Port-Matching, do it yourself? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-08-2004, 06:20 PM
Sagacious's Avatar
Do you feel like we do?
 
Join Date: Mar 2004
Location: austin, TX
Age: 29
Posts: 122
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Port-Matching, do it yourself?

i want some nice 200cc heads for my 357, im thinking either Sportsman II or Dart Iron eagles. i see the flow #'s on the sportsman II's are better but but i dont know how much they are yet. anyway, i want to match the runner size on the heads to the intake manifold gasket. is doing it yourself advisable? i take it all you need to do is match the intake gasket on the head and get a magic marker to outline the areas that need to be shaved off. a simple grinding tool? also, i know you're not suppose to go farther than about a half an inch down. i have some junk heads to test on, but i was wondering if this is better left to a shop. thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-08-2004, 06:31 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Alot of first time do it yourself porters always want to grind around on the intake port opening, thinking that somehow horsepower will appear.

Actually, the intake port opening is one of the least restrictive areas of the intake port.

It's okay to use a gasket as a template, just as long as you don't grind all the way to the edge of the gasket. Removing metal right at the port opening, in front of the push rod pinch area actually decreases flow. Reducing the push rod pinch area increases it. You can grind away horsepower if you aren't careful.

If the intake manifold runner is smaller than the gasket and the intake opening on the head, your okay. If it's bigger, you are not.

I suggest you purchase a book on basic cylinder head porting, like one of Vizard's books. If you've never done it, I would do a little studying before you start grinding away on a 700 dollar set of heads.


Brian
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-09-2004, 12:42 AM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 37
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The heck with all that, just get the Motown IIs. They have the bigger intake valves, and bigger runners.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-09-2004, 04:52 AM
Member
 

Last journal entry: JB's 37 Pickup
Last photo:
Join Date: Oct 2002
Location: Smoky Mountains
Age: 76
Posts: 2,358
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Some of the good after market heads warn against doing any thing to their ports because reduced performance will be experienced. CNC heads are a thing of beauty and most have peen perfected so you can only mess them up. The gasket is there to seal and the only matching I would want to do would be to remove any gasket material that may be blocking the port opening..

Trees
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-09-2004, 06:44 AM
1BAD80's Avatar
The Smell of Nitro in the morn
 
Last wiki edit: How to adjust valves Last photo:
Join Date: Jun 2001
Location: Mich
Posts: 2,423
Wiki Edits: 2

Thanks: 0
Thanked 3 Times in 2 Posts
The best thing you can do is port match the gaskets, which is the easiest to do, and is needed on most heads to intakes & headers.

http://www.chevyhiperformance.com/te...518/index.html
__________________
Luv the smell of NITRO in the morning.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-09-2004, 08:13 AM
Sagacious's Avatar
Do you feel like we do?
 
Join Date: Mar 2004
Location: austin, TX
Age: 29
Posts: 122
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
motown II's

motown II's are nice but thats way too large for my application. i mean how/why would i go bigger than 200cc? motown II's are 220cc starting for 383's and up. i cant find a pair of sportsman II heads with manley pro flow racing valves for less than $749 each. anyone have any better resources?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-09-2004, 08:21 AM
camaroman7d's Avatar
Member
 
Last photo:
Join Date: Dec 2003
Location: Vacaville, California
Age: 47
Posts: 2,245
Wiki Edits: 0

Thanks: 3
Thanked 9 Times in 9 Posts
200cc heads are already on the LARGE side for a 350 (357).

Gasket matching is simple and if you have a steady hand and the proper tools you can do it. I would not suggest using a magic marker, I prefer to scribe a line. As mentioned above don't get carried away.

If you are going to do the heads make sure you match the intake manifold as well or you are kind of wasting time (IMO). I am a firm believer in gasket matching, as long as it's done right. The port mis-match that you get with some combinations is pretty bad. Find a gasket that is just big enough to take care of the issue.

Royce
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-09-2004, 08:22 AM
coldknock's Avatar
Member
 
Last photo:
Join Date: Feb 2004
Location: Social Circle, Ga.
Age: 42
Posts: 1,528
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Drag strips, car shows and e-bay. I just bought a set of Sportsman II's for $450 bare from a fellow racer. Be patient.

Larry
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 11-09-2004, 08:29 PM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 37
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I got mine in a trade for $300, + an old carb.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 07:52 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.