Fresh rebuild with new crank kit and bearings. Used plastigage, assy. lube and correct torque (in steps). No smoke, starts and runs well/normally until I accelerate and then back off of it at which time it rattles briefly...also does it briefly after I shut off the engine (very noticeable, fairly certain it's the engine and not an exhaust or other rattle issue). Head only has 10k. All timing correct including timing marks/belt. New oil pump(plenty of oil at head). Any ideas?
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