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The cam bearing was already Bad. It already spun in the block which is why the cam journal was scoured on the cam as well as the bearing being thin and black.
The real question is, did it damage the block? The machine shop will have to measure and inspect it. Likely it will take a new set of bearings. but occasionally you can get one that damaged the block and will not clean up. These are not like a traditional small block where they can hone it it out either. If it's damaged to the point it won't hold a new bearing, the block is junk.
Originally Posted by smokeshow
You can get a ball hone and another set of bearings and hone it out to the next size up bearing. Only works if it's not position 1 or 5 but those ones aren't the ones that usually spin anyway.
Thank you guys for the replies. I'll be heading to the machine shop shortly and report back as soon as they find anything out.
If I'm gonna to use LS9 gaskets and the 317 heads how much do I need the heads milled down for 10-1 compression ratio? Or is that too high for 10+psi of boost on 93.
Machine shop got back with me today and said everything in the LQ4 looks good and can be returned to factory sized bearings. Also said crank, rods/pistons and heads look good.
So I'm having him clean everything up and install new bearings, polish the crank, clean up the heads and do a valve job as well as clean up the rods/pistons and new rings.
So my questions are what compression ratio should I run with about max boost out of the TVS1900 on pump 93?
What ring gap should I have? I've read .024/.026 is a bit looser than original from GM and should be good for boost.
More bad news the 317s are junk. After getting the valves out the machinist noticed cracks between the Intake and exhaust valves on every cylinder. Thing must have gotten nuclear hot at one point.
If they leak, they are bad. But Its such a costly repair to replace the seats and have them welded Vs. getting some new cores to start with.
That's pretty much what the machine shop told me.
I'm really thinking about ordering a set of PRC 220 CNC heads. Looking at a compression calculator with the gen 4 pistons PRC 220 heads and ls9 gaskets It should be just about 10-1 compression.
Think those heads will work well with my 212/218 cam and blower?
04-15-2019, 01:18 PM
