 compared to .500. At .512 lift, the flow numbers up to .450 are all that really matter since its not at peak lift very long and the pressure difference between intake and CC is less than at lower lifts. Same with exhaust.

I use 120 grit though I haven't heard anything special about it. I turn the speed down on the grinder for hte final pass to give it some texture on the intake side. You could polish everything other than after the injector if you really wanted to on the intake side but you may as well get extrune hone if you want that kind of finish. Not cheap.

I do my own CC and flow matching.

[95SleeperAcheiva]

ok dumb question, one which I should know the answer...
What's "extrude hone?"

[SappySE107]

Its a process that involves clay and abrasives. Its pumped through a part and it leaves a smooth surface while also "porting" it out. Its great for manifolds but I wouldn't use it on heads.

[95SleeperAcheiva]

Would that be a way of porting the 3.4 DOHC upper? Not that I would I'm just thinking of the application. Or for that matter, how about the 3.5 square upper?

[SappySE107]

Yeah, thats the best way to port the DOHC upper and it wouldn't hurt most likely to have the lower done at the same time.

The 3500 plenum could be done this way as well but I think its pretty good with some porting. Id do a 3400 type plenum that way before Id bother with a 3500 plenum using that process. The cost is a lot for what you will get but if you want the best you gotta pay for it.

[IsaacHayes]

3500 upper is so simple as there no runners that extrude hone would be a waste of money that you could do by hand. The lower however is hard to see and get a bit all the way down the runner, so extrude hone would be easier/better in that case. I guess extrude hone would polish the casting roughness out of the 3500, but I'm not sure how much of an effect it has on air flow since there's no runners just the insides of the box plenum, and there isn't as much air speed there as it is when it exits the ports and goes into the lower.

I did notice on my 3400 lower that it's a really smooth cast. Not rough at all compared to the 3500 upper, other than the casting seam. Either they do this on purpose or it varies from the molds they use on intake to intake..?

It seems on several motors I've seen except for one non labeled 3400 upper, that the UIM (on 3x00 motors) is always a rough cast. Even the valve covers are super smooth compared to it. I'm guessing since there isn't usualy long runners there that it's not worth it to make a smooth cast/mold....