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How long has it been since the injectors and block replacement? I strongly suggest that you spray the tail pipe with water and soap to take the oil residue out. Once the oil is cleared the smoke can be lessen although the smoke is just normal for it's on the break in period.
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Testimonial: "thanks 4 the tip, it did make the smoking less."
What color is the smoke? White smoke would bee coolant leaking into the exhaust sign of internal coolant leak. White -blueish tinted smoke it the sign of an oil leak. Black smoke is the sign of too much fuel getting to engine. If the injectors were just replaced you may have one with a bad seal or it is not seated correctly.
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Could be worn valve guides or valve stem seals, you will see smoke on startup and sometimes on decel going downhill. Could also be injectors that are too large for your engine (rare).
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