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10sec.et
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Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Fri Apr 22, 2011 1:18 am    Post subject: Reply with quote

theres more to porting than size. just making the ports bigger doesnt necessarily improve flow. unfortunately, i have no specific experience with the heads you have so i cant really offer much help on porting. best thing (IMO) for you to do is research what has been done to your heads with success and attempt to duplicate the port work.
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Skunkworkx
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Joined: 02 Sep 2007
Posts: 352
Location: Harford Co. Maryland
10318.16 points


1968 Chevrolet Camaro

PostPosted: Fri Apr 22, 2011 7:17 pm    Post subject: Reply with quote

Those are some nice numbers Paul.
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68 Camaro LSx
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Fri Apr 22, 2011 8:24 pm    Post subject: Reply with quote

Here is a web site you guys need to bookmark.

http://users.erols.com/srweiss/tablehdc.htm

Most of the flow#s are from excellent porters.

The heads you have are a S/R= stock replacement and are fine for a bone stock 350 that see's south of 4500 most the time.

I will post in a while what I think your combo needs after looking at the cam specs.
You do realize that is backwards from what should be done? Wink
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Fri Apr 22, 2011 9:30 pm    Post subject: Reply with quote

Do you guys want to see how stupid it gets flow wise????
I want to see the velocitity probe #'s!!! Laughing Laughing

http://speedtalk.com/forum/viewtopic.php?f=1&t=25623&start=90

Had to edit because of spelling!!!!!!!! Laughing


Last edited by af2 on Fri Apr 22, 2011 9:37 pm; edited 1 time in total
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Fri Apr 22, 2011 9:35 pm    Post subject: Re: 406 Reply with quote

novaguy71 wrote:

296ah-8 comp cam


Do you have a real Comp#.

A Hour later and I find no such # Confused
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Skunkworkx
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Joined: 02 Sep 2007
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Location: Harford Co. Maryland
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1968 Chevrolet Camaro

PostPosted: Fri Apr 22, 2011 10:28 pm    Post subject: Reply with quote

286ah-8 236/244.523/518 108 hydraulic

This is what I went off of.

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af2
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1933 Willys Coupe

PostPosted: Fri Apr 22, 2011 11:32 pm    Post subject: Reply with quote

Skunkworkx wrote:
286ah-8 236/244.523/518 108 hydraulic

This is what I went off of.


I saw that.
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Sat Apr 23, 2011 12:00 am    Post subject: Reply with quote

FN glasses on guys!!!!!
The 296 is at 246/253@ .050!!! For a flat Hydro that is way more than a bunch!!! They say 3000-6800 and that will never happen unless you are revving in neutral.

I will tell you on the 2 motors I buildt( spelling) Laughing the Hydro is a lazy a$$ cam!

I would take a solid any day for the fact of the quick ramps and the extended rpm.

Before I even say the heads I would run I would like to see that cam back in Comps storage! Wink
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Sat Apr 23, 2011 12:19 am    Post subject: Reply with quote

I forgot to say I ran a guy that had a Chevelle with a Crower Hydro that he said was a 8000 rpm 360" engine and laughed to the bank after running him with my .030/.030 cammed 327 in my 2900 lb Vega. I shifted at 7800 with good springs.
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af2
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1933 Willys Coupe

PostPosted: Sat Apr 23, 2011 12:24 am    Post subject: Reply with quote

Sorry. I am on a roll!!!
Converter is getting sent!!! Shocked
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novaguy71
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Joined: 17 Apr 2011
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Location: millsboro, de
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PostPosted: Sun May 08, 2011 4:29 pm    Post subject: Reply with quote

I had a comp 300b-6 in it before this cam and I ended up swipping few lobes on it. I called comp cams and they said id make the most power with the 296h with the setup I have... does this cam not make sence to u??? I'm still learning on the performace end of engines
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Paul P
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Joined: 15 Aug 2002
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Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Mon May 09, 2011 1:04 pm    Post subject: Reply with quote

Other than more head flow, Compression and Cam. A N20 kit will get you there. Not much else to say.
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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Big Dave
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Joined: 04 Dec 2005
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Location: Tampa Florida
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PostPosted: Tue May 10, 2011 9:18 pm    Post subject: Reply with quote

Paul P wrote:
Decided to play with Excel and put my airflow numbers in a chart like the Profilers. Kind of interesting to look at that way.



Looks like those are realy good street heads as the rate of increase in cfm peaks and noses over at 0.450" of lift which will include 95 % of all the cam grinds in the catalog. Racing cams where you are lifting the valve 0.700-0.900 inches off the seat are relatively rare and most of them are custom grinds for racers who do not frequently share their cam specs.

There are very few as cast heads that flow well past 0.500" inch of lift; but then again hooking up a carbide bur to your three quarter horse M-3 quil drill press isn't the way to go either. It isn't the amount of metal removed but where that counts.

The best 23 degree port jobs are those that try and turn a 23 degree head into an 18 degree head and keep it's original exterior shape.

Big Dave
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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Wed May 11, 2011 10:47 pm    Post subject: Reply with quote

I'm putting the valve open a bit more than .400 lift Twisted Evil but yes in fact these with a street cam would make really good power too.

They did flow 284 on the exhaust with a tube.....

With this kind of area under the curve a race motor will breath very well also. I'll be shooting for low 10's

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Pro Fleetline
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Joined: 04 Jun 2011
Posts: 20

877.68 points



PostPosted: Sat Jun 04, 2011 3:40 am    Post subject: Reply with quote

Pro filers are awesome heads running a set of Chad Speiers 210
Pro-filers wow amazing lil head on my 406.
Heres my flow chart could have had them open up more and still can but i had them done to match my current engine combo! car has some Assss. amazing head


By profleetline at 2010-11-25
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