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426 head porting
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Peterson View Drop Down
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Joined: 05 Mar 2011
Location: Westboro, Wi
Points: 862 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Peterson Quote  Post ReplyReply Direct Link To This Post Topic: 426 head porting
    Posted: 26 Feb 2016 at 7:55am
Ok guys, goin to start porting and polishing my 426 head soon. How far can a guy go in the ports? Any spots to watch for so I dont hit water? Any other suggestions would be great!! Thanks!!!
7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2
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Big Orange View Drop Down
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Joined: 11 Sep 2009
Points: 313 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Big Orange Quote  Post ReplyReply Direct Link To This Post Posted: 27 Feb 2016 at 1:39am
The area in the ports just behind the intake valve can be opened up & polished a little, but don't go crazy. Don't mess with the chamfer or the area around the valve on the head face, As that can mess up the swirl. polish the rest of the ports, intake & exhaust. installing rocker arms with a ratio of 1.75:1 will do a lot for the performance, plus some stronger valve springs & push rods. check the piston to valve clearance. for more low rpm, torque advance the cam, 3 or 4 degrees.     GOOD LUCK  
  
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Joined: 28 Feb 2013
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Points: 7935 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NEVER green Quote  Post ReplyReply Direct Link To This Post Posted: 28 Feb 2016 at 9:49am

  With respect Big Orange, I disagree on leaving the swirl notch on the intake face untouched. If you look on either side of notch there is a sharp edge of metal obstructing air flow, shrouding the valve, as designed only quarter of valve flows well.
2-8050 1-7080 6080 D-19 modelE & A 7040   R50       
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Joined: 28 Feb 2013
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Points: 7935 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NEVER green Quote  Post ReplyReply Direct Link To This Post Posted: 28 Feb 2016 at 10:39am


  Tyler, I purchased a head from from a guy named Max where he opened up the bowls above the intake valves, lots of material to remove and polished both ports.  He also cut off the guides that protrude into ports. Took head to flow bench, intake hit 180 at 500 lift after that didnt gain, exhaust hit 200 at 550 and was still climbing.
 To me the intake port is too small and in the middle of port it narrows, a big no no.             I have since opened up the ports middle and the roof making it taller and some what squaring it, never touched floor of the port, thats where the art of it comes in and need more research or leave it to expert.
  Didnt take back to flow bench but bolted head on and had gain in power fellow pullers and well traveled announcer noticed.
  Could try and post picture of ports if you like.
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Peterson View Drop Down
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Points: 862 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Peterson Quote  Post ReplyReply Direct Link To This Post Posted: 28 Feb 2016 at 11:21am
Yes please post pictures!!!!! They always help!!!!
7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2
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Joined: 28 Feb 2013
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Stock intake port
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Points: 7935 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NEVER green Quote  Post ReplyReply Direct Link To This Post Posted: 28 Feb 2016 at 12:30pm
Not too harsh boys, this is my first head porting job, not exact same port.
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Originally posted by NEVER green NEVER green wrote:

Not too harsh boys, this is my first head porting job, not exact same port.


 Stupid shadow to left of port.
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Big Orange View Drop Down
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To much porting & polishing will increase volume of air flow & decrease the speed of the air at a lower flow rate. So that means it will increase the HP at higher RPMs & decrease the power  or torque at lower RPMs. HP takes you down the track faster, but if you don't have the torque or power to finish the pull, you don't win. It takes a combination of HP & Torque to win. The speed the intake & exhaust valves open & close is very important, the easiest way to do this is install 1.75:1 rocker arms to replace the stock ones at a 1.48:1. alone with stronger valve springs & pushrods, advance the cam timing with a offset key, up to a max of 10 degrees. check the valve to piston clearance after you do this, retard the pump timing to about 25 degrees. Don't go crazy on RPMs, Pour the fuel & air to it & win some pulls!!!!       GOOD LUCK
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Peterson View Drop Down
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I have cut pistons already, so thats takin care of. Have a set of beehive springs already with retainers and locks to match. Need a set of pushrods yet. Planning on a set from Ed.

Thanks for all the info guys! It really helps. And is REALLY APPRECIATED!!!!
7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2
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Big Orange View Drop Down
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Joined: 11 Sep 2009
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Can Ed supply the rocker arms also? 
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Peterson View Drop Down
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Not sure. Was thinking perhaps kennys pulling parts.
7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2
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Joined: 13 Sep 2009
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Points: 4984 		Post Options Post Options   Thanks (0) Thanks(0)   Quote injpumpEd Quote  Post ReplyReply Direct Link To This Post Posted: 28 Feb 2016 at 7:57pm
Rocker arms I bought are from Murphys. You can deal directly with them.
210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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What classes are you guys running with these heads??
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Points: 7935 		Post Options Post Options   Thanks (0) Thanks(0)   Quote NEVER green Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2016 at 12:09pm

  Dont know about Tyler, I will be running in farm stock, basically too hot to farm.
2-8050 1-7080 6080 D-19 modelE & A 7040   R50       
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farmtoybuilder View Drop Down
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Porting is Something I would let the Experts do!
5 different TT-10's,5 TT-18's Terra Tigers,B-10,2 B-207's,B-110,2 B-112's,HB-112,B-210,B-212,HB212,2 Scamp's & Homilite T-10. Still hunting NICE HB-112 & anything Terra Tiger & Trailers for them.   
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Peterson View Drop Down
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Joined: 05 Mar 2011
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Points: 862 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Peterson Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2016 at 3:21pm
Originally posted by NEVER green NEVER green wrote:




  Dont know about Tyler, I will be running in farm stock, basically too hot to farm.


Pretty much same here.
7095-685I at 255hp, 8070-225HP,8050-210Hp,8030 with 155HP,220 with 670T engine with A-pump, 7580, 185 with 140HP, 2-6080's,6070, S4 D17,wd45,CA,st34 agco, S1 D17 with 3500MK2
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