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l67 rebuild questions

I

ImpalaGTP

New member
so, I decided to freshen up the bottem end of the l67 while I had the motor out, and ran into a problem. cylinder 5 had some pitting, so I started honing it and I think I honed a little too much. I opened the bore up to 3.802 and its still pitted. does anyone know the piston to wall clearance on these motors? I was really hoping I wouldnt have to go oversized on this motor. thanks in advance I can't seem to find it anywhere.

btw its an o2 gtp with 180000 miles
 
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Yeah, These blocks just do not take kindly to machine work. They are too thin to really work on them.

Go to the junkyard, get a new engine and freshen the gaskets. Done.
 
pictures of cyl walls? I have never seen anything in the cyl walls that hurt anyone. If the crank/main/rod bearings are in good shape you should be able to reassemble the motor, if you are lucky. I would just let the stock pistons/rings ride it out at this point.. the hone hurt you but its probably not going to show any problems in reality.
 


darkhorizon said:
pictures of cyl walls? I have never seen anything in the cyl walls that hurt anyone. If the crank/main/rod bearings are in good shape you should be able to reassemble the motor, if you are lucky. I would just let the stock pistons/rings ride it out at this point.. the hone hurt you but its probably not going to show any problems in reality.
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I will try to get a picture here soon. I have new bearings and rings ready to go in. the rod bearings looked pretty bad but the mains looked great. I was hoping a quick hone would have knocked the pitting down enough.
 
You do plan on having the bottom end assembled at a machine shop after they align bore it right? If you don't then you will have a 200-mile miracle on your hands. These engines do NOT last if this is not done. You will end up spinning a bearing and then lower end will be trash.

Also, don't forget that the bolts are TTY and aren't reuseable (other than the crank balancer bolt). Good luck with your build.
 
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