Quote:
Originally Posted by bird72
So THX to a great member here for a crank. Local machinist just did complete diagnosis that explained motor history. Bottom end was built 20+ yrs ago.
Bad align bore when 4 bolt caps added then.
Bad piston clearance ring to bore.
Result very bad crank scarring one spot and scuffed forged pistons. I used a Chevy racer machine shop guy in Oregon. Bonehead errors. Bad move I guess. I did hammer on that engine.
Good news is Matt's HO heads reported as "very nice".
Very happy with my machinists diligence. Block off to be align bored properly.
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>> One thing to keep in mind that usually is NOT in the mind of a machinist is that when the Align bore takes place,( Its NOT a Chevy) The crank is often placed "higher" in the block, which isnt a big deal if you run a ROPE SEAL. If you run a IA 2 piece seal you should make SURE some work is done to Ensure the rough cast Seal grove is concentric to the crank. I have been down this road a couple times and had perfect running engines PISS out the rear main...Just a friendly heads up
Good luck!!