jeep.kevin
NAXJA Forum User
- Location
- Edwards AFB CA
**My question is in the first paragraph, read on if you want the full story.**
Ok, so my machinist just called me and said there is a chance that when he grinds the valve seats that they might hit a water jacket? any truth to this on a 7120 head? it was my understanding that the 7120 head had the best flow and was a good one to get.
I know the 0331 is pretty much trash for various issues attached to them. He said that on the past he has done 50+ jeep 4.0L heads and never had an issue, but recently he had three heads in a row with bad castings that exposed a water jacket when they ground for new press in valve seats. I asked if he had casting numbers for those, he said they were all 0331 heads.
If someone with some knowledge on this or experience with getting a head rebuild let me know what you've got. He is waiting for me to respond about to go forward with the machining or not.
Thanks,
-Kevin
Ok, so my machinist just called me and said there is a chance that when he grinds the valve seats that they might hit a water jacket? any truth to this on a 7120 head? it was my understanding that the 7120 head had the best flow and was a good one to get.
I know the 0331 is pretty much trash for various issues attached to them. He said that on the past he has done 50+ jeep 4.0L heads and never had an issue, but recently he had three heads in a row with bad castings that exposed a water jacket when they ground for new press in valve seats. I asked if he had casting numbers for those, he said they were all 0331 heads.
If someone with some knowledge on this or experience with getting a head rebuild let me know what you've got. He is waiting for me to respond about to go forward with the machining or not.
Thanks,
-Kevin