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  1. #21
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    Default Re: I screwed up a head porting!!!!!

    Quote Originally Posted by Fivefingerdeathpunch View Post
    Hell on that part of the head, JB Weld would work mint.

    Shoot, I JB Welded a giant block off plate to a supercharger for covering the silencer ports years ago. It held up like a champ on the car.
    YEP

  2. #22
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    Default Re: I screwed up a head porting!!!!!

    Well I started lapping valves and I think I have an issue. Looks like I ground too far into the chamber. The exhaust seats were bad and took a lot of grinding. It doesn't seal all the time. I shut off the lights and use a flashlight behind the valve to see if light shines through. Well it does in certain positions. I'm going to try and post pics using google.

    https://goo.gl/photos/3nBjgTX6ms5ScEev8
    https://goo.gl/photos/rnieE3eJQ8DcvtL28
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  3. #23
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    Default Re: I screwed up a head porting!!!!!

    What do you think can be done with this? Valve job, new head or just leave it?
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  4. #24
    Killa Bee Scottydoggs's Avatar
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    Default Re: I screwed up a head porting!!!!!

    shop can change the valve seats and then do a valve job on the head.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  5. #25
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    Default Re: I screwed up a head porting!!!!!

    Crap. Never again will I port a head. All well looks like I will have to save up to have valve jobs on both heads.
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  6. #26
    GrandPrix Junkie spazzz's Avatar
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    Default Re: I screwed up a head porting!!!!!




  7. #27
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    Default Re: I screwed up a head porting!!!!!

    Thanks spazz!!! I couldn't figure that out on my iPhone.
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  8. #28
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    Default Re: I screwed up a head porting!!!!!

    SHIIIIIIIIIIIT


    My dumbass should have had my heads checked before I spent 20 hours porting. They are both cracked. I had my back up set checked and one head is cracked.

    https://photos.google.com/photo/AF1QipPEISvV3-_JRF2VrtOJMoS1awv3Wq6aQJjD3a4n

    https://photos.google.com/photo/AF1QipMdhoROh0aADpLqRCyBq8452zDfkn8YW58aH2L9

    https://photos.google.com/photo/AF1QipNDQQ3MSfciPKHOH2RDsuQ4pZNIbrjC6gkmdzwY
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  9. #29
    Killa Bee Scottydoggs's Avatar
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    Default Re: I screwed up a head porting!!!!!

    dead links.

    and that sucks. but look how much you learned, next set will come out better for sure.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  10. #30

  11. #31
    I live here. Below Average Joe's Avatar
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    Default Re: I screwed up a head porting!!!!!

    links are broken on my end
    Quote Originally Posted by Sven The Sexman View Post
    Bill had a major role in all of the Star Wars movies; he was the force.

  12. #32
    I live here. Below Average Joe's Avatar
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    Default Re: I screwed up a head porting!!!!!

    will l67 heads work?
    Quote Originally Posted by Sven The Sexman View Post
    Bill had a major role in all of the Star Wars movies; he was the force.

  13. #33
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    Default Re: I screwed up a head porting!!!!!

    I will probably just buy some already checked and cleaned ones and put them on. I don't want to keep buying heads from a junk yard and them be cracked also. 2 different sets of heads I had and 3 out of the 4 were cracked. I wonder if most are like this??
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  14. #34
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    Default Re: I screwed up a head porting!!!!!

    Im not sure if 67 heads will work or not. The second set of links work. I tried to post like Spazz does but screwed something up
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  15. #35
    Killa Bee Scottydoggs's Avatar
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    Default Re: I screwed up a head porting!!!!!




    thats a good crack. some will say to just run em, most are not a issue unless its huge and split wide open.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  16. #36
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    Default Re: I screwed up a head porting!!!!!

    Thanks for posting that Scottydoggs!! I was thinking about running them but just about all of the cylinders have them and the seats need to be reground which the guy at the shop said could make it worse. also with the natural heat expansion they will only get worse... Sucks I might just save up for the zzp ported ones already
    Last edited by rickisrad; 07-12-2017 at 06:46 PM.
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  17. #37
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    Default Re: I screwed up a head porting!!!!!

    Have any of you heard of this place?
    http://www.shop.headsonly.com/PONTIA...X-33-38-V6.htm
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  18. #38
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    Default Re: I screwed up a head porting!!!!!

    I have done a ton of research on this and I think I'm going to get a valve job on them ported heads and run them. It seems that virtually all the 3800 heads are or will crack in this area. I contacted the heads place in the link about being sure if I order them I don't receive ones with cracks in the same area. They replied we magnaflux the heads and we do not repair unnecessary cracks that will not affect performance of the head. So it seems to me that they know of this issue and cut the seats in those heads anyways. Any opinions before I take them back in?
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

  19. #39
    Donating Users brettstoner's Avatar
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    Default Re: I screwed up a head porting!!!!!

    I had 3 out of 4 heads with cracks in them. I told the local shop to run the best ones and do a valve job. That was a year and a half ago and so far no problems. I think as long as you are not overheating to expand and open up the crack you should be fine.
    04 GP GT- top swap, VS cam, 3.0 pulley, E85, headers, 60 injectors, TEP 3:29 trans, Racelogic Traction Control, ZZP dyno tuned, 300 hp daily driver.

  20. #40
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    Default Re: I screwed up a head porting!!!!!

    I'm dropping off the ported heads to get a valve job today. Ill just run them and wish for the best. I hope my port job doesn't affect performance negatively. :/
    2007 Grand Prix GT. Pacesetter headers, 1.8 roller rockers, CAI, HPTuned, 3.4pulley, TEP transmission, fuel pump and alt rewire, poly mounts/performance suspension, Impala front brakes drilled and slotted rotors.
    Past Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G.

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