This is with a 2.02 valve and my flow bech is dead on accurate. These are corrected numbers by flowcom and are "clayed" intake opening with a 3.90 bore insert.

.100 72
.200 150
.300 212
.400 253
.450 270
.500 280
.550 288
.565 291 = cam lift

Our "tuner" S2/2.02 heads flow a little better than these do. This example above have about 40 hours of labor in them.

Hope you like them Steve R! there yours.

<small>[ June 05, 2002, 02:09 PM: Message edited by: JPR ]</small>

 

Do you have exhaust numbers too? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

ERic

 

What do you mean by corrected? Are they adjusted for temperature and/or humidity? The flow from .200" to .400" looks very good. I use an SF-400 and was wondering if heads flowed at 70 deg F and 100 deg F would give the same result. It seems to me as temperature increases, air density decreases, which could affect the airflow reading.

Paul J.

 

Paul,
Flowcom takes the atmospheric conditions into consideration and gives me corrected numbers so you have the exact numbers all year round no matter what the shop temp is. It's all digital read out and it corrects on the fly. Now, if I can only get my printer to work. <img border="0" alt="[judgement]" title="" src="graemlins/gr_judge.gif" />
Joe.

 

Those numbers are almost the same as heads you did for Ragtop 99. </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Ragtop 99 My JPR S-1x heads with stock valve sizes flowed:

.450 - 268
.500 - 280
.550 - 290
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It's nice to see that you get consistant numbers porting by hand. You prove it's a skill and a person is better than a computer. Do you modify the swirl vein?

<small>[ June 06, 2002, 02:03 AM: Message edited by: 346cubes ]</small>

 

JPR's flow numbers appear to be dead on. I've logged months worth of flow bench time testing LS1 heads and although my flow bench is not a Superflow bench, I periodically check heads on my bench and against several local Superflow benches (with flowcom) and find results very, very close. I also use a 3.90" test bore to keep things honest.
I'm curious as to what brand valve your using and if you are backcutting them. <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
Thanks,
Richard

 

346 cubes,
These are Ragtops old S1x heads, the only moddification that was done to them was I removed my modded stock valves for a set of Ferrea 2.02 / 1.57 valves and it really brought up the low lift figures nicely. I have my own new cuts in the seats and valves for the 2.02's. I modd the swirl vein to retain some swirl control, but I do not remove them.

Headbam,
I try the best I can to have repeatable and consistant numbers from head to head and from port to port, I will agree, hand porting is extremly accurate, it just depends on the porter to dedicate themselfs to consistancy.

<small>[ June 06, 2002, 09:34 AM: Message edited by: JPR ]</small>

 

those #'s look real good. low and mid #;s are awsome

 

JPR
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">I modd the swirl vein to retain some swirl control, but I do not remove them. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Do you find it makes a difference in a S/2 application? What if any is the the swirl rate? If there is a difference under what driving conditions? Part throttle or WOT?

Swirl veins' are almost as perplexing as valve springs! <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> Why do some work and some not? <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

I have seen instances where some folks will swear the swirl veins are a key to an unlocked door, while others maintain that the veins are decorations to an already efficient port design. Your comments would be greatly appreciated. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Richard

 

Headbam,
I hate to speak in riddles, but I do alot! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> When I use words like "swirl control" and "modd the swirl vein a bit" I can't elaborate any more than that. Yes, the swirl vein IS a key to the LS based heads but there also has to be a "marriage" of flow vs swirl per position lift. And Tony, I do flow bench EVERY intake/exhaust runner before they leave my shop from a comment in your one Post, I know it wasn't aimed directly towards me, but it was directed towards the group of aftermarket porters and kind of presumptious. I develop runners on the flow bench, each intake runner sees the flow bench no less than 4 times a piece during this process. There is a way to remove the swirl vein completly and induce swirl from another location but those are trade secrets <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> Sorry I can't really answer your question.
Joe.

<small>[ June 08, 2002, 09:33 AM: Message edited by: JPR ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by wizkid:
<strong>Do you have exhaust numbers too? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

ERic</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">How about my question? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Eric

 

Eric,
My exhaust flow number are right up there with the top heads out there.
Joe.

 

JPR,
I didn't know Ferrea had a 1.57 ex valve. Did you cut down a 1.60 valve to 1.57?

Did you back the Ferrea or install them as received?