tapping when cold - Chevrolet Chevelle Forums

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tapping when cold

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03-02-2014, 11:33 AM

cjs67

Junior Member

Join Date: Jan 2014

Posts: 9

Thanks, I will check to see if I have an exhaust leak. Should I use an oil additive such as zddp which has more zinc and phosphate or something like the Valvoline 10w 30 racing oil. I put a conventional Valvoline 10w40 in at last oil change. This is the 1st big block older engine I have owned
Thanks

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