Thread: 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

What do you think can be done with this? Valve job, new head or just leave it?

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

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.

Thanks spazz!!! I couldn't figure that out on my iPhone.

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

dead links.

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

https://lh3.googleusercontent.com/T5DZfnuUHQKdjFiSGl8Cu_nR0SHNocJFqLykjGwtdY3g6YLaRt Rw5ZOBsfA7KOkBrzC2Oe7wNGPRv--ul_4z-oRSaHRjxH8Z5oRJG7gKnWK90r3EY0f6FBnj58dcvmaZ1qFmZTN YvLKkYNB3NVaXpHsQcWHCAp9lp7QCmx99gw5gMXCUuCsZf--2-jjJvczTDDj2dBt5__xScXlf9A6neMba3r6PKjQ48-2m6sDtL6PZCuAeW_skBQK6Tanmosh5rQ3ehxJBkYe_sYXxyw9i mFQSpV4HKqJgwg-1RKURb5QGtMjq0sLRNyHuJMEULzJzPZPu0vec9uabwlLPe49AP RxyrmbUAlp-7hTzm0nclDZP3WOVmvI2UXtzPMPFj1VN6IRkVAs8MlOZa4i-mEAXrzKdKIDFt8Na2ETpCPbLqUGf2qm18V2bATTf0xb6A6wUU3 zw_rhbk5sZUA8KU5Fl6q2uDXDYNRR3Uj94UrhgPn2bJ3DnB5TE sRkJIh5hyp7ONHFgx6_QfzY3QIm4N2KLF9bTkQKCVW1IkoEDwv YtooN8TP_sD7V5qVYdKNOswAS94I4Ev2GZzYnDfVvs8bxTVjWw zgQqctn40SMM64IPOrDpo2sxaoUJi1Dl=w497-h662-no


https://photos.google.com/photo/AF1Q...NIbrjC6gkmdzwY

https://lh3.googleusercontent.com/v8...f=w497-h662-no

links are broken on my end

will l67 heads work?

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??

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

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

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

Have any of you heard of this place?
http://www.shop.headsonly.com/PONTIA...X-33-38-V6.htm

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?

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.

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. :/