Well, I purchased Ferrea 2.02 1.60's a few days ago, and imidiately threw them in a set of stock heads to see the flow advantage and to map the changes, well, to my disappointment, they didn't do what I expected. I made some phone calls about this problem but to no avail, <img src="gr_sad.gif" border="0"> I felt as if I made a big mistake. After further testing in my S1 heads and my LS6 S2 heads. They just didn't seem to be working, but before I gave up on them I figured I would try one more time. I took a virgin port, installed the 2.02 and began the tedious chore of port mapping, I realized then that the bowl/runner was effected quite differently from previous map notes with the 2.02 in place than the usual stock valves that I have been accustomed to (sort of a different runner/bowl air twist motion) and began porting to my new mapped notes. Well what do you know! big numbers and a very nice sound comming from the flow bench, you can tell by ear how smooth the runners were flowing and I was kinda excited! Well, long story short, the runners have to be specifically ported for that valve size, they do not like the S1 configuration at all. I was under the assumption that you just throw them in and they work <img src="images/icons/confused.gif" border="0"> ..I was wrong. BTW the 1.60 exhaust Ferrea's kick major butt too. I have a set of Rev 2.05 valves comming to test with and see what they flow.

10.8 compression
Ferrea 2.02 - 1.60 stainless steel valves
Viton seals
Isky springs good up to .600 lift with Ti retainers.

CFM numbers on the intake.
.100 78
.200 154
.300 214
.400 261
.450 273
.500 282
.550 290
.600 294

These are prelim numbers but otherwise encouraging.

[ January 22, 2002: Message edited by: Joe Prince ]</p>

 

Sounds like some good R&D and info for the ls1 community.

Its good to hear some of what is involved with porting heads. Takes some of the mystery out of what's going on with ported heads.

Keep the info flowing.

 

<img src="gr_images/icons/cool.gif" border="0">

 

So what did you change to make the 2.02 work? The chamber or the bowl? Both? Did you work on the swirl dam? Would like info. Please.. <img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />

 

Those r VERY good numbers Joe.
Keep up the good work.

We all know how well your S1 Heads w/STOCK valves worked on my car.Good luck...

Your buddy
JS

 

[quote]Originally posted by 2000RATA:
<strong>So what did you change to make the 2.02 work? The chamber or the bowl? Both? Did you work on the swirl dam? Would like info. Please.. <img src="graemlins/gr_hail.gif" border="0" alt="[hail]" /> </strong><hr></blockquote>

2000R,
Just about everything has changed except the floor, still, there was very little runner work preformed. I found flow where I never knew there was anything meaningfull from past experience. No, the swirl vein is not removed, I just layed it down and made it favor the valve guide. The bowl bias side is sorta the same as my S1's but the filling side of the bowl has been agressivly ported until my velocity probe told me to stop. The roof has been raised quite a bit and effectively shrunk the injector cut out size. I shaved down the "lump" Boss for the spark plug just a bit and gave it just a little better contour radius and that yeilded 4 cfm from .400 up. Lots of work, and every change has to continuously be checked on the flowbench to make sure I am going in the right direction.

[ January 22, 2002: Message edited by: Joe Prince ]</p>

 

This sounds exciting. Do you offer any trade in incentives.....lol

Keep up the good work and keep us informed on how you make out.

 

Joe Prince thank you for the information. It's nice to see you still have time for chat. <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />

 

Yes that is real good information.. Finally someone wants to share..

 

One more thing I forgot to mention 2000RATA, this new runner design for the 2.02 likes the boss for the rocker bolt removed now. I have never removed them in the past with my S1's, it never really flowed any better without them, and now it does.

 

I wondered about that big bump in there. Thanks again.

Something else, did you have to replace the seat rings for hte 2.02 or the 1.6? I am thinking you can get the 2.02 on the stock seat but not the exhaust. Any info and where do you get seats if so?

