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There is a chance that your tapping noise is in your cylinder head. I overheated my car last summer to the point of cracking the head. My original head made no noise whatsoever @ 105k miles. So I bought a remanufactured head and it makes a tapping noise when its cold. Almost sounds like a car with a stuck lifter. I have read on here that there is something on these heads that can be shimmed to raise oil pressure and cut down on the noise. Other than that, my motor runs great now at 116k miles. I expect it to last much longer. Like to see 300k out of it.
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1987 Nissan Pulsar NX SE- CA16DE/5spd with screwy wiring under the hood.
1998 Triumph Daytona- 955cc of fun
1991- Kawasaki EX500 Ninja- The commuter
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