From your description (excessive blow-by on newly rebuilt engine), some possible causes are:
1. Cylinders bored out of round or too large for pistons
2. Improper cylinder honing
3. Idling during break-in, especially during initial period
4. Piston ring quality
5. Piston ring install errors
Please describe your break-in process.
Piston/ring brand?
What does the machine shop say?
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1985 744 gle d24t
1985 745 gle d24t
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