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HELP PLEASE: Head Porting info.
https://slantsix.org/forum/viewtopic.php?t=25303		 Page 1 of 2
Author:  mopardemon71 [ Wed Oct 10, 2007 1:36 pm ]
Post subject:  HELP PLEASE: Head Porting info.
I need to know if anyone has good solid info for head porting or is it a "grind untill it looks right?" type deal. My friend won't start with out some idea on how far he should go.

I asked about the aussie / 6 intake but no one replied so I guess that wasn't the best way to ask about the difference.
Author:  Doc [ Wed Oct 10, 2007 2:12 pm ]
Post subject: 
I recently wrote an article on SL6 head porting that published in the last SSRN newsletter. I will see if it is OK to reprint it here.
DD
Author:  Aggressive Ted [ Wed Oct 10, 2007 2:31 pm ]
Post subject: 
Need Help!

How about one for porting the exhaust intake/manifolds?
Would be helpful to see some pictures of one that has been done.

I need to take mine off this week and install the new Aussie carbon fiber gasket. Right now I have several manifold leaks that are getting worse.
I am down to 21.5 mpg gallon from 24.5 mpg due to a bad ROL gasket.
The head has already has been ported and gasket matched, but not the manifolds.

If I just gasket match the intake and exhaust, will I get into trouble with removing too much and cause cracking?

There are no pictures in the articles section.

Thanks,
Author:  mopardemon71 [ Wed Oct 10, 2007 4:25 pm ]
Post subject: 
Thanks Doc the biggest problem is thart the fel-pro gasket is the same size as the ports on the the head so that didn't work for me.
Author:  slantzilla [ Wed Oct 10, 2007 7:03 pm ]
Post subject: 
You really don't want to grind the ports much other than cleaning out casting goo. The real work is in the bowl area and chamber for the O/S valves. :D
Author:  rock [ Thu Oct 11, 2007 7:59 am ]
Post subject:  TEd, I ported one for the Aussie gasket and ooops!
Ted,

I don't know how to post pics here because I don't have a web hosting service that seems to be required to do so. BUT, lemme have your regular email to my PM and I will send you a great pic of just how far is too far. I worked for about 20 hours on the intake and exhaust ports to match them to the Aussie gasket. I was making them into a trumpet shape and slipped once and made a small bow outward at the edge. I was all done with the head, of course. THe slip made it open up the water jacket just like watching a black felt tip pen mark the inside of all my port. All that work wasted...but I assure you it is possible to port match to the Aussie gasket...I got it right the next time.

rock
'64d100
Author:  Aggressive Ted [ Thu Oct 11, 2007 9:11 am ]
Post subject: 
Rock,

I sent you a PM.
I hope you have a picture of the ported intake and exhaust manifolds. I am pulling mine off today Thursday, and need to have the car running again Friday. The cold weather really set in here next to the foothills.

Thanks,
Author:  mopardemon71 [ Thu Oct 11, 2007 5:05 pm ]
Post subject: 
Ted have you sent your car down the 1/4 mile yet?? Your set up is very similar to mine so I like to know how well you run.
Author:  Aggressive Ted [ Thu Oct 11, 2007 6:15 pm ]
Post subject: 
Mopardemon71,

No, not yet.......I have some leaks along the manifolds.
I had them surfaced when I did the rebuild, but the ROL gasket was no good.
I ordered the Aussie carbon fiber gasket but have not installed it yet. I wanted to do that today but, I was hoping somebody would reply to my post on port matching the manifolds, maybe send a picture, but after 70 hits, no response yet.

Even though there are some manifold leaks they fade when the power valve comes on and it roars to life. Then at cruise I get a lean surge.
As soon as someone gets back to me on porting the exhaust manifold, I will finish her up and be ready for the track. I will be glad to share the results. :)
Author:  rock [ Fri Oct 12, 2007 4:24 pm ]
Post subject:  Ted I sent you a set of pics, and
Hi Ted,

Actually if you read the thread you will see I posted a note first thing yesterday morning and told you I would send you a set of pics, and upon receiving your note with your email addres to my email, today I sent you a set of pics upon getting home. So it is not exactly right to say no one out of 70 responded. Also, I am in the normally in the position of having to work fa day job rather than work on slants all day and send pics intermittently. If your initial post had stated a time requirement in minutes or hours for the help, I would not have replied to start with knowing that I could only respond in a day. Tonite finds me just finishing a 30 hour shift beginning about lunch time yesterday when a meathead driller hit a 6 inch natural gas line and set a fire 150 tall in a 6 by 8 lane intersection here, and I had to do some of the fixing. As most of us here, as fast as possible is about all we can do. I can send other pics tool but I think those I sent make it clear where peril lies in #6 Ex. If you need some more, lemme know and if you have a time limit, tell me. Other than that, I wouldn't hesitate to grind away to Aussie size and did so on the next round.

rock
'64d100
Author:  Aggressive Ted [ Fri Oct 12, 2007 5:30 pm ]
Post subject: 
Rock,

Holly cats! talk about a mess....glad you alive and well!

