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Thread: Head porting

  1. #1
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Head porting

    I took the top end off the motor for the omni and put it in the Daytona last week. I will need to come up with something for the Omni now.

    I've got a compressor which will keep up with my die grinder all day.

    I need the proper porting bits though. Where should I get the stuff?

    Any good tips on how to go about this?

    Where can I get my head flowed? How much will that cost? I'm thinking of doing a before and after to test the feasibility of doing my own work in the future. If it sucks there's no reason to do it again.

  2. #2
    turbo addict
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    Re: Head porting

    I cant answer you on the bits and where to buy.....but I have had a head flowed in the past. It cost about 40 bucks. I would just call around to local machine shops and see if they have a bench. Someone in your area should have one. If your works sucks the first time....you know what they say.....try, try and try again. Which is great in theory besides the whole 40 bucks a pop thing....

  3. #3
    Hybrid booster
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    Re: Head porting

    make sure you get a bit that is meant for aluminum, or else it will just pack up with aluminum and it will be ruined. the most critical area for flow is the area near the valve. focus on smoothing and blending the short side radius and blend the valve seat to the head casting, be carefull about increasing port cross section as it will hurt low end velocity and your car will suffer on the bottom end even thought its boosted. get a high quality 5 angle valve job and get backcut valves. dont polish the intake ports as it will hurt fuel suspension in the airstream. and the fuel will likely stick to the polished port wall. keep the intake ports semi rough with like a 80 grit sanding drum, this will promote fuel suspension in the airstream. if you like polish the exhaust side as the same issues dont exist. there are a couple books out there that touch on head porting. dont go too crazy, start conservative and go from there. good luck.

  4. #4
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Head porting

    Quote Originally Posted by 1FastCSX289 View Post
    I cant answer you on the bits and where to buy.....but I have had a head flowed in the past. It cost about 40 bucks. I would just call around to local machine shops and see if they have a bench. Someone in your area should have one. If your works sucks the first time....you know what they say.....try, try and try again. Which is great in theory besides the whole 40 bucks a pop thing....
    $40??? My heart...

  5. #5
    turbo addict
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    Re: Head porting

    Quote Originally Posted by cordes View Post
    $40??? My heart...
    I figured that would put you out of the game... Same problem for me. 40 dollars in real people money is like (as slasky would say) several hundred "Sean Campbell dollars".

  6. #6
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: Head porting

    Auto parts store should carry those, we have Princess Auto and as said, you want bits with wide flutes so they don't plug up.

    Port match then open up the runner to match as you go down, I like to take a bit off the floor to straighten the shot at the valve but that's a whole other argument, lol. Open up the bowl a bit, 90% of the valve size is max, then a nice 5 angle on the port and the stock angle on the valve with a 30 deg back cut. Again, up for arguments sake but I like to hog out the exhaust port.

    For a go no gauge, I used the ratchet end of a 1/2 extension, not entirely 100% accurate but it helped me keep them all close.
    Last edited by turbovanmanČ; 09-13-2010 at 09:27 PM. Reason: Edited throat size max percentage.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
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  7. #7
    boostaholic
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    Re: Head porting

    Here's a site that shows where NOT to cut too much.....http://www.pbase.com/rmscott/8v_782_head_cut_away Have fun.

  8. #8
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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  9. #9
    turbo addict
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    Re: Head porting

    I Know that a lot of people can choke on the $ sent on cutting burrs but these bits you will have for a long time and if taken care will last a long time .

    Take your time small cuts with the lowest speeds the grinder will give without chattering. and alway draw the bit into the metal with the rotation of the bit.

  10. #10
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: Head porting

    Quote Originally Posted by Aries_Turbo View Post
    Oh, pirate4x4, isn't that the home of the "wensel"?
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  11. #11
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: Head porting

    Quote Originally Posted by turbovanman View Post
    Oh, pirate4x4, isn't that the home of the "wensel"?
    IIRC Charlie Wensel was on there. Joey P was on TB.com.

  12. #12
    turbo addict
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    Re: Head porting

    Here is some(not all) pic of my porting tools

    I also recommend bright light if not pure day light.




    Believe it or not the home made flap grinder is the most used work horse.

  13. #13
    boostaholic
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    Re: Head porting

    Hey bakes, where did you get the long bits from?

  14. #14
    turbo addict
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    Re: Head porting

    I got them threw my snap on dealer but they are not snap on brand.

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