[ January 22, 2002: Message edited by: 2000RATA ]</p>

 

I have had mixed emotions with removing the swirl out of the LS1 heads. I heard that the head was hollow under the swirl, so I never got to carried away while grinding in that spot. On a junk set of heads I decided to cut it out, and see what it would do, and the mid lift flow picked up!!! I used a pick and pushed down on hat spot in the port where the swirl was located, and I broke through!!! I have since decided that it is not worth 5 #'s to make the wall thin as a soda can!!! For a short period of time I was installing 2.02 intake valves in the stock seats...The positive was that it was cheap and the heads flowed very nicely. The negative being that you have to sink the valve job to get it where the valve job will flow good!!! This requires the use of shims when you install the rocker pedistols. I prefer aftermarket seats because I can reset the factory valve height, and get even more flow with an aftermarket contoured seat!!As far as cutting out the rocker bolt boss the heads did nothing but pick up flow, and they pick up MORE flow with the 2.02 versus the 2.055 or 2.08. With a 2.02 X 1.56(stock seats) valve in an LS1 head my best port to date was 308cfm @ .575 on the intake, by 220cfm @ .575 lift on the exhaust.

 

These flow numbers y'all are throwing around...

What bore size are y''all using?
What pressure are y'all using? 28"?


Thanks for sharing your findings.

 

Raugh, I have a 3.90 insert in my Super Flow and I always measure at 28" of water, these are corrected numbers by Flow com too. I am using the stock seats and they are plunge cut to my seat angles. I have made 304 cfm with the stock valves in the past, I just have to get the hang of these 2.02's and I'm sure my prelim numbers will come up. Although, I still haven't seen a large gain in power over 287 cfm yet IMHO. The intake manifold is the common denominator of max flow. I have seen better power figures in the past with higher flow avarages across the board rather than high peaks.

Oregon, I agree with you about not removing the swirl dam, I have purposly taken it down in the past just to see how much can be taken out and it dose get very thin.

[ January 23, 2002: Message edited by: Joe Prince ]</p>

 

[quote]Originally posted by Raughammer:
<strong>These flow numbers y'all are throwing around...

What bore size are y''all using?
What pressure are y'all using? 28"?


Thanks for sharing your findings.</strong><hr></blockquote>

And thanks for asking the question. I'm sitting here with my flow figures set at 25" and assuming these are at 28" multiplied by .945.... they look ordinary. <img src="gr_stretch.gif" border="0">

 

Someone has to release a good intake in plastic that can really be ported.Aluminum is is heat soak and IMO not worth that much over the LS6 intake.

I know Cartek is porting the LS6 intake w/good results.Its a shame another manufacture wont release a good intake in plastic?

Then we all could benifit

JS

 

Hey Joe, Are these vavles going to be in my heads? If u make any leaps in the CFM of the LS6 S2 will that be incorporated into my setup? I would like to have as much powah as possible. <img src="gr_grin.gif" border="0"> Thanks for continuing the research and not resting on you laurels. Keep up the good work.

 

Anyone have numbers documenting the effect of increased bore sizes on LS1 heads? For example, going from 3.90" to 4.10" on both stock valve heads and big valve heads.

 

Going from a 3.90 bore to a 4.10 bore increases flow about 20 numbers across the board...that's why all bore 382s make more power than stroker 383s.

[ January 23, 2002: Message edited by: Patrick G ]</p>

 

[quote]Originally posted by Oregon LS1:
<strong>.The negative being that you have to sink the valve job to get it where the valve job will flow good!!! This requires the use of shims when you install the rocker pedistols. </strong><hr></blockquote>

How much are we talking here? Sink them alot or a little? I know one valve can shroud the other but are we talking sinking them .050 or what? If you would be so kind. <img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />

Here is the question I really want to know, but I don't expect anyone to tell me. What seat angles are being used and what backcut angles are used on each valve? If you don't want to post here please e-mail me, I won't tell. <img src="graemlins/gr_angel.gif" border="0" alt="[angel]" /> I'm just trying to learn some things here for my own personal knowledge. Joe Prince? Oregan LS1?