Long story short I made too many horsetorques and the cam gear walked.
Finishing the rebuild now with stg 2 cam, de-lipped pistons and carrillos.
Motor had 261xxx mi on it and was in great shape otherwise.
Decided to bore 10 over even though it was not necessary for the amount of wear in the cylinders.
It’s a good thing I did, bc we found that #2 had a large amount of core shift.
For those who have not heard of this see pic below.
To correct this issue I had to sleeve #2.
The shift on the bore did not clean up until 60 over.
This is the original motor that the truck rolled out of the factory with in great condition.
It makes me wonder, as I have heard of a few higher hp obs’s crack the block around #2, if there was a bad run of castings from Mexico.
It was not something that could have been caught by an ID micrometer, as the bore itself was well within tolerance.
I feel good about my decision to sleeve it and I’m glad the issue was found.
Has anyone that bored their motors over, run into this before?
Finishing the rebuild now with stg 2 cam, de-lipped pistons and carrillos.
Motor had 261xxx mi on it and was in great shape otherwise.
Decided to bore 10 over even though it was not necessary for the amount of wear in the cylinders.
It’s a good thing I did, bc we found that #2 had a large amount of core shift.
For those who have not heard of this see pic below.
To correct this issue I had to sleeve #2.
The shift on the bore did not clean up until 60 over.
This is the original motor that the truck rolled out of the factory with in great condition.
It makes me wonder, as I have heard of a few higher hp obs’s crack the block around #2, if there was a bad run of castings from Mexico.
It was not something that could have been caught by an ID micrometer, as the bore itself was well within tolerance.
I feel good about my decision to sleeve it and I’m glad the issue was found.
Has anyone that bored their motors over, run into this before?