I generally work 12 hour days myself, but wanted to get started Thursday night between rain storms.

Checked both emails at work and home for your email and pics, nothing so far.

Appreciate the pictures when they get here. I check emails and posts through out the day. I was just surprised out of all the guys (70 hits at that time, 99 now) you were the only one that has port matched their manifolds and was willing to share. I wasn't sure if the Aussie gasket was going to get me in trouble or not!

Thanks for your time and I appreciate the help. :)
Author:  Crazy Dart [ Fri Oct 12, 2007 6:31 pm ]
Post subject: 
Quote:
I recently wrote an article on SL6 head porting that published in the last SSRN newsletter. I will see if it is OK to reprint it here.
DD
Doc, if you cannot post here, what is the SSRN newsletter and where do I get a copy?
Author:  Doctor Dodge [ Fri Oct 12, 2007 8:50 pm ]
Post subject: 
SSRN issue #46 August 2007
Seymour Pedersen is the editor, his address is posted on the www.slantsix.org home page under thr Racing tab.
Author:  rock [ Sat Oct 13, 2007 6:13 am ]
Post subject:  Ted, here is a tiny URL to the pics
Ted,

Its cool man, I was tired and the note hit me wrong..but not enough wrong to rallty be put out at a fellow slanter! Just as you were trying to do some work in a weather crack, I wanted to also and the darn fire kept me from the first switch from the 90's to the 60's in 5 months. That is what really had me ill!

Our fellow forum member and a guy I have sure had good dealings with is Menko, who did me the FABULOUS favor or putting my pics on his whateve they call it, and sent me a tiny URL http://tinyurl.com/33p6wc

You will see I was basically done but final polishing then had the fatal urge to get what looked like a sand grain inside #6 Ex. My foot slipped a second, the burr moved laterally into the side of the port and gouged a dimple right into the water. I was hoping it was a dark line that was only another casting flaw so did a pressure test in the tank. That is why you will see a little rust about 1/4 inch down from the corner inside the port.

I truly agree it is worth more effort on pockest and chamber, but just wanted to do the gasket matching to some really big holes to see if I could. I am convinced you can, because I did it on the next time around, the head I just put on. you can't hardly beleive how much you can grind out of the ports if you are making them into trumpets, but I sure would do a practice one on a bad head first to see if #6 is closer than the rest to water. Most likely it is nearly random as to closeness given the casting variability, but I cut out almost 3/16, I SHOULD have been close to water!
Oh, there also is a pic of the 1.70 and 1.44 valves unshrouded.
rock
'64d100
Author:  Doctor Dodge [ Sat Oct 13, 2007 8:46 am ]
Post subject: 
A.T. PMed me about this and I explained my reason why I have not given much info. about porting factory manifolds, it's because I never spend much time doing that. Here are my reasons:

A factory 1 bbl intake has way more port volume and passage flow then the 1 bbl carb. The port opening is not a restriction.

For best fuel vaporization and suspension, it is nice to have the intake manifold ports / runners smaller then the head port and valve pocket, that keeps the volocity up thru the runners.

Having a "step" on the floor of the intake, where it meets a larger intake port at the head, helps get liquid fuel that is running along the manifold floor, back into suspension. The mis-match acts like a "ski jump".

With factory exhaust manifolds, spending more then 30 minutes on one is a waste of my time. Reach-in with a burr and knock-out any "rough stuff", then break the sharp edges at the port openings. Spend more of your time on resurfacing and doing a careful installation.

We all know that the factory exhaust manifolds are limited by the simple fact that all 6 exhaust 'pulses' have to make their way out one, 2 inch opening. We also know that it is highly likely that the factory exhaust manifold will warp, crack and break sometime during the life of the car so keep this in mind as you spend time on it.

If I were changing a manifold set (or gasket) I would look at installing the lighter aluminum intake manifold or at least use a 'large hot-spot' cast iron intake. For MPG, make sure thr heat valve is working.

Install the manifold set as high on the head as possible and use a large exhaust pipe (2 1/4 works well)
DD
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